226 PROCEEDINGS OF THE NATIONAL MUSEUM. tol. 54 



DESCRIPTIONS OP SPECIES. 

 TURRIS (CRASSISPIRAI) RUGITECTA, new species. 



Shell solid, moderately large with, ten whorls, exclusive of the 

 (lost) nucleus, blackish brown with a broad pale peripheral band; 

 axial sculpture of about (on the penultimate whorl 17) short oblique 

 similar ribs, beginning at the shoulder and on the last whorl gradu- 

 ally becoming obsolete toward the canal, separated by subequal inter- 

 spaces; spiral sculpture of in front of the suture a prominent blunt 

 keel, in the anal f asciole two or three subequal cords ; in front of the 

 shoulder (on the penultimate whorl four, on the last whorl twelve or 

 more) flattish equal cords overrunning the ribs, separated by nar- 

 rower grooves which toward the canal become gradually wider ; apex 

 acute, last whorl more than half of the length of the shell, aperture 

 rather narrow, smooth within, the enamel dark brown except where 

 the pale band reaches the margin of the outer lip ; anal sinus wide, 

 not very deep, rounded proximally, canal wide, short, slightly curved 

 to the right, with no siphonal f asciole. Length of shell 30; of last 

 whorl 16 ; of aperture 12 ; maximum diameter of shell 10 mm. 



Habitat. — Lower California, off San Bartolome Bay, Dr. Paul 

 Bartsch. U. S. Nat. Mus., Cat. No. 266911. 



This is a remarkably fine species, less black than most of the species 

 of Crassispira. Toward the upper part of the spire the spaces be- 

 tween the ribs remain brown, but on the later whorls they partake 

 of the waxen pale band as well as the ribs. 



PLICIFUSUS (RETIFUSUS) SCISSURATUS, new species. 



Shell slender, elongate, acute, with grayish buff colored perios- 

 tracum and about eight whorls without the (lost) nucleus; suture 

 distinct, slightly appressed; whorls moderately convex; axial sculp- 

 ture on the penultimate whorl of about thirteen narrow, rounded, 

 retractively arcuate plications extending from suture to suture and 

 on the last whorl over the periphery to become obsolete on the 

 base; spiral sculpture of (on the penultimate whorl 10-11) straplike 

 flattish bands separated by narrow deeply cut grooves, and divided 

 by a shallower groove in the center of each spiral; these bands are 

 practically uniform over the whole surface; aperture sublunate, the 

 canal wide, recurved, half as long as the aperture ; outer lip recurved, 

 thin, white, the throat more or less livid ; pillar white, erased, arcuate, 

 obliquely truncate in front, the fasciole inconspicuous. Length of 

 shell 55 ; of last whorl 35 ; of aperture and canal 25 ; maximum diam- 

 eter of last whorl 19 mm. 



Habitat. — Nemuro, Japan. Hirase collection, U. S. Nat. Mus., 

 Cat. No. 274071. 



