280 CALIFORNIA ACADEMY OF SCIENCES. 



This is certainly the most unattractive member of the genus. Dr. Carpenter 

 described it as a recent form in his Catalogue of Mazatlan Shells. We have a single 

 recent specimen from Monterey. It appears to be more abundant in the post- 

 Pliocene dejiosits of Deadman Island. 



300. Turbonilla (Pyrgolampros) adleri D. £ B., sp. nov. 



Plate I, Fig. 9. 



Whorls decidedly flattened, contracted at the periphery and shouldered at the summit; 

 a.\ial ribs only faintly indicated near the summit of the whorls by distant, shallow, impressed lines, 

 which mark their lateral margins; the entire shell is traversed by faint, closely placed, wavy, spiral 

 striations; suture quite deep, subchanneled; periphery of the last whorl rounded; aperture sub- 

 rhomboidal, posterior angle obtuse; columella reflexed, strongly twisted, giving it the appearance of 

 being provided with a broad, rounded fold; a faint callus connects the columella with the posterior 

 angle of the aperture. 



Dimensions. — Long. 9.3 mm.; diam. 3.2 mm. 



Only two fragments of this specimen have so far come to our notice; both are 

 from the post-Pliocene deposits of Deadman Island. 



The type consists of the last six post-nuclear whorls. It may, however, have 

 had eleven whorls normally. 



Genus Pyramidella Lamarck. 



Shell turriculated, spire elevated, a-xially ribbed; columella with three anterior plications; 

 outer lip sharp, sometimes plicate within. 



Pyramidella plicata Lamarck is a characteristic species. 



301-. Pyramidella conica Adams, var. variegata Carpenter. 



Obeliscus variegata Cpr., Brit. Assn. Rept. , 1863, p. 65S; Ann. Mag. Nat. Hist., 3rd Ser., Vol. XIV, 



1864, p. 46. Keep, West Coast Shells, p. 54, fig. 35, 1892. 

 Pyramidella conica Ads., var. variegata Cpr., Williamson, Proc. U. S. Nat. Mus., Vol. XV, 



1892, p. 208. 



Shell small, elongate-conical; spire elevated; apex acute; whorls ten, flat, smooth; suture 

 distinct; aperture subovate; outer lip thin; columella truncated, with three plications. 

 Dimensions. — Long. 13 mm.; lat. 3.6 mm.; defl. 20 degrees. 



Rare in upper San Pedro series of San Pedro; one specimen. This species 

 was omitted from the text prepared by Dall and Bartsch. In examining some 

 Turhonillas in the collection of Mr. Henry Hemphill the writer found one of this 

 sjiecies labeled "Turbonilla mexicana Dall and Bartsch." This name is the one 

 under which it probably should appear, but not having an opportunity to consult 

 Dr. Dall on the subject, this note is appended. 



Living. — San Diego; Lower California (Carpenter). 



Pleistocene. — San Pedro (Arnold). 



