l6o SMITHSONIAN MISCELLANEOUS COLLECTIONS [VOL. 50 



low, rounded ribs, with mostly wider interspaces extending irregu- 

 larly beyond the periphery more or less on to the base ; the posterior 

 part of the whorls show a few faint, nearly obsolete, small spiral 

 ridges, but the base is sharply spirally sulcate; aperture semilunar; 

 body and pillar smooth, the pillar twisted, almost pervious ; the canal 

 short, wide, strongly recurved ; outer lip thin, sharp, possibly a little 

 reflected in the adult. Lon. of shell, 54; of last whorl, 34; of aper- 

 ture, 25 ; maximum diameter of shell, 22 ; of aperture, 1 1 mm. 



Station 501 1, in 42 fathoms, September 25, 1906, Aniwa Bay, 

 Sakhalin Island. U. S. Nat. Mus., 110,477. 



Recalling the young of T. kroyeri, but showing on careful inspec- 

 tion a different color and sculpture. 



TRITONOFUSUS (PLICIFUSUS) RHYSSUS Dall, n. sp. 



Shell of moderate size, white below a pale olivaceous periostracum ; 

 of five or six moderately rounded whorls, the apex defective, the 

 suture very distinct, but not channeled ; axial sculpture of faint, some- 

 what irregular, low, short wrinkles, beginning in front of the suture, 

 more sparse and feeble on the last whorl and disappearing at or near 

 the periphery of the whorls ; spiral sculpture of fine, close, sharp, 

 equal stri?e, with the wider interspaces rounded, about three to a 

 millimeter, covering the whole surface ; aperture semilunar, inter- 

 nally white, a thin callus on the body and pillar; outer lip thin, 

 slightly expanded ; pillar straight, its anterior edge a little gyrate ; 

 canal short, wide, a little recurved, fasciole inconspicuous. Lon. of 

 shell, 49; of last whorl, 35; of aperture, 25; maximum diameter of 

 shell, 20; of aperture, 10 mm. 



Station 5013, in 43 fathoms, September 2, 1906; U. S. Nat. Mus., 

 110,489; also at station 501 1, in 42 fathoms, both stations in Aniwa 

 Bay, Sakhalin Island. 



The wrinkling, though not as profuse, and the color of the shell 

 recall those of Buccinum tenue. 



TRITONOFUSUS (PLICIFUSUS) AURANTIUS Dall, n. sp. 



Shell of orange-yellow or salmon-colored understratum, covered 

 with a thin chalky layer under an olive-gray periostracum, usually 

 much eroded, with five or six whorls and a very distinct but not 

 channeled suture ; surface with numerous fine flattish close-set 

 threads, with narrower channeled interspaces, about four to a milli- 

 meter, covering the whole surface, but a little fainter in front of the 

 suture ; aperture ovate, the outer lip thin, concavely flexuous behind, 

 produced in front, the body and throat pale-orange color, the body 



