no. 1820. NEW SHELLS FROM BERMUDA— BALL AND BARTSCH. 279 



forming a prominent carina at the anterior termination of the pos- 

 terior two-fifths of the space between the sutures. The surface of 

 the shell between the anterior suture and the shoulder is marked by 

 six equal and equally-spaced very slender spiral threads, while the 

 space between the shoulder and the summit is smooth. Beginning 

 with the fifth whorl the shoulder becomes less apparent and finally 

 loses its angulation altogether. The posterior two-fifths between the 

 sutures, however, remains smooth, while the anterior three-fifths 

 retains the six raised threads. Entire surface of the shell marked by 

 exceedingly fine incremental lines. Sutures strongly constricted. 

 Periphery of the last whorl feebly angulated. Base short, moder- 

 ately rounded. Aperture subquadrate, somewhat effuse anteriorly; 

 posterior angle obtuse; outer lip very thin, showing the external 

 markings within; columella almost straight and slightly revolute. 



The type has seven post-nuclear whorls and measures: Length, 

 2.1 mm.; diameter, 0.6 mm. It was collected in Bermuda and is in 

 the Bermuda Museum. The minute sculpture is not indicated on 

 the figure. 



TURBONILLA (CARELIOPSIS) BERMUDENSIS, new species. 

 Plate 35, fig. 4. 



Shell very small, exceedingly slender, very elongate-conic, white. 

 Nuclear whorls about one and one-half, planorboid, well rounded, 

 having their axes at right angles to that of the succeeding turns, upon 

 the first of which they rest without being immersed. Post-nuclear 

 whorls high between the sutures, feebly shouldered at the summit, 

 well rounded, marked by exceedingly fine incremental lines and about 

 19 somewhat sinuous, slender, depressed, rounded, spiral threads, 

 which are a little wider than the incised lines that separate them. 

 Sutures strongly constricted. Periphery of the last whorl well 

 rounded. Base rather long, well rounded, marked like the spire. 

 Aperture elongate-oval; posterior angle acute; outer lip thin, show- 

 ing the external sculpture within. Inner lip slightly curved and 

 slightly reflected over the base. 



Three specimens of this species (Cat. No. 221614, U.S.N.M.) were 

 collected by Mr. Haycock in Bermuda. The type has six post-nuclear 

 whorls and measures: Length 2 mm., diameter 0.4 mm. This is the 

 second species of Careliopsis known from the Atlantic coast of America. 

 The first, Turbonilla (Careliopsis) siyliformis Morch, was described by 

 Morch * from material collected by A. H. Riis at St. Thomas, West 

 Indies, the measurements of which are more than double the dimen- 

 sions of the present form. 



1 Malakozoologische Blatter, 1874, p. 108. 



