197 



ulata, croceo tincta, fauce castaneo et albido fasciato ; operculo 

 tenui. Diam. f poll. Hob. Grand Cape Mount, Liberia, on 

 rocks in rapid streams. 



A small, very solid species, somewhat similar to A. Storeria, 

 Jay, from the river Amazon. 



Trichotropis pusillus. T. minuta, rhomboidea, umbilico 

 semicirculari perforata, albida, striis minutis volventibus cincta ; 

 spira conica, anfr. 4-5 convexis, ultimo ventricoso et costis ele- 

 vatis tribus cincto ; apertura semicirculari ; columella recta, ad 

 planitiem labri acuti trilobati baud assurgente ; umbilico semicir- 

 culari. Axis ^ poll. Hab. Crevices of rocks beaten by surf, at 

 Fishtown, Liberia. 



This curious little shell was also collected by the Exploring 

 Expedition, probably at the Cape de Verds. No hairy epidermal 

 processes appear on any of the specimens ; yet I cannot doubt 

 that it belongs to the genus where I have placed it. 



Aplysia fimbriata. a species somewhat resembling A. 

 dactylomela from South America was collected and figured by 

 Dr. Perkins, without, however, giving the colors. It is about 5 

 inches long when fully extended, and about 3^ inches across the 

 lobes when quite expanded. The margin of the foot is some- 

 what corrugated, and the margin of the lobes sinuate. There 

 are 8 or 10 large, black annuli on each side of the exterior of 

 the mantle. The margin of the interior, which is dark, is digi- 

 tate with white, the digitations being more or less rectangular. 

 The cervical tentacles are small and slender ; the cephalic ten- 

 tacles have a coarsely fringed margin. The calcareous shield is 

 thin and delicate, with a strong epidermis extending beyond its 

 edge ; it is obliquely ovate triangular, quite acute at apex. 



BtJLiMUs iNTERSTiNCTUs, Nob. (Procecd. I. 158.) proves to be 

 very variable in form, and especially in color, being green, brown, 

 ochreous, sometimes spotted, &c. Bulimus ruhicundulus, Nob. 

 (ibid.) is one of these varieties. 



The collection contained several interesting bivalve shells, 

 which may be described on some future occasion. 



A fine specimen of quartz crystals was presented in the 



