MUSSEES AND (PECTENS 27 
engraving was made was taken from the San 
Joaquin River. 
Dr. Isaac Lea described three other species from 
this part of the country, all of which are closely 
related, and which Dr. Stearns regards 
rb) 
(ag: Vari- 
eties of one and the same species.’’ If we take the 
same view, they will all belong to nuttalliana, as 
that species was described first. I will give, how- 
ever, Dr. Lea’s original description for each of the 
three. The names will indicate where the speci- 
mens were originally collected. 
Anodonta wahlamaténsis, Lea, the Willamette 
Anodon. ‘‘Shell winged, triangular, somewhat 
inflated, inequilateral; valves thin and connate; 
beaks rather compressed and undulated at the 
