AKT. 18 SMALL SHELLS DREDGED BY '' ALBATROSS ^^ DALL 105 



TRICHOTROPIS (IPHINOPSIS) TURRITA, new species 



Shell minute, slender, tiirrited, white, with five or more whorls, 

 exclusive of the (lost) nucleus; suture very distinct, the whorls with a 

 narrow angular shoulder; surface with faint incremental lines; whorls 

 in front of the shoulder flattish; probably in fresh specimens with a 

 fugacious periostracum; base acutely attenuated with a deep narrow 

 umbilicus with a carinate margin; aperture sub triangular, with a 

 narrow projection approaching a canal; margins of the aperture thin, 

 simple, the pillar lip smooth and nearly straight. Length, 3; diam- 

 eter, 1.5 mm.; length of the last whorl, 2 mm. U. S. Nat. Mus. Cat. 

 No. 107986. 



Off Fernandina, two specimens. 



This species has much the same form in miniature as T. horealis 

 Sowerby has on a larger scale. 



Family RISSOINIDAE 



Genus RISSOINA Orblgny 



RISSOINA MAYORI, new species 



Shell small, white, strongly sculptured, of about 6 moderately con- 

 vex whorls; suture distinct, not deep; coronated by the blunt ends of 

 the ribs; axial sculpture of (on the last whorl 16) strong rounded ver- 

 tical ribs with narrower interspaces, crossing the whorls; the ribs 

 are nearly in a continuous series up the spire; spiral sculpture of 

 extremely fine, close, even striation covering the shell; base rounded 

 aperture evenly ovate, the peristome simple, thickened, crossing the 

 body by a bridge of callus. Length, 4; diameter, 1.8 mm. U. S. 

 Nat. Mus. Cat. No. 108371. 



Off Georgia, one specimen. Also off Miami, Fla., in 58 fathoms; 

 Henderson. Named in honor of the late Dr. A. G. Mayor, of the 

 Tortugas Biological Station. 



Family TRUNCATELLIDAE 



Genus TRUNCATELLA Risso 



TRUNCATELLA. species 



A broken specimen of this genus was found off Fernandina, doubt- 

 less washed in from the shore. U. S. Nat. Mus. Cat. No. 108050. 



Family RISSOIDAE 



Genus RISSOA Freminville 



RISSOA POMPHOLYX, new species 



Shell small, thin, fragile, white, with a glassy nucleus of about one, 

 and nearly three subsequent well rounded whorls; suture distinct, 

 deep; axial sculpture of a few minute wrinkles chiefly on the early 

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