196 ALLAN HANCOCK PACIFIC EXPEDITIONS VOL.2 



lines of growth and very fine spiral striations; base inflated, strongly 

 rounded, with a narrow, open umbilicus bounded by a strong, axially 

 striated cord ; aperture oval, with a slight anterior canal ; outer lip thin, 

 showing 3 faint white spiral lines deep within the aperture; columella 

 slender, with the continuation of the basal cord forming a strong 

 lamellar fold at its insertion, below which are 2 much weaker and more 

 oblique folds. The type measures: length, 8.8 mm; diameter, 2.8 mm. 



Holotype: No. 739 (Calif. Acad. Sci. Paleo. Type Coll.), from Loc. 

 27,228 (C.A.S.), dredged in from 3 to 9 fms. off Taboga Island, 

 Panama. L. G. Hertlein collector. Eight additional specimens were 

 dredged at the same locality. 



In general shape this species resembles Pyramidella conica C. B. 

 Adams,^^ but the presence of the open umbilicus is a marked difference. 

 The only other umbilicated species described from the west coast, Pyra- 

 midella bairdi Dall & Bartsch^^ from the Gulf of California, is an 

 entirely differently shaped shell. 



This species is named for Captain Allan Hancock, owner of the 

 motor cruiser Velero III, through whose generosity the junior author 

 was afforded the opportunity to accompany the expedition and make the 

 collection upon which this report is based. 



Turbonilla (Strioturbonilla) cowlesi Strong & Hertlein, 



new species 

 Plate 19, Fig. 3 



Shell elongate-conic, white; nuclear whorls 2^^, forming an elevated 

 helicoid spire, the axis being at right angles to that of the first post- 

 nuclear whorl, in which it is slightly immersed, with the apex pro- 

 jecting beyond the outline of the following whorls; postnuclear whorls 

 10, well rounded, narrowly shouldered, sutures impressed; axial sculp- 

 ture of slender, nearly vertical ribs, of which 20 appear on the first 

 postnuclear whorl and 16 on the remaining whorls; intercostal spaces 

 shallow, about three times as wide as the ribs, extending from suture 

 to suture but terminating at the periphery; spiral sculpture of very fine, 

 microscopic striations over the entire surface; periphery of the last 



25 Pyramidella conica C. B. Adams, Ann. Lvceum Nat. Hist. New York, 

 vol. 5, 1852, pp. 424, 542. "Panama."— Dall & Bartsch, U. S. Nat. Mus., Bull. 

 68, 1909, p. 23, pi. 1, fig. 9. "Panama Bay." 



26 Pyramidella (Pyramidella) bairdi Dall & Bartsch, U. S. Nat. Mus., Bull. 

 68, 1909, p. 19, pi. 1, figs. 5, 5a. "Gulf of California." 



