78 AURICULA. 



some species of whicli the perforation is in the point of the 

 umbones, a specimen of which is represented in the Introduc- 

 tion. This species of attachment does not keep the animal 

 motionless, although it is confined to a particular spot. Other 

 shells are attached by a portion of their own substance, as in 

 Chama, Spondylus, Serupla, &c. in which instances, the attached 

 valve is motionless, and is termed the under valve. The Pedun- 

 culated Cirripedes are attached by a tubular tendinous process, 

 called a peduncle. 



ATUErlA. Bronn. A genus typified by Nautilus zigzag, having 

 an angularly lobed septum. Edwards. Cephalopoda of London 

 clay. P. 54, 



ATTS. Montf. 1810. A generic name including those species of 

 Bulla, which are described as " convolute, with the last whorl 

 covering the rest and hiding the spire, the apex rounded at both 

 ends." In Sowerby's Thesaurus Mr. Adams enumerates 22 

 species. Bulla Naucum, Auct. fig. 250. 



ATJEICLE. (A little ear.) See Aueiculated. 



AFEICULA. Lam. 1801. (Dim. from Auris, an ear.) Fam. 

 Auriculacea; Bl. Colimacea, Lam. — Descr. Oval or oblong, cylin- 

 drical or conical ; aperture long, narrow, generally narrowest in 

 the centre ; rounded anteriorly, with two or three strong folds 

 on the inner lip, and the outer lip thickened, reflected, or denti- 

 culated; spire short, obtuse, epidermis horny, brown. — 06s. 

 The above description includes the A. coniformis, f. 298. and 

 several other conical species with narrow apertures, which 

 formed the genus Melampus, Montf. and Conovulus, Lam. The 

 latter author suppressed his genus on ascertaining the Conovuli 

 to be land shells. We exclude, however, the A. Dombeyana, 

 Lam. f. 300. and several similar species, which being more 

 rounded, having thin outer lips and but one fold on the colu- 

 mella, are described under the generic name Chilina, Grray. It 

 appears rather doubtful whether the Auriculae are marine or 

 fluviatile, but the animals appear to be amphibious. The Auri- 

 culae are principally found in salt marshes of tropical climates, 

 some small species are found on the southern European coasts, 



