Fic. 1. 
EXPLANATION OF PLATE XXXVI. 
PURISIMA AND MERCED (UPPER MIOCENE AND PLIOCENE) FOSSILS. 
Cardium meekianum Gabb, L.S8.J.U., No. 1098. Decorticated left valve; 
altitude, 73 mm. xX 1. Merced formation, upper Pliocene, locality 
A 11, 1 mile southwest of Capitola, Santa Cruz County. A common 
species in the upper Miocene and Pliocene. 
. Chlorostoma stantoni Dall, var. lahondaensis, new variety, type, L.S.J.U., 
No. 1079. Back view of a Slightly imperfect specimen; altitude, 21 
mm. X 1. Purisima formation, locality No. 150, Pescadero Creek 
just above Jones Gulch, p. 388. 
. Thais trancosanda, new species, type, L.S.J.U., No. 1082. Aperture view 
of imperfect specimen; altitude, 283 mm. X 1. Merced formation, 
upper Pliocene, locality 21, between Feld Lake and Los Trancos 
Creek, 24 miles south-southwest of Stanford University, p. 388. 
. Arca schizotoma Dall. L.S.J.U., No. 1090. A nearly perfect right valve; 
length, 56 mm. X 1. Merced formation, upper Pliocene, locality A 11, 
Same as fig. 1. Closely allied to Arca trilineata Conrad and Arca 
canalis Conrad. 
. Tapes staleyi Gabb, L.S.J.U., No. 1094. Right valve, length, 46 mm. X 1. 
Merced formation, upper Pliocene, locality A 11, same as fig. 1. A 
common:‘species in the Pliocene of central and northern California. 
. Nassa californiana Conrad, L.S.J.U., No. 1095. Aperture view; altitude, 
31 mm. X 1. Merced formation, upper Pliocene, locality A 11, same 
as. fig. 1. Another common species in the Pliocene. 
; Thais ostrina Gould, L.S.J.U., No. 1096. Aperture view of imperfect 
specimen ; altitude, 28 mm: X 1. Merced formation, upper Pliocene, 
locality No. 21, same as fig. 38. Also found recent. 
. Astyris richthofeni Gabb, Cat. No. 165468, U.S.N.M. Aperture view; 
altitude, 8 mm. X 3. Purisima formation, lower Pliocene, locality 
No. 189, Purisima Rock, 1 mile east of Ano Nuevo Point. Common 
in the Pliocene. 
. Cryptomya ovalis Conrad, L.S.J.U., No. 1097. Left valve; length, 28.5 
mm. X 1. Purisima formation, locality No. 10, Madera Creek near 
confluence with Tusk Gully, 2 miles southwest of Mayfield. Com- 
mon in the upper Miocene and Pliocene. 
a 
