^RT. 18 SMALL, SHELLS DREDGED BY " ALBATROSS '' DALL 29 



front; canal short, wide, outer lip thin, arcuate. Length, 5.2; diame- 

 ter, 3.3 mm. U. S. Nat. Mus. Cat. No. 107945. 



Five specimens off Fernandina. 



Probably immature but quite characteristic. 



MANGELIA? IPARA Dall 



Pleuroioma {Mangilia) ipara Dall, Bull. Mus. Comp. Zool., vol. 9, p. 57, 

 Aug., 1881; vol. 18, No. 29, pt. 2, p. 115, pi. 11, fig. 14, June, 1889. 



Two young specimens off Fernandina. Also from the Yucatan 

 Strait in 640 fathoms and near Martinique in 502 fathoms. 

 This species may belong to the genus Gymnohela. 



MANGILIA? SERICIFILA, new species 



Shell minute, pale buff, with a brown Sinusigera nucleus of three 

 and four subsequent well rounded whorls; suture appressed with a 

 fine thread in front of it; anal sulcus wide and shallow, leaving a wide 

 fasciole, arcuately striated behind it; in front of the fasciole there is 

 an obscure shoulder to the whorl; axial sculpture of incremental lines, 

 most conspicuous on the fasciole, and a double row of obscure undu- 

 lations at the periphery, most marked on the earlier whorls; spiral 

 sculpture of 10 or 12 equal, small threads in front of the periphery 

 with narrow interspaces; base evenly rounded, canal short, wide; the 

 pillar straight, attenuated in front; aperture ovate, the outer lip thin, 

 arcuate. Length, 4; diameter 1.5 mm. U. S. Nat. Mus. Cat. No. 

 108302. 



One specimen off Georgia. 



A variety from the same locality has the peripheral undulations 

 absent and evenly rounded and spirally sculptured whorls, giving 

 somewhat the aspect of an Astyris. 



MANGILIA (SERICIFILA, var.?) STRONGYLA, new 



Shell resembling sericifila in size and general aspect, but with the 

 whorls evenly rounded and covered with spiral sculpture of equal and 

 equally distributed close set small threads. The axis is minutely per- 

 vious. U. S. Nat. Mus. Cat. No. 107943. 



One specimen off Georgia, and a dozen off Fernandina. 



PLEUROTOMELLA? STEARINA, new species 



Shell small (immature?), thin, of a greasy translucent white, with a 

 hrown Sinusigera nucleus of three, and three subsequent, rapidly 

 enlarging whorls; suture appressed with gathered axial wrinkles in 

 front of it; anal sulcus shallow and wide, distally rounded, the fasci- 

 ole wide, slightly constricted, arcuately striated; axial sculpture of 

 from 12 to 15 short, rounded, obliquely arcuate ribs with subequal in- 

 terspaces, confined to the region between the fasciole and the periph- 

 ery of the whorl; the lines of growth are obscure; spiral sculpture 



