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XIX.—On the Minute Structure of the Eye in certain Cymothoidæ

Published online by Cambridge University Press:  06 July 2012

Frank E. Beddard
Frank E. Beddard
Affiliation:
Prosector to the Zoological Society, and Lecturer on Biology atGuy's Hospital.
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Extract

The structure of the eye in Isopods has been less studied than in any other group of Arthropods; the only modern descriptions of the minute anatomy of the eye in these crustaceans known to me are by Grenacher of Porcellio, by Bullar of Cymothoa, by Bellonci of Sphæroma, by myself of the genus Serolis. I have lately had the opportunity, while engaged upon my Report upon the “Challenger” Isopoda, of investigating the eye in several species of Æga and allied genera. The structure of the eye in these Isopods differs very materially from the descriptions given by Grenacher and Bullar, but agrees very closely with the structure of the eye in Serolis.

Type
Research Article
Information
Earth and Environmental Science Transactions of The Royal Society of Edinburgh , Volume 33 , Issue 2 , April 1888 , pp. 443 - 452
Copyright
Copyright © Royal Society of Edinburgh 1888

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References

page 443 note * Sehorgan d. Arthropoden, Göttingen.

page 443 note ‡ Atti. r. Acad. Lincei., 1879.

page 443 note † Phil. Trans., 1878.

page 443 note § Report on the Isopoda collected during the voyage of H.M.S. “Challenger,” Zool., Chall. Exp., Pt. xxiii.Google Scholar

page 444 note * Loc. cit., p. 513, pl. 46, fig 13.

page 444 note † Carrière, loc. cit., p. 161, fig. 124, rh.

page 444 note ‡ Loc. cit, p. 20 et seq. pl. ix.

page 445 note * Quart. Jour. Micr. Sci., vol. xxiii. (1883)Google Scholar.

page 445 note † Mitth. a. d. Zool. Stat. zu Neapel, Bd. vi. (1886), p. 542Google Scholar.

page 446 note * Quart. Jour. After. Sci., Oct. 1886.

page 447 note * Cf. also Bullar's paper quoted above (pl. 46, fig. 12).

page 447 note † Mentioned also in Balfour's, Comparative Embryology, vol. ii. p. 396;Google Scholar see also carrière, Sehorgan der Thiere, 1885, p. 158, where they are figured and described in Gammarus pulex.

page 448 note * Loc. cit., pl. ix. figs. 3, 4, 5.

page 449 note * Grenacher has not noted the presence of special pigmented cells within the ommateum of Isopods. In Serolis there are two or three rows of such cells surrounding each element of the eye; the cells themselves are not easily to be made out, but their nuclei are particularly distinct in teased preparations, when the pigment has been dissolved away by nitric acid. I am not certain as to the exact number of these nuclei in each element; the action of the nitric acid is such that the cells, of which these are the nuclei, are not merely depigmented, but are entirely dissolved away. I could never discover any traces of the cell protoplasm in such preparations; although these nuclei often appear on a superficial inspection to lie in the retinula cells, carefuloe u ssing shows that this is not the case; moreover, the nuclei themselves are smaller than, and in other respects different from, the nuclei of the retinal cells.

page 451 note * Figured by Carrière, loa. cit., p. 31, figs. 26, 26a.