MUSEUM OF COMPARATIVE ZOOLOGY. 211 



to Florida, Vera Cruz, Bermuda, and the Antilles. Off Sombrero in 54 fms., 

 Blake Expedition. 



I found this form together with Urosalpinx tampaensis and varieties of 

 U. cinereus on the oyster-beds in Tampa Bay, exactly as described by Conrad 

 nearly half a century ago. The Tampa specimens have spots of purplish brown 

 inside the mouth, but most of the specimens from other localities have the 

 mouth whitish with a brownish throat. It has been received from the Antilles 

 under the name of M. casta A. Adams; it is probably the same as Sowerby's 

 M. jamaicensis, which appears to be a young shell, and it is without doubt the 

 shell whose varieties are catalogued by Melvill in his list of Florida shells 

 under the names of Murex tetrarjonus and cycloslomus. The very slender and 

 strongly recurved canal is almost always broken off in cabinet specimens. 



Favartia (cellulosa var. ?) levieula Dall. 



This form differs from the typical cellulosa in being somewhat smaller and 

 more slender, with one less varix on the average and with the varices thinner, 

 6omewhat more branched, and each forming a sharp-edged rather than a broad- 

 ish rounded ridge. The revolving ribs are feebler, and in nearly all the speci- 

 mens entirely obsolete over most of the space between the varices on the last 

 whorl. This gives the shell a very different aspect, but a tendency to such a 

 condition is seen in some specimens of cellulosa and other apparently allied 

 species. I regard it as a variety of cellulosa, and Sowerby's figure (Thes. 

 Murex, pi. xxiii. fig. 223) of his jamaicensis would fairly well represent a 

 specimen in which the ribs had not become obsolete. 



This form was obtained by the U. S. Fish Commission off Cape Lookout, 

 N. C, at Station 2609, and in 25-40 fms. at various stations in the Gulf of 

 Mexico, including Key West. 



Favartia intermedia C. B. Adams. 

 Murex intermedins C. B. Adams, Contr. Conch, p. 60, 1850; not of Tryon. 



This species is found from the Florida Keys to Vera Cruz, Mexico, is abun- 

 dant at Bermuda (Hamlin), and has been received from Cuba and St. Thomas. 



It is entirely distinct from the shell called Triton Cantrainei by Recluz and 

 M. paupcrculus by C. B. Adams. That species may be identical with M. alve- 

 olus Kiener, as claimed by Tryon, but he is wrong in referring the present 

 species to it. It may be distinguished from M. cellulosa Con. by being more 

 slender, elevated, and having in the adult the last varix proportionally larger 

 thon any of the others. M. pauperculus C. B. Adams, which is in the National 

 Museum from Vera Cruz and St. Thomas, is remarkable for having a sort of 

 calcareous whitish outer coating, like that seen on Ranella hastula Reeve, 

 which is easily removed, and under which the shell is often of a darker color. 



