AURICULID^. 223 



only being contractile, and not retractile like those of 

 Helices, and other land Mollusca. 



This genus, on account of the similarity of its 

 shell, has been confounded also with Truncatella of 

 Risso, which is a marine animal, provided with gills 

 and a distinct operculum. 



The animal walks with its shell nearly perpendicu- 

 lar, twisting it round in a very odd manner, and then 

 letting it suddenly fall again. 



Though this species has been generally placed in 

 the genus Carychium, neither the animal nor the shell 

 well agrees with that genus. The animal most nearly 

 resembles a Cyclostoma, with its long filiform tentacles 

 and proboscidiform head ; but it has no operculum. 

 The shell has some resemblance to some Bulimi. Dr. 

 Turton placed it in that genus, and erroneously de- 

 scribes the animal as having four tentacles. 



84. 1. ACME fusca. Brown Acme. (t. 6. f. 66.) 

 Shell cylindrical, obtuse, glossy brown, transpa- 

 rent, with rather distant parallel oblique longitu- 

 dinal striae, (p. 219. 3.) 



Turbo fuscus. Boys and Walker, Test. Min. Rar. 

 12. t. 2. f. 42. ; Wood, Supp. t. 6. f. 15. 



Auricula lineata. Drap. Hist. 57. t. 3. f. 20, 21. 



Carychium cochlea, Studer, Catal. 21. 



lineatum. Ferussac, Tab. Syst. 100.; 



Rossm. v. 54. L 28. f. 408. 



Cyclostoma lineatum. Ferussac, Diet. Class. H. 

 Nat. ii. 90. ; Pfeiffer. 



Acme lineata. Hartm. Fauna, t. 1. f. 4. 



Carychium fuscum. Fleming, B. A. 270.; Jef- 

 freys, Linn. Trans, xvi. 364. 



Bulimus lineatus. Turton, Man. ed 1. 82. f. 66. 

 L 4 



