76 BULLETIN 91, UNITED STATES NATIONAL MUSEUM. 



posterior to the suture, which is equal in strength to the spiral cord at 

 the periphery. The sulcus between the two spiral cords and between 

 the anterior cord and the periphery of the last whorl are marked by 

 the continuations of the axial ribs. Sutures strongly channeled. 

 Periphery of the last whorl rendered decidedly angulated by the 

 spiral cord. Base rather long, well rounded, narrowly umbilicated. 

 The entire surface is marked by slender spiral striations. Aperture 

 broadly oval; outer lip moderately thick; inner lip somewhat curved 

 and slightly revolute ; columella provided with an oblique fold at its 

 insertion; parietal wall glazed with a thick callus. 



The type, Cat. No. 250374, U.S.N.M., comes from Port Alfred 

 (Coll. No. 1247). It has eight postnuclear whorls, and measures: 

 Length, 5 mm.; diameter, 1.8 mm. Cat. No. 250361, U.S.N.M., con- 

 tains the nucleus of a young specimen from the same place (Coll. No. 

 1234). 



TURBONILLA (STRIOTURBONILLA) SECURA, new name. 



Plate 17, fig. 7. 



Turbonilla dbeliseus Gould, Proc. Bost. Soc. Nat, Hist,, vol. 7, p. 406, 1861. Not 

 Chemnitzia obcliscus C. B. Adams, Contr. Conch., pp. 72-73, 1850. (Also a 

 StrioturboniUa). 



Shell quite large, broadly conic, bluish-white. Nuclear whorls one 

 and three-fourths, rather large, forming a well-rounded, depressed, 

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

 ceeding turns. Postnuclear whorls moderately rounded, narrowly 

 shouldered at the summit, marked by rather strong, low, rounded, 

 decidedly pro tractive, axial ribs, of which 16 occur upon the first to 

 third, 18 upon the fourth to sixth, 20 upon the seventh, 24 upon the 

 eighth and ninth, 26 upon the tenth and penultimate whorl. The 

 spaces between the axial ribs are narrower than the ribs, and not 

 very strongly impressed. Suture slightly channeled. Periphery of 

 the last whorl well rounded ; base short, well rounded. Entire surface 

 of base and spire marked by rather strong incremental lines and very 

 fine, closely spaced, wavy, spiral striations. Aperture subquadrate, 

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

 within; inner lip decidedly oblique and slightly revolute; parietal 

 wall glazed with a thin callus. 



Cat. No. 165, U.S.N.M., contains Gould's type, collected by William 

 Stimpson on the North Pacific Exploring Expedition, at Simons Bay, 

 Cape of Good Hope. It has 12 postnuclear whorls and measures: 

 Length, 11.1 mm.; diameter, 3 mm. Cat. No. 186843, U.S.N.M., 

 three specimens from Port Alfred (Coll. No. 210). 



TURBONILLA (STRIOTURBONILLA) LAEVOCOSTATA Sowerby. 



Cat. No. 186845, U.S.N.M., contains sLx specimens of this species 

 from Port Alfred (Coll. No. 212). 



