286 APPENDIX. 



length, and forms an obtuse angle with it ; hence imparting a 

 semi-rhomboidal aspect to the mouth. The emargination is very 

 broad. The operculum is very small, and of a deep bright yellow 

 on its inner surface. 



Mr. Barlee took his specimens (some of them two inches in 

 length), " abundant," north and east, thirty miles off Zetland. 

 In the neighbourhood of the same islands he has taken Fusus 

 Berniciensis (one of the examples four inches and a quarter long), 

 Mangelia purpurea, vur. asperrivia, Mangelia nana, Natica He- 

 licoides, and Natica pxisilla. 



Vol. iii. p. 449. Mangelia. 



Pennant's Murex acuminatus (Brit. Zool. ed. 4, vol. iv. p. 125, 

 pi. 79, fig. 4 of central group?) is evidently a member of this 

 genus, but too imperfectly defined* for identification. 



Vol. iii. p. 512. Ctlichna obtusa. 



The Bulla pertenuis of Mighels (Boston Journal Nat. Hist., 

 vol. iv. p. 346, pi. 16, f. 3,) so closely resembles the variety 

 Jeverensis, that the difference is scarcely appreciable. 



Mr. Byerley, of Birkenhead, having taken this species alive, 

 communicated the animal to Mr. Alder, who writes to us re- 

 specting it. — " I find it is a true Cylichna, approaching much 

 more nearly to C. truncata than to C. cylindracea. The head- 

 disc is remarkably short, and has two lateral prominences stand- 

 ing up like cars ; they are rounded, and do not terminate in 

 points like those of C. truncata. I cannot perceive any 

 eyes." 



Montagu has referred to this species the Bulla Regulhiensis of 

 Adams (Microscope, pi. 14, f. 28), an immature shell of doubtful 

 parentage. 



* Some of Pennant's figures are so bad that we have not ventured to cite them. 

 His Turbo IcBvis (p. 130, pi. 79, top fig.) is an EuUma, but which species we 

 cannot declare ; his Turbo duplicaUs (p. 129, pi. 8) , f. ] 1 2) is perhaps Turriidlu 

 cincta: his fluviatile Helix Icevigata (p. 140, f. 139) probably a Velutma. 



