Dall — New Shells from the Northwest Coast. 251 



Height 22; of last whorl 16; diameter 10 mm. U. S. N. Mus. Cat. No. 

 46,728. Monterey, California, Stearns. 



N od u I us palmeri, new species. 



Shell minute, translucent brownish with a blunt apex and four well 

 rounded whorls; the suture rather deep, the surface smooth except for faint 

 incremental lines ; base imperforate, aperture lunate, simple, the margin en- 

 tire and continuous Height 2, diameter 0.75 mm. U. S. N. Mus. Cat. 

 No. 212,731. St. Paul Island, Bering Sea; W. Palmer. 



Cryptonatica aleutica, new species. 



Shell large, rounded, slightly flattened in front of the suture pinkish 

 white, covered with a light brownish, spirally minutely striated periostra- 

 cum, a white area surrounding the umbilical region; whorls six or more, the 

 nucleus minute; aperture lunate, simple, the body with a coat of enamel, 

 the umbilicus completely, smoothly filled with a semilunate pad of callus ; 

 operculum solidly calcareous, smooth, with an obscure swelling centrally. 

 Height 46; diameter 40 mm. U. S. N. Mus. Cat. No. 217,156. Unalaska, 

 Aleutian Islands. 



This is the shell which has long been confounded with and distributed 

 under the name of Natica russa Gould, but the discovery of Gould's type 

 shows that it is a much smaller and different species. 



Skeneopsis alaskana, new species. 



Shell minute, resembling S. planorbis Fabricius, but smaller, more ele- 

 vated and with a much smaller umbilicus ; whorls two and a half, pale green- 

 ish white, rounded, suture deep, not appressed; sculpture only of more or 

 less evident concentric fine wrinkles, more conspicuous on the top of the 

 whorl; aperture circular, simple, umbilicus deep, width about one-fifth of 

 the diameter of the last whorl; operculum horny, multispiral. U. S N. Mus. 

 Cat. No. 271,717. St. Paul Island, Bering Sea; A. G. Whitney. 



Pantellaria, new genus. 



Type Megerlia monstruosa Scacchi. 



In this group the opening for the pedicel in intact specimens is wholly 

 in the flat or sessile valve, as in Platidia; when a portion of it appears to in- 

 volve the other valve it is due to wear. These two genera are unique in 

 this respect in the group. P. echinata Fischer and Oehlert also belongs to 

 this genus. The species are West African, Mediterranean and Antillean. 



