NO. 12 STRONG AND HERTLEIN : MARINE MOLLUSKS 199 



Turbonilla (Pyrgiscus) garthi Strong & Hertlein, new species 



Plate 19, Fig. 9 



Shell elongate-conic, white; nuclear whorls 2^, forming a de- 

 pressed, helicoid spire, with the axis at right angles to that of the fol- 

 lowing whorls, in the first of which they are about one third immersed ; 

 postnuclear whorls 10, high between the sutures, with the sides flat- 

 tened; axial sculpture of low, almost vertical ribs, of which 18 appear 

 on the early whorls and 20 on the last whorl; interspaces shallow, 

 nearly twice as wide as the ribs, marked with about 12, indistinct, ir- 

 regularly spaced, spiral series of pits; peripheiy of last whorl rounded, 

 marked by a stronger spiral series of pits, below which the ribs fade 

 out; base moderately long, marked with fine, incised spiral lines; aper- 

 ture subquadrate, outer lip thin, showing the external sculpture within; 

 columella nearly straight. The type measures: length, 5.5 mm; diameter, 

 1.4 mm. 



Holotype: No. 754 (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. A second specimen was dredged at 

 the same locality and two young specimens at Loc. 27,229 (C.A.S.), 

 in Bahia Honda, Panama. 



In the key given by Dall & Bartsch to the west coast species in the 

 subgenus Pyrgiscus, ^'^ the new species garthi would follow macbridei 

 from which it is easily distinguished by its less slender form and fewer 

 axial ribs. 



This species is named for Mr. John S. Garth, who accompanied the 

 expedition, as collector of Lepidoptera and as musician. 



Turbonilla (Pyrgiscus) stonei Strong & Hertlein, new species 



Plate 19, Fig. 5 



Shell minute, slender, pale brown; nuclear whorls 2^, compara- 

 tively large, helicoid, moderately elevated, with the axis at right angles 

 to that of the following whorls, in the first of which it is about one 

 third immersed; postnuclear whorls 7, moderately rounded, sutures im- 

 pressed ; axial sculpture of narrow, sinuous, nearly vertical ribs of which 

 18 appear on the second whorl, gradually increasing to 26 on the last 

 whorl, while on the first whorl they are more numerous and quite 



30 Dall, W. H., and Bartsch, P., U. S. Nat. Mus., Bull. 68, 1909, pp. 74, 75, 

 76. 



