NO. 2 NEW TURRITID MOLLUSKS BARTSCH I 5 



ened into a decided denticle opposite the posterior termination of the 

 internal callus of the outer lip, thus almost constricting the posterior 

 channel into a tube, the outer portion of the parietal callus from the 

 denticle to the posterior angle of the aperture being decidedly thickened. 



Type. — U.S.N.M. no 430507. 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. It has almost 13 whorls 

 and measures: Length, 31 mm; diameter, 10 mm. 



U.S.N.M. no. 429580 contains two specimens from station 32 

 dredged in 200 to 280 fathoms between latitude i8°25'5o" N., longi- 

 tude 67°i4'55" W. and latitude i8°23'5o" N., longitude 67°i7'35" W. 



U.S.N.M. no. 429668 contains two specimens from station 25 

 dredged in 240 to 300 fathoms between latitude i8°32'i5" N., longi- 

 tude 66°22'io" W. and latitude i8°32'o5" N., longitude 66°22'io" W. 



U.S.N.M. no. 430536 contains one specimen from station i in 360 

 to 600 fathoms at latitude i8°33'45" N., longitude 66° 15' W. 



This species is the largest of the West Indian Glyphostomas. 



GLYPHOSTOMA (GLYPHOSTOMA) ELSAE, n. sp. 



Plate 4, figs. I, 3, 6 



Shell broadly conic, yellowish white, with the tip horn-colored and 

 the spiral cords of the postnuclear whorls pale chestnut -brown, fading 

 as they cross the ribs. On the base the spiral cords are. interrupted 

 by the much more numerous ribs, which gives them a catenated effect. 

 The tip of the base is brown for about one fifth of its length, but 

 an area of equal width posterior to this lacks the brown inter- 

 rupted bands. The interior of the aperture is bluish white. Nuclear 

 whorls three, the first well rounded, the other two marked by a 

 strong acute spiral keel a little anterior to the middle of the whorls. 

 Postnuclear whorls well rounded, marked by exceedingly strong, 

 broad, almost humplike axial ribs, which become very attenuated in 

 the posterior sinal region and evanesce at the suture. Of these ribs, 

 ID occur upon all but the last whorl, which has 12. The intercostal 

 spaces are a little wider than the ribs. At the summit of the whorls 

 in the posterior sinal region the shell is marked by rather strong, 

 closely spaced, curved riblets, which give to this part a crenulated 

 aspect. On the base additional riblets are intercalated so that one. 

 two, or even three slender axial ribs may appear between the heavy 

 knobs described above. These are of very regular strength and spacing 

 and are rendered nodulose by the spiral threads. The yellowish white 

 nodules furnish a decided contrast to the dark areas that separate 



