ORGANS OF VIS JON. 503 



able sea-slugs, Onchidium, discovered by Semper, their number 

 and position being most variable, even in individuals of the 



232. CARRIERS, J., 'On the Eyes of some Invertebrata.' Quart. Journ. 

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233. LOWNE, B. T., ' On the Compound Vision and the Morphology of 

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234. SCHIMKEWITSCH, M. W., ' Etude sur 1'Anatomie de 1'Epeire.' Ann. 

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235. EXNER, S., 'Ein Mikro-Refractometer.' Archiv. f. Micr. Anat., 



Bd. xxv., 1885. 



236. CARRIERE,}., 'Die Sehorgane der Thieve vergleichend-anatomisch 

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237. HlCKSON, S. J., 'The Eye and Optic Tract of Insects.' Quart. Joum. 

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238. EXNER, S., ' Ueber Cylinder welche optische Bilder entwerfen.' 

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239 PATTEN, W., ' Eyes of Molluscs and Arthropods.' Mittheilung. a. d. 

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(Gives an extensive bibliography from 1795 to l $%5i w 'i tn eighty-six 

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240. Locv, W. A., ' Observations on the Development of Agelena nasvia.' 



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. Wurzburg, p. 51, 1887. 



243. PLATEAU, F., ' Recherches expe"rimentales sur la Vision chez les 

 Arthropodes.' i., ii. and iii. Bull. d. 1'Acad. Roy. de Belgique, 3rd 

 ser., tomes xiv. and xv., 1887-88; and iv. Mem. couronne"s et autres, 

 Acad. Roy. de Belgique, torn, 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. 

 xcviii., 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. LOWNE, B. T., ' On the Structure of the Retina of the Blow-fly.' 

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247. SZCZAWINSKA, W., ' Contribution a 1'Etude des yeux de quelques 

 Crustaces et Recherches expeVimentales ur les mouvements du 

 pigment granuleux et des cellules pigmentaires sous 1'influence de 

 la lumiere et de 1'obscurite dans les yeux des Crustaces et des 

 Arachnides.' Archiv. de Biologic, Gand, torn, x., 1890. 



