280 CALIFORNIA ACADEMY OF S(IENCI':S. 



'rilis is certiiiiily tlic most iitiiiltracLivc member of the fijeniis. Dr. Ciirpciiter 

 tiosi'iibeil it as a reeeiit form in his Catalo^^ue of Mazathin Shells. AVe have a siiit^ie 

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

 Pliocene deposits of Deadman Island. 



300. Turbonilla (Pyrgolampros) adleri I). .( />*., sp. nov. 



Plate I, Fu;. i). 



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

 axi.il ribs only faintly indicated near the summit of the whorls by distant, shallo'v, impressed lines, 

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

 striations; suture cjuite deep, subchannelcd; jicriphcry of the last whorl rounded; aperture sub- 

 rhomboidal, posterior angle obtuse; columella rL-tlexcd, 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 siiarp, sometimes plicate within. 



Pyramidella plicata Lamarck is a characteristic species. 



301. Pyramidella conica Adams, var. variegata Carpenter. 



Obeliscus variegata Cpr., Hrit. Assn. Rept., 1863, p. 658; Ann. Mag. Nat. Hist., 3rd Sen, \'c)l. XiV, 



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

 Pyramidella conica Ans., var. variegata Cpr., Williamson, Proc. U. S. Nat. Mus., \oI. 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 Dal! and Bartscii. In examining some 

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

 species labeled "7'iirbnnilla me.ncnna 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). 



