104 PROCEEDINGS OF THE NATIONAL, MUSEUM vol.70 



and 2 others, less conspicuous, at the margin of the moderately 

 rounded base; aperture rounded-quadrate, the outer lip thin, slightly 

 protractively oblique; the pillar short and wide, slightly recurved. 

 Height, 8.5; diameter, 2.5 mm. U. S. Nat. Mus. Cat. No. 87305. 

 Off Fernandina, one specimen. 



Genus SEILA A. Adams 



SEILA SUBALSIOA, new species 



Shell slender, flat-sided, white with pale brownish nebulosities, 

 with 16 subcylindrical whorls exclusive of the (lost) nucleus; 

 suture closely appressed, inconspicuous; axial sculpture only of incre- 

 mental lines chiefly visible in the interspaces; spiral sculpture of 3 

 equal strong plain cords on the sides of the whorls, the first close to 

 the suture, the second at the periphery, and the third between it and 

 the succeeding suture; there are 2 feeble threads at the margin of the 

 flattish base; aperture subquadrate, lips thin, the pillar twisted, short, 

 with a prominent edge; canal short, axis minutely pervious. Height, 

 9; diameter, 2 mm. U. S. Nat. Mus. Cat. No. 108070. 



Off Fernandina, three specimens. 



Family TRICHOTROPIDAE. 



Genus TRICHOTROPIS Sowerby. 



TRICHOTROPIS (IPHINOPSIS) NUDA, new species 



Shell small, bucciniform, thin, translucent white, with about four 

 roundly shouldered whorls; apex blunt, the suture distinct, not ap- 

 pressed; spiral sculpture of numerous, equally spaced, sharp striae 

 with flattened wider interspaces covering the whole surface; axial 

 sculpture of microscopically fine incremental lines; the last whorl 

 more than three-fourths as long as the whole shell; base somewhat 

 attenuated in front, with a deep narrow umbilicus with a hardly car- 

 inated margin; aperture semilunate, the margins thin, the outer lip 

 rounded, the inner lip straight partly overshadowing the umbilicus; 

 there is no indication of a canal. Length of shell, 6; of aperture, 3.5; 

 diameter, 3.5mm. U. S. Nat. Mus. Cat. No. 107988. 



Off Fernandina, three specimens. 



This shell, though small, has the form of IpMnoe and the columella 

 is entirely devoid of plaits. I suspect "Admete " injiata Friele, to 

 belong to the same group. At all events the Iphinoe Tcelseyi Dall 

 from off San Diego, Calif., certainly does. The small size, the 

 absence of the hairy periostracum found in IpJiinoe, and the deep 

 water habitat of these small shells, indicate the propriety of separating 

 them into a subgenus IpMnopsis ^ with /. Icelseyi as type. 



•See Proc. Biol. Soc. Wash., vol. 37, p. 88, Feb. 21, 1924. 



