1*89 J PROCEEDINGS OF THE NATIONAL MUSEUM, 341 



Family TURBINID.-E. 



Genus ASTRALIUM Link. 



Astralium americanum Gnieliu. 



Collected at the Abrolhos Islands, Brazil, and extending thence 

 northward to Florida. 



Family TBOCHIDJE. 

 Genus OMPHALIUS Philippi. 



Omphalitis fasciatus Born, (var.) 

 Collected at the Abrolhos Islands. 



Genus CANTHARIDUS Montfort. 

 Subgenus IIALISTYLUS Dall. 



Shell small, cylindrical, holostomate, polychromatic; opercnlnm multi- 

 spiral, coriaceous; dental formula 7T4 - r ^,r ; type, R. columna Dall. 



This group differs from Leiopyrga iu its holostomate aperture and 

 absence of spiral sculpture. 



Halistylus columna sp. nov. 



Plate ix, Fig. 7. 



Shell small, subcyliudrical, blunt-tipped, polished; yellow, brown, 

 salmon-colored, bluish gray, or streaked or banded with these colors; 

 seven whorled; apex flattish; nucleus not differentiated, small ; whorls, 

 after the second, nearly equal in diameter; suture much appressed, the 

 whorl somewhat constricted in front of it; sculpture only of faint incre- 

 mental lines; base rounded; aperture rounded ovate, slightly oblique; 

 outer lip continuous with the pillar, which is raised, arched in harmony 

 with the lip, but not reflected; no umbilicus; lip simple, hardly thick- 

 ened; a little callus on the body and in the posterior angle between the 

 lip and body; throat simple, very slightly pearly; operculum circular, 

 externally shaggy, with many whorls; animal with long slender tenta- 

 cles; the eyes black, on separate rather long peduncles ; epipodial line 

 indicated by four or six short stout papilla'; foot short and broad; 

 muzzle rather large and long, a. little indented in the middle line; me- 

 dian and admediau teeth simple, with narrow straight stems, and simple, 

 wide, mushroom-like cusps; uncini numerous, filiform ; ad median teeth 

 four, the outer ones the larger; stems and bases of the middle part of 

 the radula so small and thin as to be difficult to distinguish ; maximum 

 longitude of shell, 5.8; maximum latitude, 1.9; longitude of aperture, 



J Omni 



Hab. — Station 2702, off Eio Janeiro, in 59 fathoms, mud ; temperature 

 57° F. ; Stations 2704 and 2765, off the Rio tie la Plata,, in 10 to 12 fath- 

 oms, sand. 



