24 SMITHSONIAN MISCELLANEOUS COLLECTIONS VOL. 9I 



Type. — U.S.N.M. no. 430930, collected at station 23 in 260 to 360 

 fathoms between latitude i8°32'i5" N., longitude 66° ly'^s" W. and 

 latitude i8°32' N., longitude 66°2i'i5" W. It has 12 whorls and 

 measures : Length, 22.6 mm ; diameter, 6.2 mm. 



U.S.N.M. no. 430505 contains three specimens from the same 

 station. 



U.S.N.M. no. 430534 contains one specimen from station i in 400 

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



U.S.N.M. no. 430660 contains one specimen from station 35 in 180 

 to 80 fathoms between latitude i8°23'4o" N., longitude 67°i6'45" W. 

 and latitude i8°24'45" N., longitude 67°i4'i5" W. 



LEPTODRILLIA SPLENDIDA, n. sp. 



Plate 7, figs. 2, 5, 7 



Shell small, elongate-conic, shiny. Nuclear whorls 1.5, well rounded, 

 smooth. Postnuclear whorls moderately well rounded with strongly 

 developed axial ribs, which begin weakly at the summit of the whorls 

 and become strongest at about the anterior termination of the pos- 

 terior third, again gradually weakening on the base and evanescing on 

 the columella. These ribs on the early whorls are cusped at their 

 highest elevation. On the later whorls the cusps become less pro- 

 nounced. Ten occur upon all but the last whorl, which has twelve. 

 There is a very strong varix a little distance behind the outer lip. The 

 lines of growth are exceedingly fine, and the spiral sculpture is absent 

 on all but the columella, thus giving to the entire surface of the shell a 

 decidedly glassy appearance. On the anterior two thirds of the colu- 

 mella nine slender spiral threads are present. Aperture rather broad, 

 decidedly channeled anteriorly and posteriorly. The posterior chan- 

 nel is at the summit of the whorl and is deeply incised. The outer lip 

 from the channel to the slender notch anteriorly is protracted into a 

 clawlike element. Inner lip appressed to the columella as a heavy cal- 

 lus that extends over the parietal wall and forms a decided knob 

 over the posterior angle. 



Type. — U.S.N.M. no. 429368, dredged at station 56, Samana Bay, 

 in 17 fathoms between latitude i9°io'i5" N., longitude 69°27'2o" W. 

 and latitude i9°io'i5" N., longitude 69°28'o5" W. It has a little more 

 than eight whorls and measures: Length, 9.5 mm; diameter. 3.1 mm. 



U.S.N.M. no. 429752 contains four specimens from station 10, in 

 120 to 160 fathoms between latitude i8°29'2o" N., longitude 66°05' 

 30" W., and latitude i8°3o'24" N., longitude 66°04'i5" W. 



This species differs from LeptodrilUa loria in being in every way 

 larger and in having much larger nuclear whorls. 



