170 BULLETIN OF THE 



upper whorls ; these are slightly swollen, but not keeled, where they pass over 

 the ribs ; between these are numerous fine close-set threads slightly marked 

 by inconspicuous lines of growth. The transverse sculpture consists of (on 

 the last whorl 10) rounded rather close stout ribs which pass clear over the 

 whorl and are straight and slightly larger behind ; suture appressed and wavy, 

 conspicuous ; canal stout, slightly twisted, aperture subovate, marginated ; outer 

 lip internally lirate with two or three strong denticles anteriorly ; inner lip 

 smooth, or slightly granulous. Max. Ion. of shell, 24.0 ; of last whorl, 16.5 ; 

 of aperture and canal, 12.5; max. lat. of shell, 9.0 mm. 



Habitat. Station .36, in 84 fms.. Gulf of Mexico; off Sombrero, in TO fms. 

 U. S. Fish Commission Station 2648, off Cape Florida, in 84 fms., green mud. 



This species recalls F. Bocayei Fischer, dredged by the Travailleur in about 

 600 fms., but that species, from an authentic specimen, is shorter, stouter, with 

 only seven transverse ribs and three principal spiral threads on the spire. The 

 fine spirals in F. Bocagei are also more conspicuous. F. cepynotus has a little 

 the aspect of Fusus carolinensis Verrill, especially the young ones, while differ- 

 ing in many details, especially the number and straightness of the ribs. Its 

 nearest relative would seem to be a form named by Borson Fusus lamellosus, 

 from the Tertiary of Modena; but this is merely the young of i*^. rostratuSj and 

 the adult has very different characters, 



Fusus alcimus n. s. 



Shell resembling the last species, but shorter and more acute at both ends, 

 with only six much more oblique and proportionally stouter ribs, coarser re- 

 volving spirals, and none of the fine spiral striation which exists between the 

 primary threads of F. cepynotus. It has eight whorls; the nucleus is strongly 

 plicate below; the interspaces between the ribs are deep, and in them the 

 spirals are much closer together than they are on the summit of the ribs; on 

 the last whorl there is sometimes an intercalary single fine spiral thread. The 

 color is yellowish with touches of dark brown ; the canal is very short ; the 

 aperture is contracted, the lips much thickened, the outer one strongly inter- 

 nally lirate, the inner one smooth ; the suture is inconspicuous and very much 

 waved. Max. Ion. of shell, 15.0; of last whorl, 9.2; of aperture and canal, 7.0; 

 max. lat. of shell, 7.0 mm. 



Habitat. Station 32, in 95 fms., 100 miles north of Yucatan, in the Gulf 

 of Mexico. 



Fusus alcimus var. Rushii Dall. 



Shell smaller, pure white, nucleus hardly plicate, depressions between the 

 ribs less deep, ribs less prominent and hardly oblique. Lon. of shell, 8.5; 

 lat. 4.0 mm. 



Habitat. West of North Bernini, Bahamas, in 200 fms., Dr. "W. H. Rush, 

 U. S. N. 



