50 Panama Shells. 



PURPLRID^s 



resembles a variety of the same species, which Mr. Redfield 

 has received from Carthagena. But figs. \Qd and 16g- re- 

 present the kindred type of the Pacific shore. This we sup- 

 pose to be O. araneosa of Lamarck. The difference between 

 the Caribbean and the Pacific types is somewhat less in value 

 than the average difference between species. But we have 

 elsewhere shown, (Cont. Conch, p. 191,) that it is impossible 

 to make all the species of exactly equal value. Those figures 

 on Mr. Reeve's pi. X, which we have not before referred to in 

 this paragraph, represent probably one or two other species of 

 the Pacific coast. 



In consequence of this union of distinct types, Mr. R. gives 

 as the habitat of O. reticularis, " Gulf of California ; Donnet. 

 I. of G-ranada, Westlndies ; J. Cuming." 



Station. — Unknown. 



Habitat. — South Seas? Lamarck. 



Bay of Panama; C. B. A. ! 

 In the fruit shanty we found 1 specimen, in company 

 with other shells, all of which had been taken near Panama. 



34. Oliva inconspicua. Nov. sp. 



Shell rather slender : white : smooth : spire about as long 

 as the aperture : apex rather obtuse : whorls six, with a well 

 impressed suture, slightly convex : aperture acuminate in the 

 upper half, subrectangular in the lower half: labrum thin : 

 anterior notch very slight, wide. 



Mean divergence about 30° ; in another specimen nearly 

 40° ; length .15 inch ; breadth .055 inch. 



Station. — Unknown. 



Habitat. — Panama; C. B. A. ! 



We obtained only 3 mature specimens and one immature, 

 in picking over several quarts of fine drift materials gathered 

 on the shore near the city wall. 



