218 AMALTA. 



A. GAGATES, Drap. PI. 53, figs. 53, 54. 



Elongated, graceful, minutely rugose, distinctly carinated ; 

 blackish, lead-colored or olivaceous, not maculated, lighter col- 

 ored on the sides, carina rarely lighter ; shield minutely granular- 

 subrugose, posteriorly emarginate, with a profound elongated 

 subpentagonal sulcus ; head and tentacles blackish ; sole uni- 

 colored, or with darker lateral zones. Length, 2*5-3*5 inches. 

 Southern Europe, N. Africa, St. Helena and 



Madeira (introduced). 



Var. TYPUS. Black, the sole pallid unicolored, or with black 



margin. 

 Yar. OLTVACEA, Moquin. Brownish olivaceous, unicolored, sole 



pallid or olivaceous. 

 Yar. BEDRIAG^E, Lessona and Pollonera. Black, the sole with 



blackish lateral zones. 



Yar. BENOITI, Lessona and Pollonera. Black, with white carina. 



A. ICHNUS^E, Lessona and Pollonera. PI. 53, fig. 55. 



Differs from A. gagates, which it resembles in color and general 

 features, in its smaller size and weaker carina, and in the median 

 zone of the sole being dark and the lateral zones pallid. 



Length (in alcohol), 3(?-35 mill. 



Island of Sardinia. 

 A. SCAPTOBIUS, Bourg. PI. 53, fig. 56. 



Long and narrow, strongly carinate, posteriorly acute ; back 

 lightly reticulated, sordid whitish or grayish; sole whitish ; 

 shield oval, bipartite, subgranular, grayish with darker spots. 



Length, 25 mill. 



Algiers. 



Heynemann considers this = M. gagates, Drap. 



A. EREMIOPHILUS, Bourg. PI. 53, figs. 57, 58. 



Yellowish, passing into bluish on the flanks ; shield bipartite, 

 granulated, bilobed behind ; carina long ; disk yellowish ash. 



Length, 50 mill. 



A Igiers. 

 A. BARYPUS, Bourg. PL 54, figs. 59: 



Bluish ash, lighter on the sides, the rugae subpentagonal, 

 defined by blackish lines ; carina acute, whitish.; shield rounded, 



