306 PROCEEDINGS OF THE NATIONAL MUSEUM. voi,. 4J. 



the remaining whorls. The intersections of the spiral cords and the 

 axial ribs form strong tubercles, of which those at the summit are 

 well rounded, while those of the supra-sutural spiral cord are some- 

 what truncated posteriorly. The spiral cord at the summit is white, 

 while the supra-sutural and median cords are brown. Periphery of 

 the last whorl marked by a tuberculated spiral cord, which is as strong 

 as its posterior neighbor, from which it is separated by a sulcus as 

 wide as that which separates the supra sutural from the median spiral 

 cord. Base moderately rounded, marked by two broad spiral cords, 

 of which the posterior is feebly tuberculated. The entire base is 

 light brown, the peripheral cord being of a little lighter shade of brown 

 than the base. Entire surface of the spire and base marked by numer- 

 ous very fine lines of growth and spiral striations. Aperture irregu- 

 lar, decidedly channeled anteriorly and posteriorly; outer lip pro- 

 duced into a clawlike element anteriorly; columella very stout and 

 twisted; inner lip adnate to the base of the shell; parietal wall cov- 

 ered with a thick callus, which joins the inner lip with the outer 

 at the posterior angle of the aperture rendering the peritreme 

 complete. 



Nine specimens of this species (Cat. No. 226452, U.S.N.M.) were 

 collected by Mr. Arthur Haycock at Bermuda. One of these, a 

 perfect individual, has 10 post-nuclear whorls, and measures: length 

 4.9 mm., diameter 1.5 mm. Another having 11 post-nuclear whorls 

 measures: length 6.1 mm., diameter 2 mm. 



EXPLANATION OF PLATE 28. 



Fig. 1. Cerithiopsis hero Bartsch, p. 303; cotype; long. 7.6 mm. 



2. Triphoris bermudensis Bartsch, p. 305; cotype; long. 4.9 mm. 



3. Cerithiopsis iontha Bartsch, p. 804; cotype; long. 2.1 mm. 



4. Triphoris bermudensis Bartsch, p. 305; cotype; long. 6.1 mm. 



5. Cerithiopsis cynthia Bartsch, p. 304; type; long. 3.9 mm. 



