ORGANS OF VISION. 503 
able sea-slugs, Onchidium, discovered by Semper, their number 
and position being most variable, even in individuals of the 
232. CARRIERE, J., ‘On the Eyes of some Invertebrata.’ Quart. Journ. 
of Micros. Sc., vol. xxiv., 1884. 
233. Lownk, B. T., ‘On the Compound Vision and the Morphology of 
the Eye in Insects,” Trans. Linn. Soc. 2nd ser. Zool., vol. ii., 
1884. : 
234, SCHIMKEWITSCH, M. W., ‘Etude sur ’Anatomie de l'Epeire.”’ Ann. 
Sc. Nat., Zool., sér. vi., tom. xvii., 1884. 
235. EXNER, S., ‘Ein Mikro-Refractometer.’ Archiv. f. Micr. Anat., 
Bd. xxv., 1885. 
236. CARRIERE, J., ‘Die Sehorgane der Thiere vergleichend-anatomisch 
dargestellt.”” Munchen u. Leipzig, 1885. 
237. HICKSON, S. J.,‘The Eye and Optic Tract of Insects.’ Quart. Journ. 
Micros. Sc., vol. xxv., 1885. 
238. EXNER, S., ‘Ueber Cylinder welche optische Bilder entwerfen’ 
Archiv. Phy. Pfliiger, Bd. xxxviii., 1886. 
239 PATTEN, W., ‘Eyes of Molluscs and Arthropods” Mittheilung. a. d. 
Zool. Stat. zu Neapel, Bd. vi., 1886; also in Journ. of Morphology, 
vol. i., Boston, 1887. 
(Gives an extensive bibliography from 1795 to 1885, with eighty-six 
references to the literature of the eyes of Molluscs, Arthropods, etc.) 
240. Locy, W. A., ‘Observations on the Development of Agelena nevia.’ 
Bull. Mus. of Comp. Zool., Harvard Coll., vol. xii., 1886. 
241, MARK, E. L., ‘Simple Eyes of Arthropods.’ Bull. Mus. Comp. Zool., 
Harvard Coll. vol. xiii., 1887. 
242, KOLLIKER, A., ‘ Ueber das Zirbel-oder Scheitelauge.’ Sitzungbericht 
d. Physik. Med. Gesellschaft z. Wiirzburg, p. 51, 1887. 
243. PLATEAU, F., ‘ Recherches expérimentales sur la Vision chez les 
Arthropodes.’ i., ii. and iii. Bull. d. PAcad. Roy. de Belgique, 3rd 
sér., tomes xiv. and xv., 1887-88; and iv. Mém. couronnés et autres, 
Acad. Roy. de Belgique, tom. xliii., 1888. 
244, EXNER, S., ‘Durch Licht bedingte Verschiebungen des Pigmentes 
in Insectenauge und deren physiologische Bedeutung.’ Sitzungb. d. 
K. Acad. d. Wissenschaft in Wien, Math. Naturw. Classe, Bd. 
xevili., Abth. iii., 1889. 
245, EXNER, S:, ‘Das Netzhautbild des Insectenauges.’ Sitzungb. d. K. 
Acad. d. W. in Wien, Math. Naturw. Classe, Bd. xcviii., Abth. iii., 
1889. Repertorium der Physik. Bd. xxv., pp. 540-561, 621-641, 1880. 
246. Lownr, B. T., ‘On the Structure of the Retina of the Blow-fly.’ 
Journ. Linn. Soc. Zool., vol. xx., 1889. 
247. Szczawinska, W., ‘Contribution & Etude des yeux de quelques 
Crustacés et Recherches expérimentales sur les mouvements du 
pigment granuleux et des cellules pigmentaires sous l'influence de 
la lumiére et de l’obscurité dans les yeux des Crustacés et des 
Arachnides.’ Archiv. de Biologie, Gand, tom. x., 1890. 
