98 



University of California Publications. [Geology 



This seems to be a characteristic Monterey Miocene species, 

 most abundant in the middle portion of that formation, but also 

 found iu the lower and upper part, and in the lowermost San 

 Pablo. 



aeca camuloensis, new species. 



Plate 10, Figs. 6 and 6a; PI. 11, Figs. 66 and 6c. 



Description. — Shell quadrate to circular, height only slightly 

 less than length, (adult 90x98 mm.), almost equilateral, thick- 

 ness through closed shell nearly equal to height. Beaks not 

 widely separated, very slightly turned forward, and greatly 

 incurved over a wide and flaring ligament area. Ribs about 32 

 in number, rounded and without grooves, considerably wider 

 than the interspaces, and crossed by regular ridges, which give 

 them a beaded structure. At about the ninth rib from the pos- 

 terior end is a very distinct shoulder, from which there is a steep 

 concave slope to the posterior margin. 



Occurrenc( <t»<l Associated Fauna. — .1. camuloensis occurs 

 near Camulos, Ventura County, in the Puente Hills, Los Angeles 

 County, and in the foothills of the Santa Ana Mountains. 

 Associated fauna five miles northeast of Camulos: 



Cancellaria, n. sp. dementia subdiaphana Carpt. 



Cardium, Lndet. Fusus ambustus Old. 



Chrysodomm, n. sp. Lutricola alta Conr. 



Conns calif amicus Hds. Natica (Lunatia) lewisii ({Id. 



Nassa calif oriiiava Coin-. Nucula, n. sp. 



Natica, sp. indet. Ostrea veatchii Gabb. 



Pachypoma, n. sp. Pecten cerrosensis Gabb. 



Turritella, n. sp. Priene oregoneiisis Kedf. Bp. 



Acila castrensis lids. 



It is reported from the Puente Hills* associated with a fauna 

 determined as of Pliocene age. This form is not distantly removed 

 from .1. grandis, but can be distinguished from it by both the 

 form of the shell and the character of the ornamentation. 



Pull. X,.. 19, Calif. State Mining Bureau, pp. 220-222. 



