362 PROCEEDINGS OF THE NATIONAL MUSEUM. vol. 40." 



the apices, though intact, were of a gelatinous consistency, and, 

 when removed from the alcohol in which the shells were preserved, 

 dried up, shriveled, and fell off. 



CERITHIOPSIS STEPHENS^ Bartsch. 

 Plate 39, fig. 7. 



Cerithiopsis stephensi Bartsch, Proc. U. S. Nat. Mus., vol. 37, 1909, pp. 399-400, 

 fig- 

 Shell elongate-conic, chocolate brown. (Nuclear whorls decol- 

 lated in all the specimens seen.) Post-nuclear whorls well rounded, 

 ornamented spirally by four keels between the sutures, of which the 

 posterior three are strong and tuberculate, the fourth smooth and 

 slender. Axially the whorls are marked by irregular ribs, the 

 junctions of which with the spiral keels form tubercles. The posterior 

 row of tubercles is at the summit and is the weakest, the individuals 

 appearing as rounded knobs. The second is on the middle of the 

 whorl. This and the first, which is immediately above the peripheral 

 sulcus, have their tubercles of about equal strength. On these two 

 keels the tubercles slope gently anteriorly and very abruptly posteri- 

 orly. The peripheral sulcus and the other two sulci are equally 

 strong and wide. All are crossed by the ribs, which, however, do 

 not extend over the base. Both spiral cords and ribs are crossed by 

 strong incremental lines. Sutures constricted. Periphery of the 

 last whorl marked by a deep channel. Base well rounded, rather 

 short, marked by strong incremental lines and a few very fine spiral 

 striations. The summit of the succeeding whorl drops a little below 

 the peripheral sulcus in all the whorls of the spire and allows a nar- 

 row margin of the smooth base to appear as a cord in the suture. 

 Aperture ovate, with a strong anterior sinus, outer lip thin, showing 

 the external sculpture within; columella stout, twisted and curved, 

 having a weak basal fasciole at its insertion. 



Type.— Cat. No. 204008, U.S.N.M. It has twelve post-nuclear 

 whorls and measures: Length 9 mm., diameter 2.1 mm. It and 

 two additional specimens in Mrs. Kate Stephens's collection were 

 collected by her at Bear Bay, Peril Strait, Baranoff Island, Alaska. 

 Four more were collected by her at Mole Harbor, Alaska, one of which 

 is in the collection of the U. S. National Museum (Cat. No. 204009). 

 Another in her collection comes from the head of Port Frederick, 

 ChichagofF Island, Alaska. 



Cat. No. 126659, U.S.N.M., contains three specimens from Victoria, 

 Vancouver Island, British Columbia. Cat. No. 133233, U.S.N.M., 

 contains five specimens from Port Orchard, Puget Sound, Wash- 

 ington. 



Named for Mrs. Kate Stephens, of San Diego, California. 



