% 



NO. 2193. WEST AMERICAN MARINE M0LLUSKS—BART8CH. 655 



The type, Cat. No. 267722^, U.S.N.M., was dredged in shallow 

 water in Santa Maria Bay, Lower California. It has lost the nucleus 

 and probably the first two postnuclear turns; the nine and a half 

 remaining whorls measure — length, 5.9 mm. ; diameter, 1 mm. 



TURBONILLA (PYRGISCUS) LAZAROENSIS, new species. 

 Plate 45, fig. 11. 



Shell extremely slender, elongate conic, milk-white. Nuclear 

 whorls decollated, Postnuclear whorls flattened, very high between 

 the sutures, slightly excurved immediately below the feebly shoul- 

 dered summit, and marked by very regular and regularly spaced 

 well rounded, slightly protractive axial ribs of which 20 occur upon 

 all the remaining turns excepting the last two. Of these the penulti- 

 mate has 24 and the last 32. Intercostal spaces a little narrower than 

 the ribs, marked by 17 spiral series of pits of which the first 16 are 

 subequal and subequally spaced. The last, the peripheral pit is a 

 little wider than the rest and separated from the sixteenth by a space 

 about five times as wide as those separating the other pits. The first 

 pit is about as far anterior to the summit as the sixteenth is distant 

 from the seventeenth. Suture slightly contracted. Periphery of the 

 last whorl well rounded. Base attenuated marked by the very feeble 

 continuation of the axial ribs and eight wavy incised spiral lines 

 which are of about the same strength but not of equal spacing. A 

 broad band separates the peripheral line of pits from the first basal 

 line; the next three lines are closely and equally spaced, while the 

 fourth is a little farther from the third than that is from the second 

 and the distance between the fourth and fifth is in equal proportions 

 greater than that between the third and fourth. The rest are again 

 narrowly and about equally spaced. Aperture elongate oval; pos- 

 terior angle acute; outer lip thin showing the external sculpture 

 within by transmitted light: inner lip slightly curved reflected and 

 appressed to the attenuated base for almost its entire length, pro- 

 vided with a very oblique, strong fold at its insertion ; parietal wall 

 glazed by a thin callus. 



The type. Cat. No. 267742 U.S.N.M., was dredged in shallow 

 water off Lazaro Point, Santa Maria Bay, Lower California. It has 

 lost the nucleus and probably the first 3 postnuclear turns, the 9^ 

 remaining measure — length, 5.8 mm. ; diameter, 0.85 mm. 



This species is nearest related to Turhonilla {Pyrgiscus) mariana 

 Bartsch from which it differs by its much more slender forai and 

 spiral sculpture. 



