no. 1820. NEW SHELLS FROM BERMUDA— HALL AND BARTSCH. 281 



upon the third and fourth, 18 upon the fifth, 20 upon the sixth, 22 

 upon the seventh to tenth, 24 upon the eleventh and the penultimate 

 turn. Intercostal spaces about twice as wide as the ribs, well 

 impressed, evenly concave, marked with two series of strongly 

 impressed pits, of which one forms the anterior termination of the 

 impressed intercostal spaces, while the other is a little posterior to 

 the middle between the sutures. The remaining portions of the inter- 

 costal spaces are crossed by numerous, very fine, regular and regularly 

 spaced, incised spiral lines, that leave the spaces between them as 

 raised flattened spiral threads which are about twice as wide as the 

 incised lines. Of these incised lines, twenty-six occur between the 

 two pits on the last turn and twenty-five between the median series of 

 pits and the summit of the whorls. Sutures moderately strongly 

 impressed. Periphery of the last whorl well rounded. Base short, 

 well rounded, marked by incremental lines and thirty-three somewhat 

 wavy, slightly irregularly spaced, fine, incised, spiral lines. Aperture 

 subquadrate; posterior angle acute; outer lip thin, showing the exter- 

 nal markings within; columella almost straight and slightly re volute. 



Four specimens, cotypes, of this species were dredged at Bermuda. 

 One of these consists of the nucleus and five post-nuclear whorls, and 

 has furnished the description of the nucleus. Another has lost the 

 nuclear whorls and has twelve and one-half post-nuclear whorls 

 remaining; this measures: Length 7 mm., diameter 1.8 mm. 



Two of these are in the Bermuda Museum and two in the IT. S. 

 National Museum, where they are entered as Cat. No. 221611. 



This species and the following are related to Turbonilla (Striotur- 

 honilla) puncta C. D. Adams. Both differ from the latter in being 

 uniformly larger and also in details of sculpture. 



Named for Mr. Arthur Haycock. 



CERITHIOPSIS MOVILLA, new species. 

 Plate 35, fig. 11. 



Shell elongate-conic, brown, the tubercles a little lighter than the 

 ground color. Nuclear whorls two, well rounded, smooth. Post- 

 nuclear whorls well rounded, marked with three spiral cords, of 

 which the first is at the summit, the third somewhat above the suture, 

 while the second is half way between the two. The spaces between 

 these spiral cords are a little wider than the cords. In addition to 

 the spiral cords, the whorls are marked by somewhat retractive, well 

 rounded, axial ribs, which are a little less strong than the spiral cords. 

 Of these ribs, 14 occur upon the first, 16 upon the second and third, 

 18 upon the fourth, 20 upon the fifth, 22 upon the sixth, and 24 upon 

 the penultimate turn. The junctions of the axial ribs and spiral 

 cords form well developed small tubercles, of which those on the 

 first spiral cord are well rounded, those on the median are slightly 



