294 MICHIGAN SURVEY, 1908. 



Eange: "From New England and Virginia westward to Missouri and 

 northward." ( D all ) . 



Michigan : Generally distributed. 



Isle Royale: III, 2, Small Island in Eock Harbor, No. 89; III, 3, 

 Bulrush Zone at western end of Rock Harbor (Nos. 160, 163). 



In the mud in deep water at the head of Eock Harbor (Nos. 160, 

 163). 



51. Valvata lewisii Currier. 



Eange : "Northern United States from Atlantic to Pacific and North- 

 ward." (Dall). 



Michigan: Generally distributed. 



Isle Eoyale: Not collected in 1905. See Eeport Exped. 1904, p. 98, 

 cited as Valvata sifu;era lewisii. 



52. Valvata sincera nylamleri Dall. 



Eange: Northern United States from Maine to Wisconsin. 



Michigan : Isle Eoyale and Marquette County. 



Isle Royale: III, 2, Small Island in Eock Harbor, No. 89; III, 3, Bul- 

 rush Zone at western end of Eock Harbor, Nos. 159, 160, 163, 164; V, 

 6, South Shore of Siskowit Lake, No. 220. 



With Valvata tricarinata at the head of Eock Harbor and in shallow 

 water in Siskowit Lake (No. 220), especially abundant on the lower 

 side of water-lily leaves. 



53. Amnicola limosa (Say). 



Range: "Virginia to Wisconsin and Hudson Bay." (Dall). 

 Michigan: Generally distributed. 



Isle Eoyale: V, 6, South shore of Siskowit Lake, No. 220, living in 

 company with the preceding species under water-lily leaves. 



54. Amnicola lustrica Pils. 

 Eange: Northern United States. 

 Michigan:. Generally distributed. 



Isle Eoyale ; III, 2, Small Island in Eock Harbor, No. 89 ; III, 3, Bul- 

 rush Zone at western end of Eock Harbor, Nos. 159, 160, 163, 164. 



In muddy bottom in deep water (3-5 feet deep) at the head of Eock 

 Harbor. 



55. Iximpsilis luteola (Lam). 



Eange: "Entire Mississippi drainage and north to the Eed Elver of 

 the North." (Dall). 



Michigan: Generally distributed. 



Isle Eoyale: V. 6, South shore of Siskowit Lake, Nos. 210, 211, 218. 



Some of the specimens collected are very similar to the form from the 

 Beaver Islands, Lake Michigan, referred to Lampsilis Ixyrealis Gray, but 

 they are connected by intermediate specimens with the more typical 

 form and seem rather referable to this species than to 'boreal is. 



56. Anodonta grandis footiana Lea. 



Range: Northern United States and northward. 



Michigan : Generally distributed. 



Isle Royale: II, 4, McCargoe Cove, No. 52; III, 2, Small Island in 

 Rock Harbor, No. 89; III, 3, Bulrush Zone at western end of Rock 

 irarbor, No. 168 ; III, 4, near head of Trail to Sumner Lake, Eock Har- 

 bor," No. 93 ; III, 5, Sumner Lake, No. 154 ; III, 6, Southwest Coves of 

 Eock Harbor, Nos. 91, 91, 156; South Side of Eock Harbor, Nos. 109; 



