436 PROCEEDINGS OF THE NATIONAL MUSEUM. vol.40. 



the early post-nuclear whorls. Post-nuclear whorls well rounded, ap- 

 pressed at the summit, sculptured with somewhat irregular, feebly 

 developed axial ribs, of which 18 occur upon the first and second, 

 20 upon the third and fourth, and 22 upon the penultimate turn. 

 Sutures strongly constricted. Periphery of the last whorl marked 

 by a very feeble, slender spiral cord. Base short, well rounded; 

 marked by the feeble continuations of the axial ribs. Aperture very 

 broadly ovate; posterior angle obtuse; outer lip very thin, showing 

 the external sculpture within; columella very slender, decidedly 

 curved and feebly revolute. 



The type (Cat. No. 94290, U.S.N.M.) was dredged by Doctor Rush 

 at his station 34 in 780 fathoms on coral mud off Cuba. It has 8 

 whorls and measures: Length 4 mm., diameter 1.1 mm. 



ACLIS RUSHI, new species. 

 Plate 59, fig. 3. 



Shell small, elongate-conic, white. Nuclear whorls two, well 

 rounded, smooth. Post-nuclear whorls inflated, appressed at the 

 summit, sculptured with fine incremental lines and an occasional 

 impressed varical streak. In addition to this there appear five very 

 fine subobsolete raised spiral threads between the sutures which lend 

 the surface a very weakly malleated appearance. Sutures very 

 strongly constricted. Periphery of the last whorl well rounded. 

 Base moderately long, narrowly umbilicated, well rounded, marked 

 like the spire. Aperture large, decidedly effuse anteriorly, with a 

 patulous expansion covering the posterior half of the outer lip; 

 posterior angle obtuse; outer lip thin, the portion immediately 

 anterior to the patulous part forming a claw; columella very long, 

 oblique, and very strongly reflected. 



Two specimens of this species (Cat. No. 82973, U.S.N.M.) were 

 dredged by Doctor Rush in 150 to 200 fathoms, off Fowey Rocks, 

 Florida Straits. The type has eight whorls and measures: Length 

 2.7 mm., diameter 1.2 mm. 



Named for Dr. W. H. Rush. 



ACLIS FLORIDANA, new species. 

 Plate 59, fig. 5. 



Shell small, elongate-conic. Nuclear whorls one and one4ialf, 

 well rounded. Post-nuclear whorls marked by a strong sloping 

 shoulder which extends over the posterior fourth of the whorls 

 between the sutures. This shoulder is limited anteriorly by a quite 

 strong carina. The anterior three-fourths of the whorls between 

 the sutures are well rounded, strongly constricted at the suture, and 

 appear sculptured by several very feeble spiral lines. The axial sculp- 

 ture consists of incremental lines and an occasional varical streak. 



