68 TRANSACTIONS OF THE WAGNER FREE 



FOSSILS OP THE PLIOCENE (" FLORIDIAN ") FORMATION 

 OF THE CALOOSAHATCHIE. 



Murex imperialis, Swainson. 



Zoological Illustrations, id ser., ii, p. 67. 



Tryon, Manual of Conchology, ii, p. 101, pi. 23, fig. 206. 



A limited number of individuals from the banks of the Caloosahatchie 

 below Fort Thompson, showing no essential variation from the living form. 

 The occurrence of this species in the Pliocene deposits of the State prac- 

 tically determines its true home to be the Atlantic border of America 

 and not the Pacific coast, as is frequently asserted (Reeve, Conchologia 

 Iconica, Murex, sp. 42). 



Murex brevifrons, Lam., var. calcitrapa. Lam. 

 Animaux sans VertSbres, !x, p. 573. 

 Tryon, Manual of Conchology, ii, p. 95, pi. 19, fig. 175. 



Banks of the Caloosahatchie below Fort Thompson. 



All the specimens obtained by us appear to be immature forms, and 

 none would measure, if perfect, more than an inch and a half in length. 

 I can detect no character by which to distinguish them from the recent 

 form, unless it be in a greater regularity and prominence of the revolving 

 lines, and a further projection of the variceal spines. The species also 

 grades into M. crocatus, which appears to be nothing more than a nodu- 

 lose variety of M. brevifrons. 



Fusus Caloosaensis, nov. sp. Fig. i. 



Shell typically fusiform, of about ten volutions; spire acuminate, 

 about one-third the length of shell, with a slightly papillate apex ; whorls 

 sub-angular, longitudinally ribbed, and crossed by somewhat distantly- 

 placed, elevated, revolving lines, the median two of which on the whorls 

 above the body-whorl appear more developed than the others. 



Body-whorl with about nine revolving lines, the two on the shoulder, 

 with occasional intermediate finer lines, least prominent; aperture semi- 

 oval, with a long, nearly straight canal, of about twice its own length, 

 the two combined considerably more tfian one-half the length of the 

 entire shell ; outer lip thin, striated internally. 



Length, 2.2 inches; width, .6 inch. 



Caloosahatchie, in the banks below Fort Thompson. 



This shell most nearly resembles among living forms FHSHX llupctit- 

 Thouarsi, but differs from it in its subangular whorls (evenly convex in 



