ARNOLB — THE PALEONTOLOGY AND STEATIGEAPHY OF SAN PEDRO. 233 



Ventura. The specimens of this species found at Crawfish George's are character- 

 ized by their large size and elevated spire, with deeply impressed suture. 



Living. — Straits of Fuca to San Diego (Cooper). 



Pleistocene. — Santa Barbara to San Diego (Cooper): San Pedro; Ventura; 

 San Diego (Arnold). 



Pliocene. — Danger Creek; Santa Rosa; Soquel, Santa Cruz County; San Diego 

 well (Cooper): San Pedro (Arnold). 



Miocene. — Martinez; Walnut Creek; Griswold's, San Benito County; Foxin's, 

 Santa Barbara County (Cooper). 



221. Nassa insculpta Carpenter. 



Nassa insculpta Cpr., Brit. Assn. Rept., 1863, p. 662; Proc. Cal. Acad. Sci., Vol. Ill, 1866, p. 223. 

 Tryon, Man. Conch., Vol. IV, p. 38, PI. XII, fig. 154, 1882; (not of Cooper, ytli Ann. 

 Rept. Cal. St. Min., 1S88, p. 253). Williamson, Proc. U. S. Nat. Mus., Vol. XV, 

 1892, p. 2X2, PI. XXIII, fig. 6. 



Shell small, conical; spire elevated; apex subacute; whorls seven, nearly flat, but obliquely 

 truncated near margin; sculpture consists of numerous fine, spiral furrows, which are most promi- 

 nent on lower portion of body-whorl; four upper whorls have prominent transverse ridges; aperture 

 subquadrate; outer lip thickened by a slightly denticulated ridge; inner lip incrusted slightly, but 

 spiral ornamentation shows through the incrustation; columella short and separated from body-whorl 

 by deep, narrow groove; canal short, broad, curved. 



Dimensions. — Long. 20 mm.; lat. 11 mm.; body-whorl 12.8 mm.; aperture, including canal, 

 9 mm.; defl. 38 degrees. 



Distinguishable by lack of any but spiral ornamentation on lower whorls. A 

 specimen in the State Museum collection at Berkeley labeled N . insculpta is not the 

 species, but is close to JSf. versicolor var. hooveri. This is probably the specimen upon 

 which Cooper bases his report of the occurrence of A^. insculpta at Santa Barbara. 

 Bare in upj)er San Pedro series of San Pedro; one specimen. 



Living. — Catalina Island (Cooper; Raymond). 



Pleistocene. — San Pedro (Williamson; Arnold). 



222. Nassa mendica Gould. 



Nassa mendica Gld., Proc. Bost. Soc. Nat. Hist., 1850, p. 155. Wilkes' E.xpl. Exped., Vol. XII, 

 p. 263, PI. XIX, fig. 331, 1852. Otia, Conch., p. 70, 1862. Cpr., Brit. Assn. Rept., 

 1863, p. 662; ^=M. woodwardi Fbs.; =A^. gibbsii Cooper {Jide Tryon, Man. Conch., 

 Vol. IV, p. 56, PI. XVII, figs. 320-323, 1882). Gabb, Pal. Cal., Vol. II, p. 74, 1869. 

 Cooper, 7th Ann. Rept. Cal. St. Min., 1888, p. 253. Keep, West Coast Shells, p. 37, 

 1892. Williamson, Proc. U. S. Nat. Mus., Vol. XV, 1892, p. 213. 



Shell small, conical; spire elevated; apex acute; whorls seven, convex; ornamented with a 

 varying number of transverse ridges and a few less prominent spiral ridges; suture deeply impressed, 

 distinct; aperture subquadrate; outer lip thin, smooth on edge, but denticulated remote from margin; 

 inner lip incrusted; columella curved, spirally striated, and separated from body-whorl by deep 

 groove; canal short, recurved. 



Dimensions. — Long. 18.5 mm.; lat. 8 mm.; body- whorl 11 mm.; aperture, including canal, 

 7.5 mm.; defl. 38 degrees. 



( 30 ) March 20, 1903. 



