THE NAUTILUS. 41 



species of the Santa Clara Lake beds. Cooper' listed it as Cari- 

 nifex newherryi var. minor, which he had described previously, from 

 Clear Lake (living). The two have nothing specific in common 

 except their size. 



Associated with these two species at various points about the val- 

 ley are the following species still living in northern California : 



Anodonta cygnea nuttalliana Lea. 



Anodonta angulata Lea. 



Pompholyx eff'usa Lea. 



Valvata virens Tryon. 



In addition there are several indeterminate forms, an excellent 

 flora, and fragments of mammalian bones. 



The figure, which will appear in a later issue, represents the type, 

 X 2, from a photograph by John Howard Paine, of Stanford Uni- 

 versity. 



Stanford University, Cal. 



NOTE OH PLAN0EBI8 BINNEYI TBTON. 



BT FHANK COLLINS BAKER. 



Mr. Winkley's note on " Variation" in the last Nautilus is very 

 interesting, and most of the examples given are characteristic. On 

 page 16, however, there is a reference to Planorhis which shows that 

 several species have been confused. The Dalton shells are binneyi 

 and i)ot trivolvis, as I have ascertained recently from an examination 

 of specimens in the Boston Society of Natural History, received 

 from Mr. Winkley. 



This large Planorbit, surpassed only by the tnagnijlcus of Pilsbry, 

 has often been confused with trivolvis, most authors overlooking 

 Tryon's reference to this species in his review of Binney's work in 

 the American Journal of Conchology. 



P. binneyi IB a northern form, in many localities replacing trivolvit. 

 I have collected it in Tomahawk Lake, Wisconsin, and in the St. 

 Lawrence River at Thousand Island Park. It may be known by its 

 large size, very wide whorls and pronounced longitudinal sculpture. 

 Specimens of the same size are much wider than trivolvit and more 



' Cooper, J. Q., Proc. Cal. Acad. Sci. (2), iv, p. 172, 1894. 



