NO. 2193. WEST AMERICAN MARIXE MOLLUSKS—BARTSCH. 669 



The type and three paratypes, Cat. No. 225185, U.S.N.M., were 

 collected by the U. S. Bureau of Fisheries steamer Albatross, at 

 station 4205, in 60 fathoms, on mud bottom; bottom temperature 

 47.6° in Queen Charlotte Sound, British Colimibia. The type, 

 which has lost the first 2 nuclear whorls, has 7| postnuclear turns 

 and measures — length, 5 mm.; diameter, 1.7 mm. The nuclear 

 Avhorls were described from one of the paratypes. 



CERITHIOPSIS (CERITHIOPSIS) GRIPPI, new species. 



Plate 46, fig. 12. 



Shell of medium size, chestnut brown. Nuclear whorls 4|, smooth, 

 well rounded, forming a moderately elevated apex, which is trans- 

 parent. Postnuclear whorls narrowly shouldered at the summit, 

 moderately rounded in the middle, decidedly contracted from the last 

 spiral cord to the suture, marked by slender, slightly retractive axial 

 ribs, of which 14 occur on the first, 16 upon the second and third, 

 18 upon the fourth and fifth, and 20 upon the remaining turns. In- 

 tercostal spaces about half as wide as the ribs. In addition to this 

 axial sculpture, the whorls are marked by three strong spiral cords, 

 of which the one at the summit is a trifle weaker than the other two. 

 The junction of the axial ribs and the spiral cords form very prom- 

 inent, well rounded tubercles, of which those on the first and median 

 cords are well rounded, while those on the third cord are truncated 

 posteriorly and sloped gently anteriorly. The spaces inclosed be- 

 tween the cords and the axial ribs are well-rounded, well-impressed 

 pits. Suture almost channeled. Periphery of the last whorl marked 

 by a broad groove, which is a little wider than the groove be- 

 tween the median and the third cord. The axial ribs extend across 

 this groove, but stop at its anterior limit. Base short, well rounded, 

 marked by 2 strong spiral grooves, of which one is on the median 

 part, while the other encircles the insertion of the inner lip. The 

 entire surface of the spire and the base is marked by very fine in- 

 cremental lines and much finer spiral striations. Aperture of irreg- 

 ular shape, decidedly channeled anteriorly; posterior angle very 

 obtuse ; outer lip somewhat effuse, rendered decidedly sinuous at the 

 edge by the external sculpture; columella very strong; inner lip re- 

 flected and appressed to the columella. Parietal wall covered by a 

 thin callus. 



The type and another specimen. Cat. No. 250632, U.S.N.M., were 

 collected by Mr. Gripp, in 15 fathoms, outside of kelp, off San Diego 

 Bay, California. The type has 8| postnuclear whorls and measures — 

 length, 4.7 mm. ; diameter, 1.2 mm. Two additional specimens in 

 Mr. Gripp's collection were examined. 



