318 PROCEEDINGS OP THE NATIONAL MUSEUM. vol.56. 



of (on the penultimate whorl about 17) regular narrow rather deep 

 grooves with much wider flattish interspaces, uniformly covering the 

 whole surface of the shell; aperture about twice as long as wide, outer 

 lip retractively arcuate behind and protractively anteriorly, not re- 

 flected; pillar lip with a thin glaze, pillar white; canal short, wide, 

 hardly reflected; height of shell, 40; of last whorl, 27; of aperture, 

 18; diameter, 18 mm. U. S. Nat. Mus. Cat. No. 108980. 



Type-locality. — Bermg Strait, near Port Clarence, W. H. Dall. 



COLUS (AULACOFUSUS) HALIDONUS, new species. 



Shell of moderate size, short, stout, white with an olivaceous peri- 

 ostracum, with about six whorls, the apex defective, suture distmct, 

 not appressed; axial sculpture of fine, equal, close-set incremental 

 lines; spiral sculpture of (on the penultimate v/horl about 16) fine 

 channeled grooves with wider flat interspaces, of which two behind 

 the suture are wider than the others; on the base the posterior edge of 

 these interspaces is raised and the anterior lowered to the level of the 

 bottom of the grooves giving the effect of narrow threads with much 

 wider intervals; these two varieties of sculpture cover the whole shell; 

 aperture wide, the outer lip somewhat reflected, body erased, pillar 

 short, gyrate, axis pervious; canal short, very wide, recurved and flar- 

 ing anteriorly; operculum nomial; height of shell, 35; of last whorl, 

 27; of aperture, 20; diameter, 20 mm. U. S. Nat. Mus. Cat. No. 

 213250. 



Type-locality, — Off Destruction Island, Washington, in 516 fath- 

 oms. 



AULACOFUSUS (LIMATOFUSUS) PULCIUS, new species. 



Shell of moderate size, of about six rounded whorls, the apex eroded, 

 shell substance of a pale livid brown, covered by an olivaceous perios- 

 tracum, the suture distinct and deep; axial sculpture of uniform fine 

 silky incremental lines; spiral sculpture of uniform flattened spirals 

 separated by narrow grooves, about 27 to 30 spirals on the penulti- 

 mate whorl; aperture ovate, outer lip thin (immature?) slightly 

 crenulated by the external sculpture, inner lip erased, brownish, 

 piUar white, straight; canal short, wide, deep, forming a weU marked 

 fasciole; height of shell, 38; of last whorl, 26; of aperture, 18; diam- 

 eter, 17 mm. U. S. Nat. Mus. Cat. No. 223799. 



Type-locality. — Arctic Ocean, north of Bering Strait, coUectod by 

 Capt. M. A. Healy of the revenue marine steamer Corwin. 



Operculum normal, dark brown. 



AULACOFUSUS (LIMATOFUSUS) TIMETUS, new species. 



Shell small, thin, with a thin pale olive periostracum, and five or 

 more whorls, the apex eroded; suture distinct, not appressed; axial 

 sculpture none; spiral sculpture of (on the penultimate whorl about 



