NO. l6 NEW MARINE MOLLUSKS COREA 5 



The periphery of the last whorl is marked by a spiral cord which is 

 equal in strength to the five posterior to it. Base stout, moderately 

 long, marked by the continuation of the axial ribs, and three spiral 

 cords. There are eight spiral lirations between the periphery and the 

 first basal cord, five between the first and second cords, and six 

 between the second and third. Columella stout, moderately long, 

 marked by seven spiral cords which are of the same strength as those 

 on the base. Between the last basal and first columellar cord there are 

 lo spiral lirations. Nine spiral lirations are present between the first 

 and second columellar cords, nine between the second and third, five 

 between the third and fourth, four between the fourth and fifth, 

 three between the fifth and sixth, and two between the sixth and 

 seventh. Aperture moderately long, deeply channeled anteriorly and 

 posteriorly, the posterior sinus falling a little anterior to the summit. 

 The outer lip is protracted between the anterior channel and the 

 posterior sinus into a clawlike element. There is a heavy varix a 

 little beyond the edge of the outer lip. The inner lip is reflected over 

 the columella as a heavy callus which extends over the parietal wall 

 and forms a knob at its junction with the outer lip which projects 

 into the posterior sinus. 



Type. — U.S.N.M. no. 430160, collected at station 16 in 38 fathoms 

 between latitude i8°29'4o" N., longitude 55°o8'3o" W. and latitude 

 i8°3i'oo" N., longitude 66° lo'i 5" W. It has 6.5 whorls and mea- 

 sures: Length, 12.3 mm ; greater diameter, 4.5 mm. 



U.S.N.M. no. 430851 is a single specimen from the type locality. 



CARINODRILLIA (BUCHEMA) MAMONA, n. sp. 



Plate 2, figs. 2, 3, 5 ; plate 3, fig. 4 



Shell of medium size, elongate-conic, yellowish horn-colored. Nu- 

 clear whorls 2.8, the first 2.6 well rounded, smooth, the last .2 marked 

 by three slender equally spaced axial riblets which are slightly retrac- 

 tively curved at the summit. Postnuclear whorls rounded, marked 

 by heavy, humplike axial ribs which evanesce in the posterior sinal 

 region, attaining their greatest development on the anterior two-thirds 

 of the whorls. Of these ribs, which are separated by spaces about 

 equal to them, nine occur upon the first and second, and eight upon 

 the remaining whorls. In addition, the shell is marked by fine incre- 

 mental lines. The spiral sculpture consists of strong spiral cords 

 which pass over the heavy axial ribs. Of these cords, two occur upon 

 the first and second, two upon the third with the appearance of a third 

 cord posterior to the others, and three upon the remaining whorls. 



