no PROCEEDINGS OF THE ACADEMY OF [1881. 



the specimens T\^ere collected by Lord Walsingham, in Cnlifornia. 

 There are several varieties still nndescribed, which challenge the 

 attention of those who are ambitious in this direction. 



Garinifex exhibits manj^ of the variations in form of tube or 

 cone, in cross-section, which are seen in Planorbis, without the 

 bulgings of the varicose forms, and plus the elevation of spire 

 which is seen especiall}^ in extreme individuals like the figure ; 

 the outline of the mouth is very much like that of P. hicarinatus^ 

 and in some of its varieties suggests a P. hicarinatui<, with the 

 umbilicus deepened by pushing up the spire from below. With 

 the discovery of new localities, and ample material both recent 

 and fossil, without doubt the sequence of variation wall be traced, 

 and its relation to meteorological, geological and chemical changes, 

 within the area of its distribution partially indicated. 



In this connection I would direct attention to Prof. Hyatt's 

 interesting letter to Mr. Ingersoll, referring to Steinheim fossils, 

 and to the Valvatse of Lawlor's Lake, Nova Scotia, in Prof. 

 F. V. Hayden's Report, 1874. 



