356 PROCEEDINGS OF THE NATIONAL 3IUSEUM. vol.41. 



Albatross at station 2813 in 40 fathoms, on coral sand bottom, bottom 

 temperature 81°, Galapagos Islands. The type has 4 post-nuclear 

 whorls and measures: Length 2 mm., diameter 1.2 mm. 



ALVANIA CLARIONENSIS, new species. 



Plate 32, fig. 4. 



Shell very elongate-ovate, milk white. Nuclear whorls one and 

 one-third, well rounded, smooth. Post-nuclear whorls strongly, 

 concavely shouldered at the summit on all but the last turn, where 

 the summit is rounded. Beginning with the posterior termination 

 of the anterior fourth between the sutures, the shell slopes suddenly 

 toward the suture, forming a strong angle at the widest portion of each 

 whorl. In addition to the above, the whorls are marked by strong, 

 decidedly protractive, axial ribs which are about one-fourth as wide 

 as the spaces that separate them. Of these ribs, 14 occur upon the 

 first, 16 upon the second, 18 upon the third and the penultimate turn- 

 In addition to the axial sculpture, the whorls are marked by slender, 

 spiral lirations of which the one at the suprasutural angle is the strong- 

 est, the rest being equal. Of these cords, only the one marking the 

 suprasutural angle is present on the first turn, while on the second a 

 slender cord bounds the channeled summit and a few feeble lirations 

 are indicated between this and the strong suprasutural cord; on the 

 third turn five spiral lirations are apparent between the summit and 

 the suprasutural cord. The space between the suprasutural cord 

 and the suture appears to be devoid of sculpture on the first three 

 whorls; on the penultimate whorl the supraperipheral angle and the 

 shoulder at the summit are lost, and the six spiral cords which appear 

 between the summit and the periphery are about half as wide as the 

 spaces that separate them, being equal and equally spaced and much 

 stronger than on the preceding turn. Here, too, the first two basal 

 cords become apparent in the suture. All the junctions of the spiral 

 cords and axial ribs are feebly tuberculated, excepting those formed 

 by the suprasutural cord and the ribs ; these are strongly tuberculated 

 on the first three whorls. On the last whorl the spiral cords appear 

 superimposed upon the axial ribs. Suture decidedly channeled. 

 Periphery of the last whorl marked by a broad sulcus which bears 

 two raised, spiral threads. The first basal cord being considerably 

 more elevated than the sulcus, lends the anterior edge of the base an 

 angular aspect. Base decidedly produced, weakly rounded, marked 

 by eight equal and equally spaced spiral cords, which are about one- 

 third as wide as the spaces ' that separate them. Aperture very 

 oblique, effuse anteriorly; posterior angle obtuse; outer lip thin at 

 the edge, reenforced immediately behind the edge by a very strong 

 varix; inner lip very stout, reflected over and appressed to the base; 



