NO. 2295. A-^;j/ NORTH PACIFIC MOLLUSKS—DALL. 347 



is smooth and there is no umbilicus. Height of (decollate) shell, 35; 

 of last whorl, 14; diameter, 13 mm. U. S. Nat. Mus. Cat. No. 224134. 



Type-locality. — U. S. Fish Commission station 3253, off the Pribi- 

 lof Islands, Bering Sea, in 51 fathoms, mud; bottom temperature, 

 39.5° F. 



? TACHYRHYNCHUS PRATOMUS, new species. 



Shell small, yellowish white, acute, with a glassy swollen nucleus of 

 about one whorl and six subsequent whoils; suture distinct, not deep, 

 axis imperforate; early whorls moderately convex, the periphery near- 

 er the succeeding suture, with numerous low rounded rather irregular 

 ribs extending from suture to suture, with subequal interspaces; 

 these ribs become gradually obsolete on the later whorls; spiral sculp- 

 ture of low, u'regularly distributed partially obsolete threads, with 

 minute threadlets between them, this sculptm-e covers the entire 

 whorl; base convexly regularly rounded with no umbilical depres- 

 sion; aperture ovate, simple, the lips sharp, with no callosities on the 

 body; height, 10; diameter, 4mm. U. S. Nat. Mus. Cat. No. 219369. 



Type-locality. — Semidi Islands, Alaska, at station 1152, in 20 

 fathoms, gravel, collected by W. H. Dall. 



This is obviously not a typical TacJiyrhynchus , but in the absence 

 of the operculum and soft parts I am unwiUing to refer it to a new 

 group. It may be related to the New England CoutJiouyella or to 

 Bittium. 



■; TACHYRHYNCHUS STEARNSIi, new species. 



Shell small, slender, acute, white or pale brownish, with a minute 

 subglobular mucleus and about 10 subsequent well-rounded whorls, 

 regularly increasing in size; suture distmct, not appressed; spiral 

 sculpture of (on the spire three, on the last whorl four) low prominent 

 lines about equally spaced above the base, and minute almost micro- 

 scopic close-set spirals in the interspaces and on the convexly rounded 

 base; axial sculptm-e not perceptible; aperture rounded, simple, the 

 outer lip somewhat arcuate, the body thinly glazed; height of shell, 

 13; diameter, 4.5 mm. U. S. Nat. Mus. Cat. No. 74014. 



Type-locality. — San Pedro, California, Stearns Collection. 



This was regarded as a new species of Mesalia by Doctor Carpenter, 

 but I have always had some (perhaps unwarranted) suspicion that 

 the shell is exotic. 



TURRITELLOPSIS (ACICULA variety) STJMPSONI, new name. 



Twritellopsis acicula G. O. Sars, Moll. Reg. Arct. Norv., p. 186, pi. 10, fig. 14 

 a— 6.; pi. 7, fig. 2 a-e; pi. 18, fig. 25, 1878; not of Stimpson, Shells of New 

 England, p. 35, pi. 1, fig. 5, 1851. 



A comparison of the figures of Stimpson and Sars, both elegant 

 and accurate draftsmen, shows at once that there is a wide differ- 

 ence between them. T. acicula is more slender, with a looser coil and 



