220 AMALIA. 



A. PECTINATA, Selenka. PI. 54, figs. 68, 69. 



Finely rugose, strongly carinate, shield smooth, rounded, free 

 in front, flattened or slightly emarginate on the posterior margin, 

 bearing a shell-sulcus, under which is a small oval shell, with 

 posterior median nucleus ; shield and back blackish brown, foot 

 and head grayish brown. Length (in spirits), 30 mill. 



Sydney, N. S. Wales. 



A. SANDWICHENSIS, Eydoux. PL 54, figs. 70-73. 



Acuminate behind, obliquely grooved, with a marginal groove 

 surrounding the foot; shield large, finely granular, free in front; 

 brownish black above, whitish below. Length, 20 mill. 



Sandwich Islands. 



The shell-plate is figured with a central nucleus, like a Patella; 

 if the figure is correct, this character might serve for the crea- 

 tion of a new genus. I place the species in Amalia with some 

 reserve because the description is insufficient. 



A. HEWSTONI, Cooper. PL 54, fig. 75. 



Back strongly carinate ; mantle granulate-rue ose, with a sub- 

 elliptical groove above the level of the respiratory orifice, which 

 is just behind the middle ; color blackish brown, or deep black 

 above, the sides paler, the base of the foot whitish. 



Length, 2*5 inches. 



Gardens, in San Francisco, Gal. 



In the remarkable groove on the mantle it differs from others 

 described ; this does not coincide with the outline of the attached 

 portion of the mantle, or with the internal plate. It is some- 

 times scarcely visible (Cooper). 



It is possibly an introduced species, as it has only been seen 

 in San Francisco. Dr. Cooper suggests that it may be L. Sand- 

 wichensis. 



Section GIGANTOMILAX, Bottger, 1883. 

 A. LEDERI, Bottger. PL 2, figs. 99, 100. 



Rugose ; shield anterior, rounded behind ; dorsum strongly 

 carinated ; central zone of locomotive disk scarcely wider than 

 the lateral zones ; blackish, the sides marbled with gray, carina 



and shield gray. Length (in alcohol), 68 mill. 



Caucasus. 



