124 AMERICAN JOURNAL 



the Ochotsk Sea. I think, with von Martens, that it is quite 

 distinct from coriacea, Pallas, which has a much rounder and 

 less produced shape. It is interesting to note that it is not 

 always, though usually coriaceous, one of the specimens before 

 me having the whole interior lined with a cretaceous deposit 

 which forms a solid shell in about half of the specimen. This 

 shell is white, and marked with revolving ridges and strise. 

 This specimen is one of the largest I have seen, and measures 

 1-1 by -9 in. 



Velutina prolongata, Cpr. 



I have obtained this species from Unga Island, Sitka and Fort 

 Simpson. It extends southward to Monterey. 



Velutina haliotoidea, Fabr., Moll. = Velutina laevigata, Pen- 

 nant. 

 This species ranges from the Arctic Ocean to Monterey, usu- 

 ally smaller than Atlantic specimens. 



NATICID^E. 

 AMAUROPSIS, Moerch. 

 Amauropsis purpurea, n. s. ? 



Shell elongate-globose, covered with a yellowish epidermis; 

 color purple brown, when weathered purplish white. Whorls 

 four, inflated, globose. Suture deeply canaliculated. Aperture 

 more than half as long as the shell ; outer lip thin ; columella 

 white, thickened, rounded; a thin callus on the inner lip. Um- 

 bilicus closed, or a mere chink. Spire very short, bluntly 

 rounded. Sculpture of numerous close, very fine revolving 

 grooves, and a few inconspicuous ridges. 



Lon. 1-0, lat. -8 in. 



Habitat, St. Michael's Norton Sound, Alaska Territory ; 

 abundant, dead and alive, on the beach at low water mark and 

 below it. 



The species is somewhat variable in length, some specimens 

 being more elongated than others. The depth of color also 

 varies somewhat. 



It appears to differ from A. helicoides, Johnst., in its sculp- 

 ture and color, and is usually more globose. A. canaliculata, 

 Gld., is very similar in form, but is described as smooth. Dr. 

 Carpenter considers it as distinct ; and a specimen kindly com- 

 pared with those in the British Museum, was stated to be differ- 

 ent from any in that collection, by Mr. Dawson. 



