128 BULLETIN 68, UNITED STATES NATIONAL MUSEUM. 



turns. Intercostal spaces about eight times as wide as the axial ribs, 

 crossed by fine spiral striations, of v/hich about fourteen occur 

 between the sutures. Base slightly excavated. Aperture oval ; colu- 

 mella decidedly curved. 



The type has five post-nuclear whorls and measures: Length 2.5 

 mm., diameter 0.6 mm. 



The species described in Les Meleagrinicoles were taken from pearl 

 oj^sters which are said to have come from Negritos and the Margarita 

 Island in the Bay of Panama. No specific station is cited for this 

 species. It has been referred to Panama by Tryon in his Manual of 

 Conchology. 



TURBONILLA (PYRGISCXJLUS) EUCOSMIA, new species. 

 Plate 12, figs. 13, 13a. 



Shell pupoid, light yellow, with a narrow, darker band at the 

 shoulder. Nuclear whorls one and three-fourths, forming a depressed, 

 helicoid spire, the axis of which is at right angles to that of the suc- 

 ceeding turns, in the first of which it is about one-fourth immersed. 

 Post-nuclear whorls slightly flattened in the middle, with a strong 

 sloping shoulder which extends over the posterior fourth between the 

 sutures and renders them decidedlj^ angulated at its anterior termi- 

 nation; slightly contracted at the suture, marked by strong, sub- 

 lamellar, axial ribs, which are vertical on the first four whorls and 

 decidedly retractive on the later ones. Of these ribs, 16 occur upon 

 the first five whorls, 18 upon the sixth, and 20 upon the penultimate 

 turn. Intercostal spaces about two and one-half times as \\ade as 

 the ribs, marked by a double series of very broad pits, one of which 

 is at the periphery and the other immediately anterior to the shoul- 

 der. The space between these pits is divided into four equal cords 

 by three moderately wide pits, the cords in turn being divided by a 

 fine incised line. The shoulders are marked by five equal and equally 

 spaced, incised, spiral lines. Sutures strongly impressed. Base mod- 

 erately long, well rounded, marked by eight almost equal and equally 

 spaced spiral striations. Aperture oval; posterior angle acute; outer 

 lip thin, showing the external sculpture within; columella slender, 

 sinuous, and strongly reflected; parietal wall covered with a strong 

 callus. 



The type (Cat. no. 162698, U.S.N.M.) was dredged at U. S. Bureau 

 of Fisheries station 2822, in 21 fathoms, off La Paz, Lower California. 

 It has eight post-nuclear whorls and measures: Length 4.8 mm., 

 diameter 1.4 mm. Two additional specimens (Cat. no. 1632510, 

 U.S.N.M.) were dredged at U. S. Bureau of Fisheries station 2827, in 

 10 fathoms, off Ceralvo Island, Gulf of Cahfornia. 



