82 BULLETIN 91, UNITED STATES NATIONAL MUSEUM. 



The type and another specimen, Cat. No. 249706, U.S.N .M., come 

 from Port Alfred (Coll. No. 78). The type has eight postnuclear 

 whorls, and measures: Length, 4.9 mm.; diameter 1.5 mm. 



TURBONILLA (PYRGISCUS), species? 



Cat. No. 249694, U.S.N.M., contains two worn specimens from Port 

 Alfred, too poor to determine (Coll. No. 966). 



TURBONILLA (DUNKERIA) TEGULATA Sowerby. 



Cat. No. 186846, U.S.N.M., contains three specimens of this species 

 from Port Alfred (Coll. No. 213). 



TURBONILLA (CINGULINA) TRACHEALIS Gould. 



Plate 17, fig. 1. 



Chemnitzia (Polyspirella) trachealis Gould, Proc. Bost. Soc. Nat. Hist., vol. 7, 

 p. 407, 1861. 



Shell elongate-conic, yellowish-white. Nuclear whorls large, pla- 

 norboid, well rounded, smooth, obliquely immersed in the first of the 

 succeeding turns, above which only the tilted edge of the last two volu- 

 tions projects. Postnuclear whorls moderately rounded, shouldered at 

 the summit, marked by three strong spiral cords which slope abruptly 

 posteriorly and gently anteriorly. These cords are about twice as 

 wide as the spaces that separate them. Beginning with the third to 

 last turn, the suture falls gradually more and more anterior to the 

 peripher}', exposing a portion of the base, which appears as a flattened 

 band above the suture. In addition to the spiral cords, the whorls 

 are marked by numerous, slender, raised, axial threads in the depressed 

 spaces between the cords. These threads are about one-fourth as 

 wide as the spaces that separate them. Suture scarcely differentiated 

 from the other grooves. Periphery of the last whorl well rounded. 

 Base rather short, well rounded, marked by incremental lines and 

 exceedingly fine, spiral striations. Aperture broadly ovate; posterior 

 angle acute; outer lip thin, showing the external sculpture within; 

 columella somewhat twisted, provided with an obsolete fold at its 

 insertion. 



Gould's type, Cat. No. 165a,U.S.N.M., which was collected by Wil- 

 liam Stimpson on the North Pacific exploring expedition at Simon's 

 Bay, Cape of Good Hope, has 9 postnuclear whorls and measures: 

 Length, 5.7 mm.; diameter, 2 mm. A specimen having 12 whorls but 

 minus the nucleus measures: Length, 12.2 mm.; diameter, 2.5 mm. 

 Four additional lots of this species are in the collection of the United 

 States National Museum from South Africa as follows: Cat. No. 

 250398a, four specimens (Coll. No. 1271a). Cat. No. 250399, three 

 specimens (Coll. No. 1272). Cat. No. 187048, one specimen (Coll. 

 No. 586). Cat. No. 187047, three specimens (Coll. No. 585). 



