AUT. 18 SMALL SHELLS DREDGED BY ' * ALBATEOSS ^ ^ DALL 37 



MANGILIA 7 CHASMATA, new species 



Shell small, slender, white, the aperture about half the length, with 

 a blunt smooth nucleus of a whorl and a half, and three and a half 

 subsequent whorls; suture appressed and slightly coronated by the 

 swollen ends of the ribs; the fasciole slightly constricted, its anterior 

 edge forming an angular shoulder; axial sculpture of (on the last whorl 

 about 20) narrow rather straight rounded ribs with equal or wider inter- 

 spaces crossing the whorls, flexuous on the fasciole; spiral sculpture 

 none, even the back of the canal is smooth; aperture narrow, the canal 

 hardly differentiated, the anal sulcus wide and shallow, the pillar 

 straight, attenuated in front, axis impervious. Length, 5.5; diameter, 

 2 mm. U. S. Nat. Mus. Cat. No. 107964. 



Off Fernandina, 20 specimens. 



MANGILIA LASTICA, new species 



Shell small, slender, whitish, the aperture about one-third the 

 whole length, with a smooth nucleus of one and a half to two whorls 

 and seven subsequent well rounded whorls; suture distinct, not ap- 

 pressed, the fasciole in front of it flattish and sloping; the sculpture 

 varying in strength in different individuals; usually stronger on the 

 earlier whorls; axial sculpture of numerous protractively oblique nar- 

 row ribs with subequal interspaces, flexuous but not prominent (as 

 a rule) on the fasciole and absent from the base, the incremental lines 

 inconspicuous; spiral sculpture of two equal threads just behind the 

 suture, but not equally obvious in all the specimens, especially the 

 young; in those with strong sculpture there are two or three more 

 or less evident small threads overriding the ribs, but in all j^oung 

 cases the base is smooth, the ribs stopping abruptly; in the fully adult 

 there may be a few obsolete spirals on the base, and a few evident 

 ones on the canal; aperture subovate with a wide and short canal; 

 outer lip protractively arcuate, the anal sinus shallow and wide; the 

 pillar short, attenuated in front, axis impervious. Length, 11; diam- 

 eter, 4 mm. U. S. Nat. Mus. Cat. No. 107967. 



Off Fernandina, 25 specimens. 



A variety, with stronger sculpture has a short nucleus, and the 

 spirals continuous over the base, the two near the suture less evi- 

 dent. 



MANGILIA ? TACHNODES, new species 



Shell small, lucid white, slender, with a very short nuclear whorl 

 and five and a half subsequent whorls; suture distinct, constricted, 

 not appressed, the fasciole in front of it flattish, its anterior edge 

 angular, forming a conspicuous shoulder to the whorls; axial sculp- 

 ture of (on the last whorl about 25) threadlike ribs, stronger on 

 the earlier whorls, with subequal interspaces, crossing from suture to 



