CLASS GASTROPODA 
257 
which extends from the inner edge of the columella to the posterior angle 
of the aperture. Length, 5.5; diameter, 2.2 mm. (Dali.) 
Type in United States National Museum, No. 40932. Type locality, 
Bering Island. 
Range. Commander, Aleutian, and Shumagin Islands, Alaska. 
Cerithiopsis stejnegeri dina Bartsch, 1911 
Plate 70, fig. 7 
Proceedings of the United States National Museum, 40:343; PI. 40, fig. 7. 
This is the southern representative of C. stejnegeri, differing from the 
species in having the sculpture much more strongly pronounced and in 
being larger. Length, 7; diameter, 2.6 mm. (Bartsch.) 
Type in United States National Museum, No. 195175. Type locality, 
Sitka, Alaska. 
Range. Known only from type locality. 
Cerithiopsis grippi Bartsch, 1917 
Plate 67, fig. 12 
Proceedings of the United States National Museum, 52:669; PI. 46, fig. 12. 
Shell of medium size, chestnut brown. Nuclear whorls four and one- 
half, smooth, well-rounded, forming a moderately elevated apex which is 
transparent. Post-nuclear 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. Intercostal 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 prominent 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 
between 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 between 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 two 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 incremental lines and much finer spiral striations. 
Aperture of irregular shape, decidedly channeled anteriorly; posterior 
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