l.'O CAI.iroUNlA ACADKMV OV SCIKNCICS. 



87. Tapes laciniata dtrpenter. 



Pi.ATK XIV, Vu:. .1. 



7'iif>£s /aciniala Ci'k., Hrit. Assn. Rept., 1S63, p. 641; Jour. <le Conch., \'<il. XII, iS6s, p. 136 

 Keep, West Coast Shells, p. 186, 1892. Williamson, Proc. U. S. Nat. Mus., Vol. 

 XV, 1892. p. 188. 



Shell large, oval, swollen, thick, bill hriulc; surtacc net-like, c.iuscd i)y iironiincnt, tliick 

 roiindetl, concentric frills, and numerous rounded, radiating ridges; m.irgin smooth; hinge and 

 interior parts as in T. staniinea. 



Piiufiisions. — Long. So mm.; alt. 6S mm.; diam. 56 mm. 



Re.seml)les T. stnmineit in outline, l)ul i.-^ iniutli l;iri;<'i', licavicM', and more 

 hrittlo, and has a much mofe decided cancclhitc sculpture. 



Kare in upper San Pedro series at San Pedro, hut rather common at Los 

 Cerritos in tlie same horizon. The specimen fi<i;nred is from the upper San Pedro 

 serie.« at Los Cerritos, and is now in the collection of Dclos Arnold. 



Living. — jMonterey to San Dieijo (Carpenter). 



Phiatocene. — San Pedro (Arnold). 



88. Tapes staminea Conrad 



Pi.ATK XIV, Fig. 4. 



Venus slaminea Con., Jour. I'iiil. Acad. Sci., Vol. VII, 1837, p. 250, PI. XIX, fig. 15, 

 Tapes slaminea Con., Carpenter, Brit. Assn. Rept., 1S63, p. 641; =-^ V. lamcllifcra Con., (Jour. Phil. 

 Acad., Vol. VII, 1837; not of Wilkes' Exped.); =T. divcrsum CoN.; =^7". lincatum 

 Con.; = Veiius rigida Gld. {_fide Gabb, Pal. Cal., Vol. II, j). 97, 1869). Cooper, 7th 

 Ann. Rept. Cal. St. Min., 18S8, p. 266. Keep, West Co.ist Shells, p. 185, fig. 15S, 

 1892. Williamson, Proc. U. S. Nat. Mus., Vol. XV, 1892, p. 188. 



Shell of medium size and thickness, suboval, convex; surface sculptured with numerous, crowd- 

 ed, rounded, radiating ridges, and concentric lines, which are most prominent on anterior end; nolunule; 

 margin sometimes crenulated; hinge narrow; ligament narrow, long; three teeth in each valve; 

 posterior two in right valve and middle one in left valve bifid; pallial sinus long, rounded; muscle- 

 impressions not sunken. 



Dimensions. — Long. 50 mm.; alt. 42.5 mm.; diam. 30 mm. 



This is a variable species, the shape of the shell and the sculpture varying in 

 different individuals. The form above described is the most common in the San 

 Pedro beds. Specimens identified by Dr. Dall. 



Kare in the lower San Pedro series at Deadman Island and San Pedro; 

 common in the upper San Pedro series at Deadman Island, San Pedro, Los Cerritos, 

 Crawfi.sh George's and Long Beacli. The specimen figured is from the upper San 

 Pedro series of San Pedro and is now in the collection of Delos Arnold. Found in 

 the Pliocene at Pacific Beach and Russ School; and in the Pleistocene at Twenty- 

 sixth Street and Spanish Bight, San Diego. 



Living. — Straits of Fuca to Lower California (Cooper). 



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

 (Arnold). 



