348 PROCEEDINGS OF THE NATIONAL MUSEUM. vou 41. 



reenforced immediately behind the edge by a strong varix; inner 

 Up short, very stout, reflected over the attenuated base; parietal 

 wall covered with a thick callus, which renders the peritreme com- 

 plete. 



The type and two other specimens (Cat. No. 207590, U.S.N.M.) 

 were dredged by the United States Bureau of Fisheries steamer 

 Albatross at station 2808, near the Galapagos Islands, in 634 fathoms 

 on coral sand bottom, with a bottom temperature of 39.9°. The 

 type has 4 post-nuclear whorls and measures: Length 3.3 mm., 

 diameter 1.9 mm. 



ALVANIA NEMO, new species. 



Plate 30, fig. 8. 



Shell ovate, white. Nuclear whorls two and one-half, marked by 

 two very strong, spiral keels which are separated by a sulcus as 

 broad as the keels. Post-nuclear whorls well rounded, marked by 

 low, rounded, slightly retractive, axial ribs, 14 of which occur upon 

 all the turns. In addition to the axial sculpture, the whorls are 

 marked by a low, poorly developed, rounded, spiral cord at the 

 summit, and two considerably stronger cords — separated by a 

 narrow channel — a little anterior to the middle of the whorl. On 

 the penultimate whorl a slender, si3iral cord appears, halfway between 

 the one at the summit and the first one below it. The spaces inclosed 

 between the spiral cords and axial ribs are squarish pits at the summit 

 on all the whorls except the penultimate and last, whese an inter- 

 calated spiral cord renders them oblong. The spaces between the 

 two strong, spiral cords and the axial ribs are very long, narrow pits, 

 having their long axes parallel to the spiral sculpture, while the 

 spaces inclosed between the last spiral cord, the suture, and the 

 axial ribs are also squarish in form. Suture moderately constricted. 

 Periphery of the last whorl marked by a broad sulcus, which is 

 bounded anteriorly by a strong spiral cord. This sulcus is crossed 

 by the continuations of the axial ribs which terminate at the posterior 

 edge of the basal spiral cord. Base produced anteriorly, very 

 slightly rounded, marked by eight low, poorly developed, flattened 

 spiral cords, of which the one immediately below the periphery is the 

 strongest. Aperture broadly oval; posterior angle obtuse; outer lip 

 very thick, reenforced immediately behind the edge by a strong 

 varix; inner lip very oblique, curved, reflected over, and appressed 

 to the base; parietal wall covered with a thick callus, rendering the 

 peristome complete. 



The type and three other specimens (Cat. No. 195011, U.S.N.M.) 

 were dredged by the United States Bureau of Fisheries steamer 

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

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

 nuclear whorls and measures: Length 2.6 mm., diameter 1.2 mmo 



