356 PROCEEDINGS OF THE NATIONAL MUSEUM. vol.40. 



axial ribs which terminate at the posterior border of the first basal 

 keel. Base moderately long, somewhat concave, marked by three 

 strong, sublamellar keels, the first of which borders the peripheral 

 sulcus, while the other two are a little less strong and situated close 

 together on the middle of the base. Aperture large, subquadrate, 

 decidedly channeled anteriorly; posterior angle obtuse; outer lip 

 rendered sinuous by the external sculpture which is apparent within 

 the aperture; columella moderately long, curved, and twisted. 



The type, which is at Amherst College, Massachusetts, has nine 

 post-nuclear whorls and measures: Length 3,25 mm., diameter 1.13 

 mm. It and another specimen were collected by Prof. C. B. Adams 

 at Panama. 



CERITHIOPSIS PARAMOEA, new species. 

 Plate 38, fig. 4. 



Shell moderately large, broadly elongate-conic, brown. (Nuclear 

 whorls decollated.) Post-nuclear whorls appressed at the summit, 

 ornamented with three nodulose, spiral cords which are about as 

 wide as the spaces that separate them. The first of these is at the 

 summit, the third is on the anterior fourth between the sutures, 

 while the second is halfway between the two. In addition to the 

 spiral cords, the whorls are marked by axial ribs almost equalling 

 the spiral cords 'in strength; of these ribs, 16 occur upon the first and 

 second, 18 upon the third, 20 upon the fourth, 22 upon the fifth, and 

 32 upon the penultimate turn. The junctions of the axial ribs and 

 spiral cords form nodules which on the early whorls are well rounded 

 and on the last elongate, their long axes corresponding with the axial 

 sculpture. The spaces inclosed between them are well rounded 

 pits. Sutures moderately impressed, showing the posterior edge 

 of the first basal cord. Periphery of the last whorl marked by a 

 sulcus almost as wide as that separating the supraperipheral from 

 the median cord, and, like it, crossed by the continuations of the 

 axial ribs. Base well rounded, smooth except for the feeble cord 

 immediately below the peripheral sulcus. Aperture irregularly oval, 

 decidedly channeled anteriorly; posterior angle obtuse; outer lip 

 rendered somewhat sinuous by the external sculpture; columella 

 short, curved, with the free edge reflected; parietal wall glazed with 

 a thin callus. 



The type (Cat. No. 15582, U.S.N.M.) comes from Neah Bay, 

 .Washington. It has lost the nucleus and probably the first one 

 and a half post-nuclear turns. The eight remaining whorls measure: 

 Length 6.3 mm., diameter 2.1 mm. 



