NO. 1545. NEW FOSSIL MOLLUSKS FROM CALIFORNIA— ARNOLD. 541 



Fig. 7. Cerithium topangensis, new species. Cat. No. 164976, TJ.S.N.M. Holotype. 

 Aperture view of imperfect specimen ; longitude 23 mm. ; 1 5 times natural 

 size. Lower Miocene, 3 miles south of Calabasas, at head of Topanga 

 Canyon, Los Angeles County. A common species at the type locality. 



8. Cerithium topangensis, new species. Cat. No. 164976, U.S.N.M. Cotype. 



Aperture view of imperfect specimen; longitude 13 mm.; IJ times natural 

 size. Same locality as tig. 7. 



9. Cancellaria cf. condoni Anderson. Cat. No. 164981, U...S.N.j\L Back view of 



imperfect specimen; altitude 21 mm.; H times natural size. Lower Mio- 

 cene, 3 miles south of Calabasas, Los Angeles County. This species 

 appears to range from the San Joaquin Valley to the Santa Monica Moun- 

 tains in the lower Miocene. 



Plate XLI. 



Fig. 1. Pecten {Lyropecten) magnolia Conrad. Collection Univ. California. Imper- 

 fect right valve; altitude 14.5 mm.-. about two-thirds natural size. Lower 

 Miocene, Vaqueros formation, Ojai Valley, Ventura County. Characteristic 

 of the lower Miocene throughout central and southern California. The left 

 valve has narrow, more rounded ribs. 



2. Pecten {Lyropecten) estrellanns Conrad. Cat. No. 164851, U.S.N.M. Left 



valve; altitude 97 mm.; about two-thirds natural size. Upper Miocene, 

 Wildhorse Canyon, Monterey County. This species is usually abundant in 

 both the lower and upper Miocene faunas of central and portions of south- 

 ern California. Ribs of right valve broader and anterior ear notched; other- 

 wise similar to left. 



3. Drillia sp. Cat. No. 164977, U.S.N.M. Back view; longitude 13.5 mm.; 



about IJ times natural size. Lower Miocene, head of Topanga Canyon, 3 

 miles'south of Calabasas, Los Angeles County. 



4. Macron merriami, new species. Cat. No. 164982, U.S.N.M. Holotype. 



Aperture view; longitude 23 mm.; about 1^ times natural size. Lower 

 Miocene, same locality as tig. 3. This species appears to range over central 

 and southern California in the lower Miocene. 

 4(t. Back view of same specimen. 



5. Sigaretus perrini, new species. Cat. No. 164979, U.S.N.M. Holotype. 



Aperture view of partially decorticated and imperfect specimen; altitude 



18.5 mm.; about 1^ times natural size. Lower Miocene, same locality as 



fig. 3. 

 6.. Turbo topangensis, new species. Cat. No. 164980, U.S.N.M. Holotype. 



Aperture view; altitude 18.5 nun.; about IJ times natural size. Lower 



Miocene, same locality as fig. 3. 

 6a. Top view of same specimen. 

 66. Base view of same specimen. 



Plate XLII. 



Fig. 1. Pecten {Amusium) lompocensis Arnold. Cat. No. 164852, U.S.N.M. Para- 

 type. Interior view, showing internal lirse; altitude 90 mm.; about two- 

 thirds natural size. Lower Miocene, Ojai Valley, Ventura County. This 

 form, so far as known, is confined to the lower Miocene of Santa Barbara 

 and Ventura counties. 



2. Ostrea eldridgei, new species. Cat. No. 164986, U.S.N.M. Holotype. View 

 of exterior of larger valve; altitude 14.7 mm.; two-thirds natural size. 

 Lower Miocene, supposed equivalent of Vaqueros formation, Elkins ranch, 

 east of Grimes Canyon, south of Fillmore, Ventura County. 



2a. Lateral view of same specimen. 



