14 SMITHSONIAN MISCELLANEOUS COLLECTIONS VOL. 9I 



U.S.N.M. no. 430494 contains two specimens from station loi in 

 190 to 300 fathoms between latitude i8°4o'3o" N., longitude 64° 50' 

 W. and latitude i8°45'4o" N., longitude 64°48' W. 



U.S.N.M. no. 430931 contains two specimens dredged at station 23 

 in 260 to 360 fathoms between latitude i8°32'i5" N., longitude 66° 

 i7'45" W. and latitude i8°32' N., longitude 66°2i'i5" W. 



GLYPHOSTOMA (GLYPHOSTOMA) EPICASTA, n. sp. 



Plate 4, figs. 4, 7, 9 



Shell rather large, elongate-conic, milk-white. Nuclear whorls 

 almost 3, the first one well rounded, the other two with a strong 

 submedian keel. Postnuclear whorls rather low, well rounded, marked 

 by axial ribs that evanesce in the sulcus below the summit, and on 

 the last whorls evanesce as they pass over the base. Of these ribs, 10 

 occur upon the first four. 12 upon the fifth and sixth, 14 upon the 

 seventh and eighth, 18 upon the ninth, and 20 upon the last turn. In 

 addition to the axial ribs the entire surface of the shell is well marked 

 by lines of growth, which on the sulcus below^ the summit are strength- 

 ened to form a series of wrinkles more numerous than the axial ribs. 

 The spiral sculpture consists of well-developed cords, which are slightly 

 flattened and which are about one third as wide as the spaces that 

 separate them. The intersection of the axial ribs and spiral cords is 

 rendered nodulose, the long axes of the nodules coinciding with the 

 spiral sculpture. Of these spiral cords, one is present on the first turn, 

 two on the second to sixth, three on the seventh, and seven on the 

 remaining. Beginning with the eighth whorl, finer spiral threads are 

 apparent in the sulcus below the suture, and these increase in number 

 with the turns. On the last turn there are six. Suture moderately 

 constricted. Periphery well rounded. Base rather long, well rounded, 

 marked like the posterior portion of the last whorl, five spiral threads 

 being present. Columella rather long, marked by lines of growth and 

 1 1 spiral threads, which become consecutively a little less strong from 

 the posterior anteriorly. The entire surface of the shell is rather 

 coarsely granulatedly sculptured. Aperture rather long, decidedly 

 channeled posteriorly and anteriorly. Outer lip reinforced by a strong 

 varix a little beyond the edge, the portion of the lip between the varix 

 and edge being reflected over the aperture as a clawlike element. The 

 inner edge of the thickened varix within the aperture bears seven 

 strong denticles. The inner lip is also denticulated. Here the denticles 

 are less strong and more numerous. About, 15 are present in the type. 

 Columella well covered by a moderately thick callus, which is strength- 



