216 AM ALT A. 



Smaller shield, less gibbose, carina more pronounced and flexu- 

 ose than the preceding species ; also distinguished by the color 

 of the sole. 



A. ETRUSCA, Issel. PL 53-, fig. 44. 



Rugose, strongly cnrinate, the carina acute, triangular, flexu- 

 ous ; shield large, moderately granulate, emarginate behind, the 

 sulcus black, subpentagonal, longer than wide, moderately pro- 

 duced in front, acutely angulate above the pulmonary orifice, 

 blackish, with lighter dots near the margin, laterally obsoletely 

 bizonate ; orifice posterior, pallid margined ; general color 

 brownish, reticulated with black, blackish on the back, carina 

 black; sole brownish, the lateral areas becoming blackish behind. 



Length (in alcohol), 31 mill. 



Tuscany. 

 A. PYRRICHUS, Mabille. PI. 53, fig. 40 ; PL 54, fig. 61. 



Brownish yellow, the carina yellowish white, subacute, with 

 small black dots ; head and tentacles blackish, sole dirty white ; 

 shield truncate behind, black-grooved on either side of the shell- 

 plate. Length, 2-2*5 inches. 



France. 



Distinguished from A, marginata in form and coloration, the 

 shield-sulcus hardly visible, the carina less distinct, the jaw with 

 distinctly striate extremities that of A. marginata being smooth. 

 It is L. marginatus of Moquin-Tandon, in part. 



A. GRACILIS, Leydig. PL 53, fig. 45. 



Narrow, graceful, varying in color from dirty ochre to blackish 

 (or yellowish gray with blackish lines), lighter on the sides, carina 

 dirty yellow, sole blackish gray, shield without the black sulcus- 

 markings of A. carinata. Length, T5-2 inches. 



Shell very small, long and narrower than in A. carinata, 



Eastern Germany, Hungary. 



The synonyms are A. marginata, and A. Cibienensis, Kimak., 

 and A. Budapestensis, Hazay. 



A. INSULARIS, Lessona and Pollonera. PL 53, figs. 46, 47. 



Coarsely rugose ; carina acute, triangular, undulated, whitish 

 on the top ; shield moderate, coarsely granulated, profoundly 

 emarginate behind, with a pentagonal black sulcus, produced in 



