1916] Moody: Fauna of the Fernando of Los Angeles 59 



CORBULA TENUIS, n.sp. 



Plate 2, Figures 4a, 46 



Univ. Calif. Coll. Invert. Palaeont., no. 11087. Type locality, Fourth and 

 Broadway, Los Angeles. 



Shell small, triangular, very thin, with prominent subcentral 

 prosogyrous beaks which are strongly incurved. Anterior end 

 elongated and evenly rounded ; posterior end rounded, but the 

 posterior portion of the shell possesses a posteriorly directed keel 

 passing from the umbo obliquely to the ventral margin which 

 sets off the posterior one-fourth of the shell from the remainder, and 

 makes a small angle within the posterior margin. A few indistinct 

 lines, radiating from the beak, are seen on this posterior one-fourth 

 of the shell ; the remaining portion is smooth, except for very fine 

 incremental lines. In the right valve appears one prominent cardinal 

 tooth anterior to the small cartilage-pit ; the anterior dorsal margin is 

 produced into a sharp lamellar plate. The anterior adductor scar is 

 elongate, but the posterior is unknown ; pedal scar distinct, situated 

 above the adductor. The left valve is unknown. 



Dimensions. — Altitude, 7.8 mm. ; diameter, 8.6 mm. 



The extreme delicacy of shell in this species is one of its most 

 distinctive features. The outline, while rather imperfectly shown in 

 the figures, is also quite distinct from that of any known Corbtila. 



Two rather imperfect right valves were found. 



