1922] Packard: New Species from Santa Ana Mountains 421 



EXOGYEA CALIFORNICA, n. sp. 

 Plate 27, figure 5 

 Type specimen 12320, Coll. Invert. Palae., Univ. Calif., loc. 2143. 

 Shell small, much higher than long; irregular in outline. Umbones prominent 

 with an umbonal ridge extending to the base. Surface marked by crude radi- 

 ating ribs. 



It is possible that this form is the same species as the specimen 

 from Point Loma, California, that Gabb incorrectly determined as 

 the eastern species E. costata? 



Horizon. — Chico group, Actaeonella oviformis zone. 



Family Limidae 

 Genus LIMA (Bruguiere) Cuvier 

 LIMA SUBNODOSA, n. sp. 

 Plate 28 



Type specimen 12275, Coll. Invert. Palae., Univ. Calif., loc. 2149. 



Shell very large, nearly equivalve; anterior dorsal margin sloping in a 

 straight line from the beaks to a point about midway from the beaks to the 

 base. Anterior end evenly rounded; base arcuate; posterior dorsal margin 

 apparently curves convexly from the small beak toward the posterior extremity, 

 which appears to be broken. Anterior ear long, the dorsal margin sloping 

 slightly; posterior ear broken. Surface of the valve ornamented by numerous 

 fine ribs becoming obscured toward the base by radial rows of nodes on some 

 of the stronger ribs. These nodes extend from 3 to 5 millimeters above the 

 surface from which they rise. Length of type, 140 mm.; height, 150 mm.; con- 

 vexity, 30 mm. 



Horizon. — Chico group, zonal position uncertain. 



Family Pectinidae 

 Genus PECTBN Miiller 

 PECTEN 1, sp. 

 Plate 27, figure 6 

 Type specimen 12321, Coll. Invert. Palae., Univ. Calif., loc. 2138. 

 An impression of a peculiarly sculptured form, presumably a pelecypod, was 

 obtained at locality 2138. Its distinctive sculpture has not been recognized as 

 occurring on any known Cretaceous species. The impression consists of about 

 18 grooves radiating from an apex, separated by flat-topped ridges, every other 

 one of which is slightly more prominent. The grooves are pitted at frequent 

 but irregular intervals, indicating that the radiating ribs bore many blunt 

 spines. The outline of the impression is irregular, due to the state of preser- 

 vation. It recalls that of a Pecten, except for the lack of the ears. 



Horizon. — Chico group, Actaeonella oviformis zone. 



