% 



NO. 2193. WEST AMERICAN MARINE MOLLUSKS—BARTSCH. 641 



seventh, and 18 upon the penultimate turn. These ribs become 

 somewhat enfeebled and slightly expanded toward the summit. 

 Intercostal spaces about 3^ times as wide as the ribs marked by a 

 ciouble series of incised pits, of which one is midway between the 

 summit and the periphery while the other is at the periphery. The 

 space between the summit and the median pit is marked by 13 slender 

 incised striations of varying strength, while that between the median 

 and peripheral pit is crossed by 9 incised lines. Suture moderately 

 constricted. Periphery of the last whorl angulated, marking the 

 termination of the axial ribs and intercostal spaces. Base very short, 

 well rounded, marked by 14 subequal and subequally spaced feebly 

 incised wavy spiral striations and slender incremental lines. 

 Aperture very short, decidedlj^ subquadrate, the angles at the junc- 

 tion of the outer and basal lip and the basal and inner lips being 

 almost right angles; posterior angle obtuse; outer lip thin, showing 

 the external sculpture within; inner lip very slightly oblique, and 

 slightly revolute; parietal wall glazed by a thin callus. 



The "'type, Cat. No. 268232 U.S.N.M., was dredged by the U. S. 

 Bureau of Fisheries steamer Albatross at station 5678, off Redondo 

 Point, Magdalena Bay, Lower California, in 13^ fathoms, on broken 

 shell bottom. It has 9 postnuclear whorls and measures — length, 

 4.7 mm. ; diameter, 1.5 mm. 



TURBONILLA (STRIOTURBONILLA) BARKLEYENSIS, new species. 



Plate 42, fig. 8 ; plate 44, fig. 9. 



Shell large, slender, elongate conic, bluish white. Nuclear whorls 

 small, a little more than two and a quarter, depressed helicoid, hav- 

 ing their axis at right angles to that of the succeeding turn, in the 

 first of which they are slightly immersed. Postnuclear whorls well 

 rounded, appressed at the summit, marked by slender, curved, mod- 

 erately regular, slightly protractive, axial ribs, of which 16 occur upon 

 the first to fifth, 18 upon the sixth, 22 upon the seventh and eighth, 

 24 upon the ninth and tenth, and 26 upon the penultimate turn. In- 

 tercostal spaces moderately impressed, terminating a little posterior to 

 the periphery of the whorls. The summit of the succeeding turns falls 

 a little anterior to the termination of the intercostal pits and leaves 

 a smooth band in the suture. Suture moderately constricted. Pe- 

 riphery of the last whorl obtusely angulated. Base moderately long, 

 weakly rounded. The entire surface of the shell is marked by 

 microscopic striations. Aperture large, broad, subquadrate, some- 

 what effuse at the junction- of the basal and the outer lip, posterior 

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

 within; inner lip decidedly oblique, slightly curved and somewhat 

 revolute ; parietal wall covered by a thin callus. 

 65008°— Proc.N.M. vol.52— 17 41 



