NO. IO MOLLUSKS BARTSCH AND REHDER II 



stome, is rather broad with concentric lines. The interior is smooth, 

 except the well-impressed muscle scar. 



The type, U.S.N.M. no. 472853, measures: Length, 5.5 mm.; 

 greater diameter, 11.5 mm. ; lesser diameter, 9.9 mm. It, and a series 

 of specimens, U.S.N.M. no. 472551, were collected on Clipperton 

 Island on rocks along the shore south of the landing place. 



The basal aspect of this species recalls Hipponix serrata of the 

 western United States shores, but this has the lamellations more 

 crowded and more irregular and lacks the radial sculpture of that 

 species. 



TEGULA (CHLOROSTOMA) BARKERI, n. sp. 



Plate 2, figs. 10-12 



Shell small, broadly conic, of blackish brown ground color, with 

 numerous dots of bluish white on the spiral cords and 6 distantly 

 spaced, oblique axial zones of bluish white on the last whorl, which 

 are of irregular outline and extend from the summit to the periphery. 

 On the base the spiral cords are marked by alternate elongate zones of 

 light and dark, which are also arranged in a somewhat axial series. 

 The spaces between the spiral cords and the immediate area near the 

 umbilicus on the base are pale. The columella and parietal callus are 

 strikingly bright jade green, and the interior of the outer lip is pearly 

 gray. Nuclear whorls badly eroded. Postnuclear whorls well rounded, 

 marked by strong, well-rounded and elevated cords, of which 4 are 

 present upon the first, 5 upon the second, 7 upon the third, and 8 upon 

 the last between the summit and the periphery. The cords, as well as 

 the deep spaces that separate them, are marked by numerous, closely 

 spaced hairlike, retractively slanting, axial threads, which are best 

 shown in the grooves. Suture somewhat channeled. Periphery well 

 rounded. Base moderately convex, openly umbilicated and marked by 

 1 1 spiral cords which are not quite equal or equally spaced ; here also 

 the fine axial threads are present. The umbilical wall is smooth ex- 

 cepting a submarginal spiral cord. Aperture subcircular, decidedly 

 oblique ; the strongly arched outer lip is rendered crenulated by the 

 external sculpture ; the inner lip is decidedly sinuous and bears a 

 double denticle at the base of the columella ; a lesser one is present a 

 little anterior to these on the basal lip. 



The type, U.S.N.M. no. 472589, has 5.2 whorls and measures: 

 Length, 7.4 mm. ; greater diameter, 9.4 mm. ; lesser diameter, J.J mm. 

 It and a little older specimen, U.S.N.M. no. 472856, were collected at 



