NO. 1574. WEST AMERICAN PYRAMIDELLID^- BALL AND BARTSCH. 497 



TURBONILLA (STRIOTURBONILLA) STYLINA Carpenter. 

 Plate XLIV, figs. 11, 11a. 



Chemnitzia {ftorquata var. ) stylina Carpenter, Ann. Mag. Nat. Hist, 3rd ser., 



XV, 1865, p. 396. 

 TurboniUa {SirioturhoniUa) torquatn styllna Ba^ll and Bartsch, Mem. C^ala. Acad., 



Ill, 1903, p. 272, in part. 



Shell ylender, subdiaphanous to milk-white. Nuclear whorls two, 

 smooth, depressed, helicoid, scarcely extending bej'ond the outline of 

 the spire and having their axis at right angles to the axis of the 

 succeeding turns. Post-nuclear whorls well rounded, separated by 

 strongly constricted sutures, rather high, ornamented b}^ rather low, 

 broad, rounded, sinuous, oblique axial ribs, of which there are 16 

 upon the first, 20 upon the fifth, and 28 upon the penultimate turn. 

 Intercostal spaces moderately depressed, about as wide as the ribs, 

 terminating a short distance above the sutures, thus leaving a narrow 

 smooth band between the termination of the ribs and the suture as in 

 T {Strioturhonill(() tonjuata Gould, but not quite as wide as in that 

 species. Periphery of the last whorl well rounded. Base rather 

 short, well rounded. Entire surface marked by very fine wavy spiral 

 striations. Aperture subovate, outer lip thin, columella slender, 

 moderately long, slightlv twisted, almost vertical. The specimen 

 described and figured (Cat. No. 56429, U.S.N.M.) was collected by 

 Doctor Dall in 8 or 10 fathoms at Monterey, California. It has 11 

 post-nuclear whorls and measures: Length 6.5 mm., diameter 1.7 mm. 

 (not 8 and 1.9 mm., as erroneously stated in the last-cited reference). 

 Another specimen was dredged in 12 fathoms ofi:' Del Monte, Monterey, 

 by Mr. S. S. Berry (Cat. No. 165199, U.S.N.M.). Two specimens 

 (Cat. No. 163249, U.S.N.M.), both immature, dredged by the Bureau 

 of Fisheries steamer Alhatrotis at station 2932 in 50 fathoms off Coro- 

 nado Island, are provisionally referred to this form. 



TURBONILLA (STRIOTURBONILLA) SERR^E, new species. 



Plate XLIV, figs. 8, 8rr. 



Shell slender, very elongate-conic, subdiaphanous to milk-white. 

 Nuclear whorls decollated. Post-nuclear whorls very high between 

 the sutures, moderatel}^ rounded, slightly contracted at the periphery 

 and somewhat shouldered at the summit, rendering the sutures sub- 

 channelled. The whorls are marked by subequal and subequally 

 spaced, rather broad, rounded, almost vertical axial ribs, which are a 

 little wider than the intercostal spaces; the depressed portion of the 

 latter terminating a little above the suture. In the type, which has 

 lost the nucleus and probablj^ the first two post-nuclear turns, there are 

 16 ribs on the third of the remaining whorls, 20 on the eighth, 22 upon 



Proc. N. M. vol. xxxiii— 07 32 



