148 TRANSACTIONS OF THE WAGNER FREE 



connection with Mr. Aldrich's M. simplex, and is almost without doubt a 

 Urosalpinx ; if indeed it be not an elongated variety of U. trossuhis Conrad. 

 Murex angidatus Meyer might be a young Eiipleura or Urosalpiftx ; but neither 

 the description nor the figure is sufficient to determine its generic place; and 

 when we consider the singular blunders into which this gentleman has fallen 

 on various occasions, we cannot regard his opinion as sufficiently decisive on 

 such a point. 



U. cinereus Say, a very common east-coast species, is referred by Say and 

 Conrad to the Miocene, but it is probable these writers then referred to the 

 very closely allied form described later by Conrad as Fusus trossuhis. It is 

 uncertain whether the U. cinerejcs of Tuomey and Holmes is the typical cinereus 

 or U. trossulus. U. cinereus is not among our collections from the Pliocene 

 marls of Florida, but there seems to be little doubt that it is found in the Post- 

 Pliocene of much of the Atlantic coast. 



Urosalpinx perrugutus Conrad. 

 Fusus perrugatus Conrad, Am. Journ. Sci., n. ser., ii. p. 397, 1S46 

 Urosalpinx perrugatus Dall, Blake Gastr., pp. 212, 214, 1889. 



Fossil in the Pliocene marls of Shell Creek, Florida, and the Upper Plio- 

 cene of the Myakka River in the same region. Living on the west coast of 

 Florida from Cedar Keys to Key West. 



Some specimens of this shell have a minutely imbricated sculpture on the 

 spirals, like that usually characteristic of Coralliophila. 



Urosalpinx trossulus Conrad. 



Plate 7, figure 12. 



Fusus trossulus Conrad, Foss. Tert. Form., p. 18, pi. 3, fig. 5, 1S32 ; Foss. Med. Tert., ist 



ed., p. 84, pi. 48, fig. 6 ; 2d ed., p. 89, 1845. 

 Neplunea trossula Conr., Proc. Acad. Nat. Sci. Phila., Dec, 1862, p. 560. 

 Siphonalia trossula Conr., Am. Journ. Conch, iv. p. 249, 1869. 



Miocene of James River, Virginia, near Smithfield, and of Maryland ; 

 Pliocene of the Caloosahatchie beds and Shell Creek, S. W. Florida. 



This species is very variable ; the typical form is rather more elongated 

 than the specimen figured, which is an especially blunt and .short variety. In 

 the type-specimens of Conrad, which are still preserved, the sculpture is of 

 rather broad primary spirals with a single, much narrower, secondary thread 

 between each pair and two extremely fine tertiary spiral lines, one on each 

 side of the secondary. The faint transverse riblets are subequal, regular and 

 separated by about equally wide interspaces ; the suture, though distinct, is 

 not deep and the whorls are rather compact. The primary spirals are undu- 

 lated, but not granular, and the granulations on the others are inconspicuous. 

 In one of the Pliocene forms (which may be called variety subsidus) the spirals 

 have become subequal, narrow and granulous, with more distinct interspaces, 

 the whorls are less compact, and the transverse ribs on the last whorl or two 



