1G6 BULLETIN OF THE 



reminded me of a young Phos. Fusus perrugatus Conrad (Florida, 1846) is 

 better classified in the genus Urosalpinx. On the other hand, Urosalpinx caro- 

 linensis Verrill appears much like a Fusus of short and compact form. The 

 species of Fusus described as new by Holmes, in the " Post Pleiocene Fossils 

 of South Carolina," are all young shells of Nassa, Columbella, etc. The Colus 

 exilis of Conrad, figured in the Pliocene part of the same work, is not known 

 to me in a recent state. The species dredged by the U. S. Fish Commission 

 along the eastern coast, with the exception perhaps of Sipho glyptus Verrill, 

 belong to Chrysodomus and its subdivisions, or, at all events, not to Fusus 

 proper. The researches of the Blake and the Albatross in the Gulf and An- 

 tillean region enable me to add several interesting forms to the list of known 

 species, and new localities for some which have been regarded as rare. 



Fusus tirnessus n. s. 



Shell solid, waxen white, with nine and a half inflated whorls. Nucleus of 

 two whorls, swollen, polished, the last whorl with sharp transverse riblets. 

 Sculpture of sharply carinate spiral ridges, 6-8 on the earlier whorls, 11-15 on 

 the last whorl, beside about 20 on the canal. On the last whorl, the four or 

 five ridges in front of the suture are smaller than the others ; there is generally 

 a small sharp ridge between the pairs of large ones which becomes a fine thread 

 if we follow it up the spire; on the canal all the ridges become less prominent 

 anteriorly. On the apical whorls there are 10-12 transverse ribs, rounded, and 

 only prominent toward the periphery; the ridges run over these without much 

 change and the transverse riblets become fainter on the later whorls and usually 

 vanish on the last one. The only other transverse sculpture is formed by the 

 lines of growth, which are rather sharp and scalloped between the ridges, cor- 

 responding to serrations of the outer lip; the whorls increase rapidly in diam- 

 eter, and the suture is deep but not channelled. The base of the last whorl is 

 rather suddenly constricted, while the canal tapers rapidly. The aperture is 

 small, surrounded by a continuous sharp lip-lamina which extends to the end 

 of the canal. The outer lip is strongly serrate, corresponding to 12-14 strong 

 internal lirse; the inner lip is also Urate, but the lirse are often broken up irreg- 

 ularly toward their outer ends. In the immature shell the lamina about the 

 mouth and the lirations on the inner lip are of course absent. Max. Ion. of 

 shell, 88.0; of last whorl, 60.0; of aperture, 20.0; of aperture and canal, 

 55.0; max. lat. of shell, 33.0; of aperture, 15.0 mm. 



Habitat. U. S. Fish Commission Stations 2134, south of Cuba, in 254 fms., 

 sand; 2316, off Key West, in 50 fms., coral bottom, temperature 74°.0; 2404, 

 in the Gulf of Mexico, between the delta of the Mississippi and Cedar Keys, 

 Florida, in 60 fms., sand; and 2411, between Cedar Keys and the Dry Tortugas, 

 in 27 fms., sand. 



This is a very remarkable species; in the short and rapidly increasing spire, 



