cockerell: notes on land and freshwater mollusca. 257 



Physa cooperi Tryon. California (T. H. Aldrich). Seems 



specifically identical with eUiptica Lea. 

 P. fontinalis var. bulla Miill. Patschkau. A pale form 



with a very short spire; rather inflated; columella white. 



One specimen has white linear marking. 

 Limnasa distorta Rossm. Petersburgh, Mich. (Jerome 



Trombley). Large and elongate palustris, belong with 



corviis Gmel. Aperture tending to be reflected below. 



Shell long., 30^; lat., 11 mill. 

 L. stagnalis var. palustriformis Kob. Weidenau, Silesia. 



These shells are certainly var. compressa Ckll., but they 



may not be palustriformis. Before compressa was named, 



Mr. Ponsonby sent examples to Dr. Kobelt, who seemed 



to regard them as new, and said nothing about their being 



palustriformis. Of course palustriformis is the name to be 



adopted before compressa if the two are really synonymous. 

 Bulinus hypnorum var. tryoni Curr. Grand Rapids, 



Mich. lyj mill, long, rather broad than otherwise, very 



shiny, fawn colour. Aperture, 10 mill. long. Very near 



to var. major Charp. 

 Limnaea peregra var. microstoma Kob. Heinzendorf, 



East Germany (Jetschin). 14I mill, long; apert., %\ mill. 



long. ; whorls rather convex, horn colour, shiny. Shell 



rather thick, spire long. This is a form of var. intermedia 



Fer. 

 L. umbrosa Say. Erie Canal, New York. A form oi palus- 



tris, distinguished by its palish colour and deepish suture. 

 L. palustris var. fusca C. Pfr. Patschkau, Silesia. Small 



(15 mill, long), brown palustris. In texture and form 



rather approaching glabra. 

 L. pallida Ad. Onondaga Lake, New York. Much like the 



white var. of palustris. Certainly not triincatula var. 



elegans which it has been referred to. 

 L. glabra var. subula Kics. Vegesack, Germany. Small 



rather broad glabra, 7 mill. long. Shape reminds one of a 



