There is one marked difference in the descriptions of the Carboniferous floral succession that have been furnished by Kidston and Potonié. Kidston emphasizes the existence of an abrupt change of flora at some point within the British Millstone Grit; while Potonié claims that he can demonstrate floral continuity right across the corresponding position in Upper Silesia (U.S. of Fig. 1, p. 58). Recent work by Renier seems to show that Potonié's results apply also in Belgium.

Material—The six more or less complete specimens and twelve fragments to be described are preserved in a coarse ferruginous sandstone. They were collected by Messrs. C. Barrington Brown and R. A. Baldry, who supply the following particulars of horizon and locality, and to whom the author is indebted for the opportunity of describing this interesting echinoid.

Since writing the first report on the arthropods of the Rhynie Chert beds (see Ann. Mag. Nat. Hist. (9), xii, pp. 455–74, 5 pls., and 13 text-figs.) some additional specimens of Palaeocharinus have been collected. A few examples are fairly complete and well preserved, showing a considerable amount of structural detail, such as the chaetotaxy, claws of the legs, ornamentation of the chitin, eyes, etc. An account of the lateral eyes is given below. We also include notes on a supposed insect and another fossil arthropod which we refer with doubt to the aquatic Merostoma. All the illustrations in this little paper have been drawn by Miss Violet Borrow, A.R.C.A., with the aid of a camera lucida under our personal supervision.

The purpose of this note is to place on record the occurrence of the soda-bearing amphibole, riebeckite, in a particular type of dyke-rock in the Shetland Islands. To explain its field-relations a brief sketch of the general geology of the group is necessary.

Ammonites are comparatively common in the Cenomanian or Lower Chalk, become rarer in the Turonian or Middle Chalk, and are very scarce in the Upper Chalk. On a former occasion, when pointing out that while ammonites were unknown from the Micraster cor-testudinarium Chalk of England, they occurred in the same Chalk in the north of France, the writer was inclined to attribute this absence or scarcity to limited horizontal distribution of the ammonites. The possibility, however, of there being gaps in the Chalk succession, for example at the horizon of Actinocamax plena, at the Chalk-Rock, in and above the cor-anguinum zone, etc., cannot be denied. The zone of Micraster cor-anguinum is not quite so barren as the zone below, but the only ammonites hitherto known from it are doubtful examples, probably referable to Parapuzosia. One impression, on an oyster, of part of the ventral area of a large specimen, possibly of P. corbarica Grossouvre sp., was collected by Mr. Dibley in the London-Portland Pit at Northfleet, Kent, and Dr. Rowe recorded probably comparable Parapuzosia (“ammonites of the leptophyllus group”) from Dorset and Yorkshire.

West of the marine Jurassic rocks near Mombasa the Uganda Railway traverses for 46 miles a belt of sandstones and shales which are grouped together as the Duruma Sandstone. The few fossils hitherto obtained from this series have not given any definite evidence as to its age, which is, however, shown by the relations of the sandstones to the Kambe Limestone to be pre-Bathonian. The Mazeras Sandstone, one of the upper members, contains many trunks of Dadoxylon, the age of which, according to Professor Seward, may be anything from Trias to Kainozoic. An Estheriella and some plants were found in the Maji ya Chumvi beds by Maufe and have been regarded as either Permian or Triassic. The lowest division, the Taru Grit, has not yet yielded any certain fossil, but it has been regarded as continuous with the shales in the Sabaki Valley, which yielded the Permian mollusc, Paleanodonta fischeri, and with the plant bearing Tanga beds in the north-eastern corner of Tanganyika Territory. A bore in quest of water was made near Samburu Station to the depth of 527 feet in the Taru Grits. The cores are preserved by the Uganda Railway at Nairobi, and Mr. David Harris recently re-examined them and made the useful discovery of two fragments of fossil plants. They have been kindly sent to me by Dr. A. W. Rogers and examined by Professor A. C. Seward. He identifies them as a Voltzia and an Ullmania. For the drawings, Fig. 1, I am indebted to Mr. L. D. Currie. Both fossils are specifically indeterminable, but Professor Seward states that they certainly belong to the flora collected by Dr. Teale in the Tanga beds, which was described in 1922. Professor Seward assigns that flora to an age between the Upper Permian and the Rhaetic, and seems inclined to regard it as probably Trias.

Included in a large assemblage of corals from the Lower Carboniferous Shales—referred to a Z horizon—overlying the Lower Carboniferous Sandstone anticline (K) on the north coast of Co. Sligo is a remarkable new genus—Caenophyllum—which forms the subject of this paper. Caenophyllum gen. nov. claims distinction in showing a very unusual life-history—quite unlike that of any known coral; and forms a very interesting example of abnormal coral ontogeny. The shales form cliffs at Pollarone, near Dromore West, Co. Sligo, and vary in height from 30 to 50 feet. They are cut off by the rising tide, and consequently have hitherto been neglected; but are of great importance in zonal work, as they contain a rich coral and Bryozoan fauna and thus form a starting point for zonal investigation.