270 PALEONTOLOGY OF CALIFOKNIA. 



KEMONDIA, N. Gen. 



Shell compressed, elongate subqnadrate, closed at the extrem- 

 ities (or perhaps slightly gaping posteriorly). Ligament very 

 short, external. Hinge composed of three radiating cardinal 

 teeth in each valve, and a long posterior tooth in the left, with a 

 corresponding tooth in the right. The middle cardinal of the 

 left valve is transversely striate, as in Trigonia, and is slightly 

 grooved on its face, the anterior is linear and smooth, and the 

 posterior is also smooth, at least on its posterior face. The 

 posterior lateral, and its corresponding cavity, are irregularly 

 rugose. In the right valve, the anterior tooth is as large as the 

 middle, the posterior is linear; further details unknown. 



This genus is evidently closely allied to Trir/onia, its quadrate form not being 

 unlike many of the species of that genus, and the transversely striate teeth 

 showing a marked resemblance. I am unable to say, even with a large series before 

 me, whether the posterior end was closed or not. In every case the extremity is 

 more or less broken, and from the appearance of the most perfect specimens, it is 

 not improbable that there may have been a slight gaping of the lower portion of 

 the posterior margin. 



In giving the above name to this genus, I take great pleasure in at least fulfilling 

 a promise, made three or four years ago, of dedicating it to my old friend Auguste 

 Eemond de (Jorbineau, who was cut off almost at the commencement of a career, 

 that promised more than ordinarily brilliant results, and whose untimely death 

 was mourned by all who knew him. 



R. FURCATA, n. S. 



PL 36, Fig. 17, 17 a. 



Shell thick, elongate, subquadrate, compressed; beaks small, 

 prominent, placed not quite a third of the length from the anterior 

 end, which is narrowly rounded in the middle and retreats rapidly, 

 nearly straight above, and convex below ; cardinal margin very 

 slightly concave, nearly parallel with the base ; base faintly sinu- 

 ous, broadly convex in advance, straight to concave posteriorly; 

 posterior end concave in the middle, prolonged into two blunt 



