1922 \ Packard: New Species from Santa Ana Mountains 425 



CAEDIUM (PEOTOCAEDTA), sp. 

 Plate 31, figure 4 

 Type specimen 12283, Coll. Invert. Palae., Univ. Calif., loc. 2177. 



Several imperfectly preserved specimens of CarcKum were obtained 

 in the fauna that do not appear to have been described. The type is 

 represented by a finely perfect cast, and another on the same piece of 

 rock shows a type of sculpture consisting of many fine grooves bor- 

 dered by a ridge with wavy lateral margins. These ridges occur on 

 the cast, thus indicating the identity of the two specimens. 



The shell is nearly equilateral, very tumid, and somewhat quadri- 

 lateral in outline. 



This form recalls C. sagittatus Gabb in general shape, but it differs 

 from that species in the character of the sculpture. The dimensions 

 of the specimen figured are : height, 18 mm. ; length, 18 mm. ; con- 

 vexity, 8 mm. 



Horizon. — Chico group. 



Family Veneeidae 

 Genus MERETRIX Lamarck 

 MEEETEIX ANGULATA, n. sp. 

 Plate 33, figure 5 



Type specimen 12307, Coll. Invert. Palae., Univ. Calif., loc. 2136. 



Shell medium sized; inequilateral; posterior dorsal slope nearly straight; 

 anterior end evenly rounded; posterior extremity truncated; base broadly 

 rounded. Umbones tumid, with blunt beaks. Anterior dorsal margin slightly 

 excavated underneath the beak; lunule ill-defined; a prominent ridge extends 

 from the beak to the posterior ventral margin ; inner margin smooth, hinge 

 showing, imperfectly, three cardinals and two laterals. Length of type, 59 mm.; 

 height, about 45 mm.; convexity, 15 mm. 



Horizon. — Chico group, Turritella pescaderoensis zone. 



MEEETEIX NITBDA (Gabb) var. MAJOE, n. var. 

 Plate 33, figure 2 



A large specimen, no. 12279, that has the general form and proportions of 

 the typical species but differs from it in its relatively thicker shell and very 

 much larger size was obtained from University of California locality 2169. 

 None of the several specimens referred to this variety shows the hinge, so that 

 there is some uncertainty as to its true affinities. Length of type, 77 mm.; 

 height, 71 mm.; convexity, 22 mm. 



Horizon. — Chico group, Tellina ooides zone. 



