542 PROCEEDINGS OF THE NATIONAL MUSEUM. vol. xxxii. 



Fig. 3. Scutella fairbanJcsi Merriam. Cat. No. 164963, U.S.N.M. View of top, show- 

 ing details; maximum diameter 36 mm. ; 1 J times natural size. Lower Mio- 

 cene, supposed equivalent of Vaqueros formation, near Torrey Canyon wells, 

 southwest of Piru, Ventura County; abundant. This species is also found 

 near the base of the Vaqueros formation in the Sespe district. Supposed 

 to be characteristic of the lower Miocene. 



Plate XLIII. 



Fig. 1. Venus [Chione) temblorensis Anderson. Cat. No. 164989, U.S.N.M. Exterior 

 of imperfect right valve; longitude 80 mm. Lower Miocene, head of 

 Tojianga Canyon, 3 miles south of Calabasas, Los Angeles County. Usually 

 abundant in the lower Miocene; a nearly related, possibly identical, form 

 found in the upper Miocene, 

 la. Top view of same specimen. 



2. Miitilus matliewsomi Gabb var. expansus, new variety. Cat. No. 164968, 



U.S.N.M. Holotype. Right valve; altitude 10. T) mm. Lower Miocene, 

 supposed equivalent of the Vaqueros formation, near Torrey Canyon wells, 

 southwest of Piru, Ventura County. This species is usually found in the 

 faunas of the lower Miocene through central and southern California. 



3. Scutella fairbanksi Merriam. Cat. No. 164963, U.S.N.M. Same locality as 



fig. 2, but possibly at a somewhat lower horizon. 



4. Ocinebru iopangcnsis, new species. Cat. No. 164995, IT.S.N.M. H ilotype. 



Back view; altitude 59 mm. Lower Miocene, Topanga Canyon, 3 miles 

 south of Calabasas, Los Angeles County. So far known only from this 

 horizon. 



Plate XLIV. 



Fig. 1. Pecteii (Lyropecten) crassicardo Conrad. Cat. No. 164967, U.S.N.M. Exterior 

 of valve, showing characteristic sculpture; altitude 90 mm. Lower Miocene, 

 Ojai Valley, Ventura County. This species ranges through the lower and 

 upper Miocene, being commoner in the former in southern California, in 

 the latter in central California. It is sometimes more convex than the 

 figured specimen, and often shows concentric undulations of the disk. 



2. Pecten (Clilamys) sespeensis var. hijdei Arnold. Collection of Delos Arnold. 



Type. Right valve, ear missing; altitude 46 mm. Lower Miocene, 

 Lynchs Mountain, San Luis Obispo County. Found also in the Vaqueros 

 formation. Little Sespe Creek, and, with Myiilus maOieivsonii Gabb, in sui> 

 posed equivalents of the Vaqueros formation near the Torrey Canyon wells, 

 Ventura (bounty. 



3. Peden [Pseudamusium) peckhaiid Gabb. Cat. No. 164839, U.S.N.M. Right 



and left valves in matrix; altitude of largest 17 mm. Monterey shale 

 (middle Mio(,'ene) , southeast of Pinole, Contra Costa County. The type of 

 this species came from the Ojai Valley, Ventura County. It is the com- 

 monest form in tlie shales of the middle Miocene (Monterey, Modelo, and 

 equivalent formations) and is also known from the Oligocene in the Santa 

 Cruz Mountains. 



4. Neverita callosa Gabb. Cat. No. 164992, U.S.N.M. View from above, speci- 



men slightly tilted; maximum latitude 44 mm. Lower Miocene, head of 

 Topanga Canyon, 3 miles south of Calabasas, Los Angeles County. Ranges 

 through the Miocene. Common in the lower Miocene of southern San 

 Joaquin Valley and the Santa Monica Mountains. 

 4a. View of base and aperture of same specimen, showing characteristic shape 

 of callous. 



