dall] new species of shells 159- 



TRITONOFUSUS ESYCHUS Dall, n. sp. 



Shell slender, acute, solid, of a pinkish brown color, and about 

 eight moderately convex whorls ; apex more or less eroded, acute, the 

 suture not deeply constricted ; sculpture of numerous fine, narrow, 

 flattish spiral ridges, with a tendency to pair, separated by narrower,, 

 not channeled interspaces ; the sculpture is distinct but not strong ; 

 there are about 25 spirals on the penultimate whorl, of which perhaps 

 one-third are rendered duplex by a medial groove ; aperture ovate,, 

 livid pink, the outer lip slightly reflected ; pillar slender, strongly 

 twisted, and almost pervious ; canal contracted and recurved. Lon. 

 of shell, 52 ; of last whorl, 33 ; of aperture, 24 ; maximum diameter of 

 shell, 21 ; of aperture, 10 mm. 



Stations 4791 and 4792, off Bering Island, June 14, 1906, in 76 

 and ^2 fathoms. U. S. Nat. Mus., 110,479. 



A larger but imperfect specimen measures 60 mm. 



This form recalls T. spitsbcrgcnsis Reeve, but has a finer and less 

 elevated sculpture and different color. 



Subgenus PLICIFUSUS Dall 

 TRITONOFUSUS (PLICIFUSUS) POLYPLEURATUS Dall, n. sp.. 



Shell small, thin, with a smooth polished nucleus and seven or 

 more subsequent strongly ribbed whorls ; color pale purplish brown, 

 lighter on the ribs; the latter are numerous (18 on the seventh 

 whorl), narrow, irregularly oblique, with subequal interspaces; spiral 

 sculpture faint, visible only on the earlier part of the spire ; whorls 

 evenly rounded, suture distinct ; aperture semilunar, pillar white,, 

 callous ; outer lip simple, slightly expanded ; canal defective. Lon. 

 of shell, 29 -f- ; maximum diameter, 12.5 mm. 



Station 4996, in 86 fathoms, Sea of Japan. U. S. Nat. Mus., 

 110,476. 



A small, slender shell, with close, prominent, rather irregular, 

 oblique riblets, not stopping abruptly at the edge of the base, as in 

 T. kroyeri, which with the same number of whorls would be twice as 

 long. 



TRITONOFUSUS (PLICIFUSUS) EL^ODES Dall, n. sp. 



Shell slender, acute, with a distinct suture, eight moderately 

 rounded whorls, covered with an axially striated nearly smooth, pale 

 olive-gray periostracum over a white or purplish substratum; apex 

 eroded; subsequent whorls sculptured almost exactly like Buccinum 

 tome, with about (on the penultimate whorl) 16 axial, irregular,. 



