I 922 ] Packard: New Species from Santa Ana Mountains 423 



Family Pholadomyacidae 



Genus HOMOMYA Agassiz 

 HOMOMYA HAEDINGENSIS, n. sp. 

 Plate 32, figures la and lb 



Type specimen 12291, Coll. Invert. Palae., Univ. Calif., loc. 2134. 



Shell large, equivalve; inequilateral; posterior extremity elongated, evenly 

 rounded; anterior extremity broadly rounded. Umbones very tumid, the beaks 

 being distant and markedly curved anteriorly. Shell ornamented on the umbones, 

 at least, by fine, smooth, equidistant concentric ridges. Length of type, 100 mm.; 

 height, about 75 mm.; diameter, 70 mm. 



Horizon. — Chico group, Aeateonella oviformis zone. 



Family Anatinidae 



Genus ANATINA Lamarck 

 ANATINA (?), sp. 

 Plate 31, figure 5 • 



Type specimen 12286, Coll. Invert. Palae., Univ. Calif., loc. 2162. 



Shell small, elongate; anterior dorsal margin slightly excavated; anterior 

 end broadly produced; posterior dorsal margin slopes gently to the bluntly 

 pointed posterior extremity. Umbones inconspicuous; beaks sharply pointed. 

 Surface of shell unknown since the specimen is little more than a cast; anterior 

 adductor scar large and deeply impressed. Length of specimen, 21 mm.; height, 

 14 mm.; convexity, 3 mm. 



Horizon. — Chico group, Turritella pescaderoensis zone. 



Family Astartidae 



Genus ASTARTE Sowerby 

 ASTAETE LAPIDIS, n. sp. 

 Plate 30, figures 4a and 4& 



Type specimen 12285, Coll. Invert. Palae., Univ. Calif., loc. 2135. 



Shell small, nearly circular in outline, slightly inequilateral; rather tumid. 

 Anterior dorsal margin concave, set off by an ill-defined lunule; anterior end 

 and base rounded, forming neaily a segment of a circle; posterior dorsal margin 

 convex, meeting the even curve of the base and the posterior end at a point 

 about halfway to the ventral margin. Beaks inconspicuous, pointed. Shell 

 thick, ornamented by rough lines of growth. Hinge plate heavy with a promi- 

 nent, anterior, cardinal tooth. Length of type, 20 mm.; height, 20 mm.; con- 

 vexity, 8 mm. 



This species is represented by several specimens, all of which are 

 quite uniform as regards general shape. 



Horizon. — Chico group, Turritella pescaderoensis zone. 



