MUSEUM OF COMPARATIVE ZOOLOGY. 175 



Sipho Rushii n. s. 



Shell small, thin, white, elongated, with a furfurescent epidermis and six 

 whorls. Nucleus regular, white, smooth, but becoming gradually spirally 

 striate ; whorls well rounded, suture distinct ; spiral sculpture of (between the 

 sutures 5) primary threads, with a smaller thread in the intervals and finer 

 ones on the anterior part of the last whorl and canal ; these are crossed by fine 

 flexuous lines of growth which decussate the threads, or give them, in strongly 

 sculptured specimens, a somewhat beaded look ; there are also 12-15 faint 

 flexuous ribs crossing the whorl, tending to become obsolete on the last half of 

 the last whorl, and more marked on some specimens than on others ; these are 

 quite concave at and behind the periphery ; canal short, narrow, twisted to the 

 left; columella rather concave ; aperture entirely simple, with no visible cal- 

 lus ; operculum rather wide and short. Max. Ion. of shell, 11.0; of last whorl, 

 7.5; of aperture and canal, 5.5 ; max. lat. of shell, 4.5; of aperture, 1.25 mm. 



Habitat. Station 264-4 of the U. S. Fish Commission, off Cape Florida, in 

 193 fins., sand, bottom temperature 43°.4 F. Also in 205 fms., off Fowey 

 Rocks, in the Straits of Florida, by Dr. W. H. Rush, U. S. N. 



This is a delicate and pretty little shell, which is, in its general characters, 

 very much like the young state of Tritonidea limbata Philippi ( + Fitsus pul- 

 chellus Pfr. non Phil.) ; but that is more strongly sculptured and hao a different 

 nucleus, beside being clouded with color. 



Sipho? (Ptychosalpinx?) globulus n. s. 



Plate XXXV. Fig. 13 a. 



Shell stout, short, white, spirally channelled, with about six whorls; spire 

 short, whorls moderately rounded, apex rather blunt ; nucleus small, depressed, 

 glassy, smooth ; spiral sculpture of (between the sutures) about a dozen broad 

 flattened cinguli separated by narrower channelled interspaces, and covering 

 very equally the whole shell ; there are also a few faint spiral stria?, especially 

 in the channelled interspaces near the aperture; transverse sculpture only of 

 rather strong lines of growth, most evident in the channels. Suture very dis- 

 tinct; aperture elongate, arched, the outer lip thin, smooth, and hardly thick- 

 ened inside; a little callus in the commissure and on the body and pillar; 

 canal wide, very short, deeply notched, strongly twisted to the left; siphonal 

 fasciole narrow but distinct, sharp-edged, producing false plaits under the 

 columellar enamel ; columella arched, its anterior edge sharply keeled. Oper- 

 culum rather bluntly pointed. Max. Ion. of shell, 31.0; of last whorl, 25.0; 

 of aperture and canal, 21.5; max. lat. of shell, 20.0; of aperture, 9.5 mm. 



Habitat. Station 2655 of the U. S. Fish Commission, in 338 fms., ooze, on 

 the Little Bahama Bank, the bottom temperature 47°. 5 F. 



This shell is thin, and recalls Odcorys as well as Liomesus. The nearest rel- 

 atives, conchologically, are Chrysodomus ventricosus Gray, from Newfoundland, 

 which is a much larger shell with a strong epidermis and longer canal, and the 



