NEW MARINE MOLLUSKS FROM BERMUDA. 



By Paul Bartsch, 



Assistant Curator, Division of MoUusks, U. S. National Museum. 



Some time ago the United States National Museum received a lot 

 of mollusks for determination from Mr. Arthur Haycock, collected by 

 him at Bermuda. Among these were quite a number of new species, 

 which were described by Dr. Wilham H. Dall and the present writer 

 in the Proceedings of the U. S. National Museum, vol. 40, pp. 277 to 

 288, pi. 35, May, 1911. Since then several other lots have been ex- 

 amined, and among these the following new forms were found: 



CERITHIOPSIS HERO, new species. 



Plate 28, fig. 1. 



Shell large, elongate-conic, chestnut brown, nuclear whorls at least 

 3, well rounded, smooth, scarcely increasing in size, forming a cylin- 

 dric apex; post-nuclear whorls moderately rounded, ornamented 

 with 3 strong spiral cords, and quite regular somewhat retractive 

 axial ribs. Of the axial ribs, 16 occur upon the first and second; 18 

 upon the third; 20 upon the fourth; 22 upon the fifth to ninth; 24 

 upon the tenth, and 26 upon the penultimate turn. The intersections 

 of the axial ribs and the spiral cords form strong tubercles, of which 

 those on the cord at the summit are somewhat elongated and well 

 rounded, while those on the median and supra-sutural cords are trun- 

 cated posteriorly, sloping gently anteriorly. Sutures strongly chan- 

 neled. Periphery of the last whorl marked by a channel as broad as 

 that which separates the supra sutural from the median spiral cord. 

 This channel is crossed by the continuation of the axial ribs, which 

 terminate at the posterior border of the flattened spiral cord, that 

 bounds the sulcus anteriorly. Base slightly concave, marked by a 

 very feeble spiral cord at the insertion of the columella. Entire sur- 

 face of spire and base marked with numerous very fine lines of growth, 

 and exceedingly fine spiral striations. Aperture irregularly oval, 

 strongly channeled anteriorly and feebly so at the posterior angle; 

 outer lip rendered decidedly sinuous by the spiral cords; columella 

 very stout, somewhat curved, and partly covered by the reflected 

 inner lip; parietal wall covered with a thick callus. 



Proceedings U. S. National Museum, Vol. 41— No. 1861. 



303 



