78 BULLETIN 91, UNITED STATES NATIONAL MUSEUM. 



The type and another specimen, Cat. No. 227732, U.S.N .M., come 

 from Port Alfred (Coll. No. 827). The type nas seven postnuclear 

 whorls, and measures: Length, 3.9 mm.; diameter, 1.1 mm. 



TURBONILLA (PYRGISCUS) ATOSSA, new species. 



Plate 15, fig. 1. 



Shell elongate-conic, bluish-white. Nuclear whorls more than two, 

 smooth, the early portion obliquely immersed in the later. Post- 

 nuclear whorls strongly shouldered at the summit, marked by well- 

 rounded, somewhat retractive, strong, axial ribs, of which 16 occur 

 upon the first, 18 upon the second to fourth, and 20 upon the pe- 

 nultimate turn. These ribs extend strongly from the summit of the 

 whorls to the umbilical chink. Intercostal spaces about twice as 

 broad as the ribs, crossed by fine, incised, spiral fines, of which 7 occur 

 between the shoulder at the summit and the suture on the first and 

 second, 9 upon the third, 15 upon the fourth and the penultimate 

 turn. The spaces separating these spiral striations are about twice 

 as wide as the striations. Sutures strongly constricted. Periphery 

 of the last whorl somewhat inflated, well rounded. Base moderately 

 long, well rounded, narrowly umbilicated, marked by the strong 

 continuations of the axial ribs and fine spiral striations, which become 

 a little closer spaced on the anterior portion than at the periphery. 

 Aperture pear-shaped; posterior angle obtuse; outer lip somewhat 

 sinuous, thick within, sloping to a thin edge; columella slender, curved, 

 reflected, provided with an oblique fold at its insertion; parietal wall 

 covered with a thick callus which gives the peristome a complete 

 aspect. 



The type, Cat, No. 249700, U.S.N.M., comes from Port Alfred (Coll. 

 No. 972). It has six postnuclear whorls and measures: Length, 4.4 

 mm.; diameter, 1.7 mm. Cat. No. 249695, U.S.N.M., contains a 

 young specimen from the same locality (Coll. No. 967). 



TURBONILLA (PYRGISCUS), species? 



Cat. No. 186851, U.S.N.M., contains a specimen from Port Alfred 

 (Coll. No. 218), which has very strong protractive axial ribs, numer- 

 ous, finely incised, spiral striations in the intercostal spaces, and a 

 very pronounced plait on the pillar. I refrain from giving it a name 

 until more complete material may be at hand. 



TURBONILLA (PYRGISCUS), species ? 



Cat. No. 186851a, U.S.N.M., contains a badly-worn specimen from 

 Port Alfred (Coll. No. 218a). It is much smaller than the last one 

 referred to, and is probably a new species. 



