call] new species of shells 157 



Subgenus ANCISTROLEPIS Dall 



CHRYSODOMUS (ANCISTROLEPIS) UNICUS (Pilsbry) 

 Buccinum unicum Pilsbry, Proc. Acad. Nat. Sci. Phila., 1905, p. 102. 



This species, originally referred to Buccinum, is a member of 

 this group of very buccinoid form, but B. taphrium Dall, the type of 

 the subgenus Sulcosinus, has a light, delicate, small shell with a 

 heavy, reflected, callous margin to the outer lip, and a more buc- 

 cinoid canal than any of the species yet shown to belong to Ancistro- 

 lcpis; so, until the operculum and its anatomy are known, it seems 

 imprudent to merge Sulcosinus with Ancistrolcpis, though the almost 

 channeled suture is very similar. 



CHRYSODOMUS (ANCISTROLEPIS) DAMON Dall, n. sp. 



Shell elongate, solid, six-whorled, with almost exactly the same 

 sculpture as C. unicus, but much more attenuated and larger ; the 

 periostracum is dark brown, originally finely axially lamellose, but 

 when worn appearing smooth or even polished; canal and pillar 

 shorter than the aperture, the canal wide, much recurved; pillar 

 twisted but not pervious, callous, bluish white like the rest of the 

 inside of the aperture. Lon. of shell, 80; of last whorl, 55 ; of aper- 

 ture 37 ; max. lat. of shell, 40 ; of aperture, 20 mm. 



Station 5038, in 175 fathoms, October 2, 1906, on the south coast 

 of Yesso. U. S. Nat. Mus., 110,474. 



This shell has an extraordinarily close resemblance in sculpture 

 to C. unicus, while differing essentially in form, being related to 

 the latter much as C. grainiuatiis is to C. cucosuiius. The effect of 

 wear upon the appearance of the periostracum is very deceptive ; 

 shells which appear when worn to have a polished surface frequently 

 were originally more or less villous. 



A specimen of C. (Ancistrolcpis) magiius Dall 128 mm. long was 

 dredged at station 5021 in y^ fathoms, east coast of Sakhalin Island, 

 Sea of Okhotsk. 



CHRYSODOMUS (ANCISTROLEPIS) HIRASEI (Pilsbry) 



Buccinum hirasei Pilsbry, Proc. Acad. Nat. Sci. Phila., 1901, p. 391, pi. 

 xx, fig. 22. 



This fine species, originally described from a dead shell under the 

 name Buccinum Jiirasci, is certainly a member of the subgenus of 

 Chrysodomus, described by me in 1895 under the name of Ancistro- 

 lcpis. The only difference noted is that the periostracum is smooth 

 instead of villous when worn. This group is now found to be rather 



