LOWER CRETACEOUS DEPOSITS CALIFORNIA AND OREGON

debcbiption of bpecie8 183
walls steep, rounded above to the slightly flattened sides; surface marked by 9 or
10 slightly sinuous, rounded varices, which become more prominent near tbe periphery,
most of which are bordered by Bhallow grooves; interspaces occupied by 12 or
more fine radial costae, more pronounced on the outer part of the whorl; suture linos
FIQCKE 3.—SUTURE fines
1—Of Aamtttftlln pnrthrf nor. Dnim from Iba lutlatyp*. p. 173, pL 33.
J—Of Piuooa ifiJIm (AwtoiwD). p. Its, pi. 41.
Partial tutor* lira cf AcmUo^&r DOT. Dt*vt> frotn baklypi. p. 171, pi, 33.
i—0! SeiiMratfe tUnteni CAadanoo). Drawn tram youm adult example. Uunum of PftlecnWlajy,
Unmil7 of California. p. 194, pi. At.
5—Of Ctemiarat teamim (AadorMa). p. 18t, pi 47.
8—01 F«#na mi«v4