INSTITUTE OF SCIENCE, PHILADELPHIA. 1 49 



are sparse, irregular, and obsolete or nearly so. The sculpture of this variety- 

 is very elegant ; it appears to be confined to the Pliocene, and has been found 

 both on the Caloosahatchie and Shell Creek. It is connected by intermediate 

 varieties with the typical form. 



This species is neither a Neptunea (^ Clirysodonuis) nor a Siplionalia 

 {= Strepsidurd). It is not a typical Fiistis, of course, but on comparison with 

 our recent species of Urosalpinx, it is at once seen to have all their characters, 

 and I have no hesitation in referring it to that genus. 



Genus MURICIDBA Swainson. 

 Muricidea spinulosa Heilprin. 

 Plate 8, figure 9. 

 Murex spinulosa Heilprin, Trans. Wagner Inst. i. p. 108, pi. 15, fig. 41, 1887. 



Fossil in the Miocene of the Ballast Point silex-beds, Tampa Bay, and of 

 the Chipola beds, one mile west from the Chipola River, West Florida, at 

 Bailey's Ferry. 



The original specimen having been inadequately figured, I have thought 

 best to give a second illustration of it. This species is quite closely related to 

 the type of Muricidea, M. hexagona, but sufficiently distinct. 



A second species probably of Muricidea was found at the same locality, 

 but the single specimen seemed hardly well enough preserved to describe. It 

 is, however, clearly distinct from any others yet described from this hori- 

 zon, and appears to resemble M. cristatus Brocchi rather closely. 



Muricidea floridana Conrad. 

 Urosalpmx floridana Conrad, Am. Journ. Conch, v. p. 106, pi. xii. fig. 4, i86g. 

 Muricidea floridana Dall, Proc. U. S. Nat. Mus. 1883, p. 326; Blake Gastr., p. 212, 1889. 



Fossil in the Pliocene marls of the Caloosahatchie and Shell Creek. 



One of the specimens shows a considerably more slender shell than the 

 average of this species, and is more constricted behind the shoulder, with a 

 smaller umbilical chink. At first sight it would be regarded as a distinct 

 species. It measures 29 x 13 mm., when the ordinary form measures 29 x 16 

 mm. It may be called var. attenuata. 



Muricidea multangula Philippi. 

 Fusus multangulus Phil., Zeitschr. f. Mai. v. p. 25, 1849. 

 Muricidea ^nultangula Dall, Blake Gastr., p. 213, 1889. 



Fossil in the Caloosahatchie and Shell Creek Pliocene marls ; the later 

 Pliocene of the Myakka River, Florida ; the Post-Pliocene of the same 

 region ; and living on the eastern coast of North America from Cape Fear to 

 Yucatan, together with the Antilles. 



This very elegant species, owing to the neat and clean-cut spiral sculpture, 

 is almost as handsome in the fossil state as it is in the recent condition. 



