NO. 2295. MEW NORTH PACIFIC MOLLUSKS-—DALL. 319 



33) fine regular sharp striae with wider flat interspaces, for the most 

 part uniform, but near the periphery tending to be wider, this sculp- 

 ture covering the whole surface; aperture wide, semilunate, outer lip 

 gently arcuate, thin, inner lip erased, white, pillar straight, attenuated 

 in front, canal wide, deep, very short, with a well-marked siphonal 

 fasciole; height of shell, 30; of last whorl, 22; of aperture, 15; diameter, 

 16 mm. U. S. Nat. Mus. Cat. No. 213337. 



Tyije-localiiy . — U. S. Fish Commission station 3333, off Iliuliuk 

 Harbor, Captains Bay, Unalaska, Aleutian Islands, in 19 fathoms, 

 mud; bottom temperature 43.9° F. 



AULACOFUSUS (LIMATOFUSUS) TROPHIUS, new species. 



Shell of moderate size, short, white, with a pale olivaceous perios- 

 tracum with more than five well-rounded whorls, the apex eroded; 

 suture distinct, not appressed; axial sculpture of faint concavely 

 arcuate incremental lines; spiral sculpture of (on the penultimate 

 whorl about a dozen) sharp narrow channeled grooves, with consid- 

 erably wider flat interspaces, which, on the last whorl, are more or 

 less divided by a shallow median groove; this sculpture is practically 

 uniform over the whole surface; aperture wide, simple, wdiite within; 

 outer lip slightly reflected, thin, body erased; piUar short, straight; 

 axis pervious; height of shell, 32; of last whorl, 26; of aperture, 21; 

 d ameter, 19 mm. U. S. Nat. Mus. Cat. No. 122628. 



Type-locality. — U. S. Fish Commission station 3071, in 685 fathoms, 

 mud, off Sea Lion Rock, coast of Washington. 



AULACOFUSUS (LIMATOFUSUS) MOKDITUS, new species. 



Shell small, solid, polished, of about seven whorls, the apex decorti- 

 cated, rather acute, the whorls moderately rounded, the suture dis- 

 tinct, not appressed; axial sculpture of feeble incremental lines, their 

 intersections slightly punctating the grooves; spiral sculpture of num- 

 erous shallow grooves with much wider flattish interspaces over the 

 whole surface; outer lip thin, sharp, arcuate; inner lip erased, pinkish, 

 piUar white, attenuated in front; canal wide, distinct, short, slightly 

 recurved; height of shell, 28; of last whorl, 20; of aperture, 15: diame- 

 ter 13 mm. U. S. Nat. Mus. Cat. No. 222599. 



Type-locality. — -U. S. Fish Commission station 4198, in the Gulf 

 of Georgia, in 200 fathoms, mud; bottom temperature, 48.6° F. 



There are numerous irregular branching grooves on the surface, 

 like the burrows of Cliona, but I regard them as abnormal and 

 probably due to some parasite. The operculum is normal. 



AULACOFUSUS (LIMATOFUSUS) DIMIDIATUS, new species. 



Shell small, white, with a pale olivaceous periostracum, with five 

 or more rounded whorls (the apex defective and the specimens not 

 quite mature) separated by a rather deep suture; spiral sculpture 



