PROCEEDINGS OF THE NATIONAL MUSEUM. 



ANAPLOCAMUS BOREALIS, new species. 



Shell short, rude, of about four and a half whorls (the apex In each 

 specimen eroded), smooth, except for lines of growth and darker lines, 

 which might indicate resting stages; whorls somewhat Hattened above 

 and near the apex, more or less appressed at the suture; periphery 

 rounded, or, in the younger shells, obscurely angular; base full, smooth, 

 with no indication of an umbilicus or axial depression; aperture sub- 

 ovate, pointed in front or behind; outer lip thin, sharj), simple; pillar 

 rather thick, white, with a smooth, well-marked callus over the body; 

 operculum dark brown, with strong incremental lines. Height of 

 (somewhat eroded) shell, 17; of last whorl, 15; of apertui-e, 10; major 

 diameter of shell, 13; of aperture, 7 mm. 



Pacific Ocean, south of Unimak Island, in 01 fathoms, mud, C. H. 

 Townsend. 



Tiipe.—^o. 122592,11. S. N". M. 



This very remarkable shell recalls a fresh-water genus at once, and 

 would easily be overlooked amid a quantity of Anculosa dilafata. But, 

 when studied, it is seen to l)e unlike any fresh-water form or any 

 marine form hitherto known. It is probably referable to the family 

 Trichotropidai, as the peculiar production of the aperture, the thick 

 brown epidermis, and the curious operculum all have points in common 

 with species of Trichotropis. 



SOLARIELLA NUDA, new species. 



Shell Turbinate, recalling Margarita^ smooth, polished, except for 

 obscure spiral markings which do not interrupt the surface, of about 

 four whorls; color, white, with a pink or blue nacre glowing through; 

 whorls rounded, flattened in front of the suture; base rounded; um- 

 bilical margin keeled; umbilicus wide, funicular; aperture rounded, 

 oblicpie, hardly angulate by the umbilical rib, and with a very short 

 interruption between the inner and outer lips; operculum light brown, 

 thin, with about ten whorls. Height, 15; major diameter, 19; minor 

 diameter, 15.5 mm. 



U. S. Fish Commission stations 2928, 3187, and 3318, in 298 to 155 

 fathoms, oft' Lower California. 



Tijpe.—^o. 122580, U. S. N. M. 



SOLARIELLA CERATOPHORA, new species. 



Shell thin, with a pale olive, silky epidermis, and six whorls beside 

 the (decollate) nucleus; early whorls smooth, gradually taking on two 

 rows of projecting points or sharp nodules, which are, on the later 

 whorls, connected by a slender spiral thread; periphery with a slender 

 granular thread, on which tlie suture is laid; base with five simdar 

 threads, closer as they approach the umbilicus; umbilicus small, verti- 



