NO. l6 NEW MARINE MOLLUSKS COREA 7 



CARINODRILLIA (BUCHEMA) APITOA, n. sp. 

 Plate I, figs. I, 2 ; plate 2, fig. 6 ; plate 3, fig. 2 



Shell of medium size, elongate-conic, yellow. Nuclear whorls 2.3, 

 the first 2 well rounded, smooth, the last .3 marked by fine axial lira- 

 tions which pass into slender, evenly spaced axial riblets, slightly 

 retractively curved at the summit, which in turn pass into the adult 

 sculpture. 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 whorl. Of 

 these ribs, which are about as wide as the spaces that separate them, 

 eight occur upon the first and second, nine upon the third and fourth, 

 and eight upon the last. In addition, the entire surface of the shell is 

 marked by fine incremental lines. The spiral sculpture on the first 

 postnuclear whorl may be worn, at least it is not apparent. Beginning 

 with the second and continuing over all the whorls there is a moder- 

 ately strong cord a little anterior to the summit. From the third whorl 

 on, two spiral cords pass over the axial ribs between which two much 

 slenderer cords are present on the fourth and last whorls. In addi- 

 tion, there are fine spiral lirations on the posterior sinal region and 

 between the cords anterior to the sinus. About 15' may be counted on 

 the last turn between the humps marking the posterior limit of the ribs 

 and the moderately strong cord at the summit. Periphery of the last 

 whorl well rounded. Base short, moderately round, marked by three 

 spiral cords which are a little weaker than those on the spire, the 

 space between the first of which and the cord posterior to it is marked 

 by four spiral lirations. Between the first and second basal cords there 

 are five lirations, and four between the second and third. Columella 

 stout, marked by six strong spiral cords which are about a third as 

 wide as the spaces that separate them. The spaces between these cords 

 are also marked by feeble spiral lirations. Aperture pear-shaped, 

 strongly channeled anteriorly and posteriorly, the outer lip protracted 

 into a clawlike element between the anterior limit of the posterior sinus 

 and the stromboid notch, and provided with a heavy varix a slight 

 distance behind its edge. 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. 



Type. — U.S.N.M. no. 430037, collected at station 104 in 80 to 120 

 fathoms between latitude i8°3o'4o" N., longitude 66°i3'2o" W. and 

 latitude i8°3o'io" N., longitude 66°i3'5o" W. It has 7.8 whorls and 

 measures : Length, 9.9 mm ; greater diameter, 4.8 mm. 



U.S.N.M. no. 429625 is an additional specimen collected at sta- 

 tion 55 in 17 fathoms. 



