ARNOLD — THE PALEONTOLOGY AND STEATIGEAPHY OF SAN PEDRO. 303 



Distinguishable by its compactness, angulated body-whorl, small chink and 

 angle of deflection. The specimen described was identified by Dr. Dall as probably 

 being of this species. 



Some specimens of L. compacta in the State Museum collection at Berkeley 

 are labeled L. solidula. 



Rare in lower San Pedro series at Deadman Island; and in the upper San 

 Pedro series at Los Cerritos and San Pedro. Found in the Pleistocene at Barlow's 

 ranch, Ventura; at bath-house, Santa Barbara; and at Spanish Bight, San Diego. 



Living. — Vancouver district (Carpenter). 



Pleistocene. — San Pedro; Ventura; Santa Barbara; San Diego (Arnold). 



335. Lacuna porrecta Carpenter. 



Lacuna porrecta CpR., Brit. Assn. Rept, 1863, p. 656; Ann. & Mag. Nat. Hi.st., 3rd Sen, Vol. XIV, 

 1864, p. 429. Tryon, Man. Conch., Vol. IX, p. 265, PI. L, figs. 55, 56, 57, 1887. 

 Keep, West Coast Shells, p. 66, 1892. 



Shell small, white; spire not much elevated; whorls three, convex; body-whorl very slightly 

 angulated; suture distinct; aperture ovate; lip effuse; umbilical chink large. 



DimeJisions . — Long. 6 mm.; lat. 5 mm.; body-whorl 5.7 mm.; aperture 4.5 mm.; defl. 

 74 degrees. 



Distinguishable by large umbilical chink, depressed spire, large angle at apex, 

 and effuse outer lip. 



Three specimens of this species found in the lower San Pedro series at Dead- 

 man Island; also found in same horizon at San Pedro; and in the upper San Pedro 

 series at Deadman Island, San Pedro, Los Cerritos, and Crawfish George's. 



Living. — Vancouver district (Carpenter). 



Pleistocene. — San Pedro (Arnold). 



336. Lacuna solidula (Loven) Carpenter. 

 Plate VIII, Fig. 11. 



Lacjina solidula Loven, Index Moll. Scandin., p. 23 {teste Cpr., Brit. Assn. Rept., 1863, p. 656). 

 Gabb, Pal. Cal, Vol. II, p. 80, 1869. Tryon, Man. Conch., Vol. IX, p. 266, PI. L, 

 fig. 69, 1887. Cooper, 7th Ann. Rept. Cal. St. Min., 1888, p. 244. Keep, West 

 Coast Shells, p. 66, 1892. Dall, Trans. Wagner Inst. Sci., Vol. Ill, Part 2, 1892, 

 p. 321. Williamson, Proc. U. S. Nat. Mus., Vol. XV, 1892, p. 205. 



Lacuna carmata Gld., Proc. Bost. Soc. Nat. Hist., 1848, p. 75. 



Liitorina pedroana Con., Pac. R. R. Rept, Vol. V, p. 327, PI. VI, fig. 50, 1S56. 



Modelia striata Gab^, Proc. Phil. Acad. Nat. Sci., 1861, p. 368. 



Shell small, turreted, thin; spire elevated, subacute; whorls four, rounded, ornamented with 

 fine oblique incremental lines; suture deeply impressed, distinct; aperture large, ovate; outer lip 

 thin; inner lip sharp, effuse, incrusted; small umbilical chink. 



Dimensions. — Long. 10 mm.; lat. 6.2 mm.; body-whorl 7.5 mm.; aperture 5.5 mm. ; defl. 

 44 degrees. 



