i66 College of Forestry 



*38. Pisidium scutellatum cristatum Sterki. 



More common than the typical form and occurrinjj; usually 

 with it on the same bottoms and de])ths of water. 



*39. Pisidium splendidulum Sttrki. 



Specimens of this s]>ecies occurred on a clay hollom in li\e 

 feet of water in one habitat. 



40. Pisidium variabile Prime. 



b\)nnd in water two to 13 feet dee]) on i^ravel, sand, clay, and 

 mud bottoms. More abundant in mud from four to 1 1 feet 

 of water. The individuals are smaller than normal. 



*4i. Pisidium vesiculate .Sterki. 



Specimens were found in two habitats, both with mud bot- 

 toms, in <S and 11 feet of water. While the specimens found 

 are undoubted vestieitlare they are not characteristic of the 

 species. 



42. Pisidium species. No. 217^. 



43. Pisidium species. No. 2i7h. 



44. Pisidium species. No. 21/1. 



45. Pisidium species. No. 217J. 



Undetermined species of Pisidia collected in 1915 (Baker, 

 '16, p. 263). These have not yet been classified. 



*46. Pisidium species. 



A number of small and minute Pisidia collected in \()\() are 

 still in the hands of Dr. Sterki and await identification (see 

 tables numbers 17-22, 34 for the field numbers). They are 

 either peculiar forms of well-known species or are undescribed, 

 and several s])ecies may be represented. Df the material col- 

 lected in ]Cji5 Dr. Sterki says: " You should have 30 species 

 or more of Spho'riidcc in your vicinit}'; and there ought to be 

 more than 20 species (plus varieties) of Pisid'iuui." With the 

 ir)i6 material we nearly reach Dr. Sterki's estimate of proba- 

 bilities — 26 species of the family named and six unnamed. 

 Of Pisidhun there are 18 named species and fi\e imnamed. 



