162 BULLETIN OF THE 



to fourteen little raised hardly flexuous transverse waves extending clear across 

 the whorls, rounded, equal throughout their length, and separated hy shallow 

 slightly wider interspaces ; this transverse sculpture becomes gradually fainter, 

 and entirely obsolete on the last whorl, which in the adult seems only marked 

 by the fine and slightly irregular incremental lines which give to the thin 

 smooth pale brown and slightly fibrous epidermis a silky appearance ; spiral 

 sculpture of numerous very fine close half-obsolete grooves or scratches, and 

 six or seven deeper stronger grooves encircling the canal ; whorls mostly 

 flattened, the last slightly rounded ; suture distinct, appressed; aperture white, 

 the outer lip thin, sharp, with no lirce on the typical specimen ; column with 

 three plaits, the anterior one faint; canal short, nearly as wide as the aperture, 

 hardly recurved ; siphonal fasciole distinct ; soft parts whitish, with no oper- 

 culum. Lon. of shell (nuclear whorls lost), 35.0; of last whorl, 17.0; of 

 aperture, 12.0 ; max. lat. of shell, 9.0 mm. 



Habitat. 100 miles S. E. by S. h S. from Cape Fear, N. C, in 528 fras., 

 yellow mud, bottom temperature 38°. 7 F. Dredged by U. S. Fish Commission 

 steamer Albatross, one living specimen, at Station 2628. 



The soft parts are so contracted that they could not be extracted without 

 breaking the shell. This species looks a good deal like a Terehra in form. 

 None of the described species at all resemble it. 



Mitra (Thala?) torticula n. s. 



Plate XV. Figr. 8. 



Shell elongated, acute, pale yellowish, paler toward the extremities, with a 

 dehiscent thin fibrous epidermis, its axial line somewhat convex toward the 

 right ; nucleus glassy, white, mammillate, of two whorls ; other whorls about 

 six, of which the last forms more than half the shell ; sculpture of (on the last 

 whorl) 12 rounded straight ribs, widest near the periphery, extending across 

 the whorls and fainter near the suture and on the canal ; these are crossed by 

 about (on the last whorl) 16 rounded even threads, which pass over the ribs 

 and interspaces without any marked nodulation and are separated by wider 

 interspaces; suture not impressed ; aperture narrow ; outer lip thin and simple 

 except for slight crenulation due to the sculpture; columella straight, acute 

 anteriorly ; no callus on the body or pillar ; plaits two, distinct but not strong. 

 Lon. of shell, 12.2; max. lat. of shell, 4.0 mm. Soft parts dried up within 

 the shell, inaccessible, but apparently without an operculum. 



Habitat. One living specimen from off Havana, Cuba, in 400 fms., bottom 

 and temperature not determined. 



The form of this shell (apart from its departure from a straight line) recalls 

 Mangilia more than Mitra; the Wo plaits are well inside, so that they would 

 seem to be true plaits, and not mere callosities. It is possible that it should 

 be referred to Cordieria, but the aspect is more like Mitra. Its permanent 

 place will depend on the results of the future dismemberment of the doubtless 

 now heterogeneous group named Thala by H. & A. Adams, 



