350 VELUTINID^. 



(which wo liave compared with Lovcn's figure and descrip- 

 tion) is broadly quadrate and hamate with a serrated apex 

 and prominent central denticle. The two first laterals are 

 serrated at their upper hooked borders also, and have a 

 large tooth at their inner sides. The second and third 

 laterals are simple and uncinate. 



This species is so generally distributed through the 

 British Seas that to enumerate localities would be super- 

 fluous. It inhabits various depths of water from the 

 Laminarian zone to thirty fathoms, and is most frequent 

 on a shelly ground. It has a wide range extending 

 throughout the Celtic and Boreal Seas, and along the 

 shores of Boreal America. According to Middendorff it 

 ranges throughout the Icy Sea, and is found on the coast 

 of Kamtschatka. It occurs fossil in the mammaliferous 

 crag. 



V. FLEXiLis, Montagu. 

 Greenish yellow, perfectly membranaceous. 



Plate XCIX. fig. C, 7, and (Animal) Plate 0. fig. 6. 



Bulla plicatilis, Mux-ler, Prodr. Zool. Danic. p. 2924 ! (teste Loven). 



„ Jlexilis, Mont. Test. Brit. Suppl. p. 168. — Laskkv, Mem. Werner. Soc. 

 vol. i. pi. 8, f. 6. — TuRT. Conch. Diction, p. 25. — Fleming, 

 Brit. Anim. p. 294. 

 yduiiiia plicatilis, LovKS, Index Moll. Scandinav. p. 15. — Aluek, Moll. 



Northumb. and Durh. p. 69. 

 Coriocella flea'ilis, Macgilliv. IMoll. Aberd. p. 161. 

 Siyurttus „ Brown, Ulust. Conch. G. B. p. 23, pi. 2, f. 3, 4. 



Though Miiller, as a writer, was long prior to Montagu, 

 his description of the Bulla plicatilis is so utterly inade- 

 quate for its identification (four characters only are men- 

 tioned and no figure referred to), that we have preferred 

 the epithet bestowed on it by the later but more accurate 

 naturalist. This strange-looking shell reminds one of 



