504 PROCEEDINGS OF THE ACADEMY OF [Aug., 



revolving grooves separated by wider flattish interspaces, which, on 

 the last whorl, cover the whole surface, including the base; suture 

 distinct, not appressed; aperture short, the outer lip very thin, 

 sharp, the body without callus, the axis gyrate, minutely pervious; 

 the canal short, hardly recurved; operculum with a subspiral nucleus. 

 Length of shell 14; of last whorl 9; maximum (hameter 7.5 mm. 



Off the Kuril Islands, in 229 fathoms. 



This shell has the aspect of Thalassoplanes, hnt the operculum of 

 Mohnia. 

 Mohnia hondoensis n. sj.. 



Shell small, of about six whorls, whitish, covered by an olivaceous 

 periostracum; first two whorls denuded, the next with a peripheral 

 carina and about ten ribs which are prominent only at the periphery, 

 and as well as the carina become obsolete on the last whorl; there 

 are also faint microscopic spiral striae here and there; aperture 

 narrow, outer lip sharp, body erased; pillar gyrate, not pervious; 

 canal short, wide, slightly recurved. Length of shell 12; of last 

 whorl 9.5; maximum diameter 6 mm. 



Off Hondo, Japan, in 76 fathoms. 



The above species were dredged at various times liy the II. S. 

 Bureau of Fisheries steamer Albatross. 



