INSTITUTE OF SCIENCE, PHILADELPHIA. I45 



the Pacific coast species. The PHocene fossils tend toward an intermediate 

 character, as might be expected. I have seen no genuine caiidata from the 

 IVIiocene, though the shell figured by Emmons looks as if it was this species. 



This variety is characterized by its thinner, more expanded and recurved 

 varices, its generally whiter color, larger size, and has, in the adult, on the 

 back, three intervarical, flattish, transverse ribs and two or three in front. The 

 spire is rather more elevated than in the typical caudata, and, except on the 

 \'arices, the spiral threads are often absent or obsolete. Young shells have 

 more intervarical ribs than adults. In the Am. Marine Conchology Mr. 

 Tryon, by some oversight, refers to the synonymy of E. caiidata a Fusiis 

 pyrtdoides oi TlQ Kay, which appears to have been founded on an immature 

 Melongena. It is possible he meant to write Fusus imbricatiis De Kay, which is 

 described on the same page as the other, and figured on the same plate. This 

 figure somewhat resembles a young Eiiplejira, but from the description one 

 would be disposed rather to refer it to an immature Urosalpinx. 



Eupleura muriciformis Broderip. 

 Ranella tmiriciformis Brod., Proc. Zool. Soc. Lond., p. 179, 1S32 ; Reeve, Conch. Icon., 



Ranella, pi. vii. fig. 34, 1844. (Montija Bay, W. Columbia ) 

 Ranella plicala Reeve, Proc. Zool. Soc, p. 138, 1S44 ; Conch. Icon., Ranella, pi. vii. fig. 33, 



July, 1844. 

 Ranella triqueira Reeve, P. Z. S., 1844, p. 139 ; Conch. Icon., Ranella, pi. vii. fig. 41, 1844. 



(San Diego, Nuttall.) 



Living from Venezuela to California on the west coast of America. Fossil 

 in the Post-Pliocene of San Diego, California; of the Pacific coast of Lower 

 California and of the head of the Gulf of California. 



This species is entirely distinct from the F. nitida Broderip of the same 

 region, and I have seen no connecting links with E. pcctinata Hinds, which 

 has been referred to its synonymy. 



There are three varieties in the recent material belonging to this species 

 which I have examined. 



The typical E. imiriciformis has been repeatedly figured. The R. triquetra 

 Reeve is a large specimen with the lip immature ; the R. plicata of the same 

 author is evidently an individual of the same species which has met with some 

 accident, resulting in the shortening of the canal. The U. S. Fish Commission 

 has dredged a fine series of E. rmiriciforvns in the vicinity of Cerros Island, 

 Lower California. The adult has the following characters: 



On the last whorl there are three strong knobs between the varices on 

 each side ; there is a thin, webbed varix with six primary spines, all recurved 

 and deeply grooved in front; within the aperture there is a dentiform callus 

 on the outer lip between every pair of spines and one on each side of the 

 sutural commissure ; the spine at the shoulder is much the longest, but the 

 second spine, counting forward, is the one corresponding to the a.xis of the 



