AKNOLD— THK rAI.EOXTOLdC.Y AND STKATinKATHY OF SAX PEDIU). 303 



Distinguishable by its compactness, angiilated Ixxly-wiioil, small ciiink and 

 angle of doHection. TIil' spiH'inuMi described was identilied l)y Dr. Dall as probably 

 being of this species. 



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

 are labeled L. soliduln. 



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



Living. — Vancouver district (Carpenter). 



Pleistocene. — San Pedro; Ventura; Sa,uta Barbara; San Diego (Arnold). 



335. Lacuna porrecta Carpenter. 



Lacuna porrecta Cpr., Brit. Assn. Rejjt., 1863, p. 656; Ann. & Mag. Nat. Hist., 3ici Ser., Vol. XIV, 

 1864,9.429. 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, conve.x; body-whorl very slighUy 

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



Dimensions. — Long. 6 mm.; lat. 5 mm.; body-whorl 5.7 mm.; aperture 4.3 mm.; defi. 

 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 Lsland; 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 VUI, Fio. 11. 



Lacuna soiidti/a Loves, Index Moll. Scandin., p. 23 (/es/e 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, Parts, 1892, 

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



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



Liltorina pedroana Con., Pac. R. R. Rept., Vol. V, p. 327, PI. VI, fig. 50, 1856. 



Modelia striata Gabb, 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, efTuse, incrusted; small umbilical chink. 



Ditnetuions. — Long. 10 mm.; lat. 6.2 mm.; body-whorl 7.5 mm.; aperture 5.5 mm. ; defi. 

 44 degrees. 



