ART. 18 SMALL SHELLS DREDGED BY " ALBATROSS '' DALL 39 



ulous at the shoulder; spiral sculpture hardly discern able or none, 

 even on the canal; aperture narrow, anal sulcus feeble, canal hardly 

 differentiated; outer lip straight, thin and sharp; pillar straight atten- 

 uated in front, axis impervious. Length, 6.5; diameter, 2 mm. U. S. 

 Nat. Mus. Cat. No. 107937. 

 Abundant off Fernandina. 



MANGILIA FRITILLARIA, new species 



Shell small, slender, white, with a smooth nucleus of a whorl and 

 a half and three and a half subsequent whorls; suture distinct, ap- 

 pressed, coronated by the ends of the ribs in front, the fasciole slop- 

 ing, hardly constricted; axial sculpture of (on the last whorl about a 

 dozen) narrow nearly straight ribs, with wider interspaces, strongest 

 at the shoulder, obsolete on the base and toward the end of the last 

 whorl; spiral sculpture of (on the last whorl about 14) obsolete, close 

 set, hardly perceptible equal and equally distributed small threads 

 covering the whorl in front of the shoulder; aperture narrow, about 

 two-fifths the whole length, anal sulcus feeble, canal hardly differen- 

 tiated; pillar straight, attenuated in front, axis impervious. Length, 

 6; diameter, 2 mm. U. S. Nat. Mus. Cat. No. 107968. 



One specimen off Fernandina. 



This belongs to the same group as M. Christina, differing in details 

 of sculpture. Until we know the range of variation in these deep- 

 sea species it seems most convenient to treat marked differences as 

 specific. The whorls in this species are only moderately rounded 

 and distinctly angular at the shoulder. 



MANGILIA? SUBCIRCULARIS, new species 



Shell small, slender, thin, with a blunt apex, whitish, glistening; 

 with a swollen nucleus of a whorl and a half and four and a half 

 subsequent well rounded whorls; suture distinct, appressed, with a 

 smooth, hardly constricted fasciole in front of it; axial sculpture 

 chiefly of rather strong flexuous incremental lines and a few gradu- 

 ally obsolescent riblets on the earlier whorls; spiral sculpture of (on 

 the last whorl 18-20) fine prominent threads rising above the incre- 

 mental lines, with wider interspaces, covering the whole whorl in 

 front of the fasciole; aperture ovate, about one-third the whole length, 

 the anal sulcus forming nearly a semicircle, the outer lip thin and 

 arcuate, canal wide; pillar twisted, attenuated in front; axis imper- 

 vious. Length, 8.0; diameter, 2.7 mm. U. S. Nat. Mus. Cat. No. 

 333450. 



Two specimens off Georgia. 



The thin, glistening shell and rotund whorls are its conspicuous 

 characters. 



