Fig. 



259. Trematis terminalis. Fragment, showing the outward sculpture (not punctation). 



260. „ „ A small specimen figured by Mr. Sharpe. 



261 — 263. SiPHONOTRETA UNGUICULATA, Eichw., Sp. 



264. „ „ Interior of dorsal valve. 



265. „ „ Interior of ventral valve. 



266. „ conoides, Kut. 



267. 268. „ verrucosa, Eichw. 



269. „ unguiculata. Section from Kutorga's paper on the genus. 



270. „ „ A spine enlarged. 

 271 — 273. Acrotreta subconica, Kut. 



274, 275. „ „ Enlarged. 



276, 277. LiNGULA anatina. 



278. „ „ Iniexiox oi ventral valve . 



279. „ ,, Interior of dorsal valve. 



280. Obolus apollinis, Eich. (ventral valve), genus Ungula, Pander; Aulonotreta, Kutorga. 



281. „ „ Dorsal valve. 



282. „ „ Interior of dorsal valve, from a specimen sent to me by Professor Kutorga. 

 283 & 285. „ „ Interior of the ventral valve, published in Professor Kutorga's ' Memoir.' 

 284. „ ,, Fragment of the interior of dorsal valve, in Professor Kutorga's ' Memoir.' 



