LIST OF ILLUSTRATIONS. XV11 



FIG. PACK 



224. Nudibranch (Dcvdronotits arborescens), showing dorsal out- 



growths forming adaptive gills .... 



225. Ventral surface of Patella vulgata after Forbes and Hanley 



226. Chiton after Pretre ..... 



227. Dorsal view of nervous system of Chiton after Pelseneer . 



228. Anatomy of Chiton ...... 



229. A Pteropod ( Cymbulia peronii], showing the wing-like ex- 



pansions (pteropodial lobes) of the mid-foot 



230. Stages in molluscan development .... 



231. Proneomenia. Nervous system from Hubrecht . 



232. Section of shell of Nautilus after Lendenfeld . 



233. The Pearly Nautilus (Nautilus pompilius] after Owen 



234. Male of Balanoglossiis (Dolichoglossus) kowalevskii after 



Bateson. ...... 



235. Transverse section through gill-slit region of Ptychodera 



minuta after Spengel ..... 



236. Direct development of Dolichoglossus after Bateson 



237. Tornaria larva, from the side after Spengel 



238. Piece of a colony of Cephalodiscus, showing the tubes in- 



habited by the animals after Ridewood 



239. An individual Cephalodiscus after Ridewood 



240. Dissection of Ascidian after Herdman 



241. Diagram of Ascidian after Herdman 



242. Young embryo of Ascidian (Clavelina)2&\.vc. Van Beneden 



and Julin ...... 



243. Embryo of Clavelina modified after Seeliger 



244. " Nurse " of Doliolum miilleri after Uljanin 



245. Sexual individual of Doliolum miilleri?S.tei Uljanin 



246. Diagram of SaJpa africana ..... 



247. Anatomy of Appendicularia after Herdman 



248. Lateral view of Amphioxus after Ray Lankester . 



249. Transverse section through pharyngeal region of Amphioxus 



after Ray Lankester . . . . .461 



250. Development of atrial chamber in Amphioxus after 



Lankester and Willey ..... 464 

 251 and 252. The nephridia of Amphioxus after Boveri . 466 



253. Early stages in the development of Amphioxus after 



Hatschek . ... 469 



254. Sections through embryos of Amphioxus, to illustrate de- 



velopment of body cavity .... 470 



254A. Portions of excretory systems of Phyllodoce and Amphi- 



oxus after Goodrich ..... 471 



255. Transverse section through an Elasmobranch embryo 



(diagrammatic) after Ziegler . . . -477 



256 and 257. Ideal fore and hind limb after Gegenbaur . 483 



258. Partial section of brain of young Vertebrate . . . 484 



259. Vertical section of the pineal eye in an embryo of Spheno- 



don after Dendy ... , 486 



260. Diagram of parts of the brain in Vertebrates after 



Gaskell .486 



