346 PROCEEDINGS OF UNITED STATES NATIONAL MUSEUM. 



become evanescent in some specimens, and especially on the last wboii, 

 though the facets persist. The riblets do not usually pass on to the base, 

 which is rounded, inflated, and, except for the rather strong and not 

 very regular transverse sculpture, is smooth or has no revolving sculp- 

 ture; mouth rounded, canal very short, columella shorter than the aper- 

 ture, slightly twisted, outer lip thin, sharp, regularly arched ; the upper 

 whorls show the three ridges with their facets or granules, the posterior 

 decidedly smaller than the other two; suture distinct. Lon. of shell, 

 5.5; of last whorl, 2.5; of aperture, 1.6 ; max. lat. of shell, 2.0'"'". 



Habitat: Unalashka, Atka, and Amchitka Islands, of the Aleutian 

 chain, Dall, 1871-4; Bering Island, one specimen, Stejneger, 1882, col- 

 lector's number, 1496. Mus. Cat. 40932. 



This species was first found by the writer in the Aleutian Islands, 

 where it frequents the canals of the yellow incrusting "bread" sponges, 

 which are very common between low and extreme lowest water marks, 

 and resemble the adult form of the genus Cliona. I have never found 

 it except by breaking up these sponges. One dead but perfect speci- 

 men was collected by Dr. Stejneger. 



The species appears most like G. indchella Jeffreys, of Britain, but 

 has fewer whorls, a rounded instead of an excavated base, is less deli- 

 cate, and differs in small details of sculpture. None of the Californian 

 forms are like it. 



Purpura lima Martyn. 



Not uncommon. T)\y shells and egg cases from Bering Island. Col- 

 lector's number, 2779. Mus. Cat. 40933. 



Trophon truncatus Strom. 



T. truncatus Strom. G. O. Sars, Moll. Arct. Norv., fig. 9. 



Bering Island. Collector's number, 2786. Also from Petropavlovsk, 

 Kamchatka, 2629. Mus. Cat. 40934. 



Strombeila callorlima Dall, var. stejncgeri (pi. II, figs. 5, 6). 



One fresh specimen from the beach at Bering Island. It is slightly 

 more elongated than the original specimen from the Callorhinus rook- 

 ery at St. Paul Island, Pribiloff Islands, and presents other characters, 

 which, if constant, would separate it perhaps specifically. The shell has 

 five and a half whorls (the nucleus is gone) and presents indications of 

 about nine obscure irregular transverse ribs ; the surface sculpture where 

 preserved is fine and sharp, like that of Chrysodomus kroyeri; the epider- 

 mis pale brown, extremely thin, and dehiscent. Tbe shell has a gray- 

 ish green tint, perhaps i)artly from a confervoid growth, the aperture 

 as in my figure of Stromhella callorMna, the margin inside yellowish, the 

 throat livid white, the columellar side with a touch of dull purple. Lon. 

 of shell, 60.0; of last whorl, 40.0; of aperture, 28.5'°'". Max. lat. of 

 shell, 25.0; of aperture, 16.5'"'". Mus. Cat. 40935. 



It is a ^little singular that both the known specimens should come 



