HIKUDIKEA AND OLIGOCHJiTA OF THE GREAT LAKES KEGION. 168 



HERPOBDELLlD.f. 



Erpobdella punctata ( Leidy). 



Abundant throughout the lake region. (PI. x.xxii, fig. 1.) 

 (5(() South Bass Ishmd, Ohio, pond near hatchery, July 6, 1899. 

 (7((, 8'(, 9a) South Bass Island, Ohio, Lemna Pond, July 6, 1899. 

 (33n) South Bass Island, Ohio, East Swamp, July 10, 1899. 



(43) South Bass Island, Ohio, August 17, 1898; shore. 

 (45) Put-in Bay Island, Ohio, Squaw Bay, August 15, 1898. 

 (67) Put-in Bay, Ohio. August 12, 1898; under rocks. 



(S9<(, 90a) North Bass Island, Ohio, swamp, August 22, 1898. 



(111(0 Middle Bass Island, Ohio, North Swamp, July 24, 1899. 



(115) South Bass Island, Ohio, swamp near East Point, August 24, 1899. 



(118) South Bass Island, Ohio, August 22, 1898. 



(127) South Ba.ss Island, Ohio, September 10, 1898; shore. 



(135; Put-in Bay, Ohio, September 13, 1898. 



(136n) North Bass Island, Ohio, swamp, July 21, 1899. 



(19.5a) North Bass Swamp, Ohio, July 21, 1899. 



(266(i) Erie, Pa., Graveyard Swamp, August 14, 1899; on stones ami flags. 



(36.5n) Long Point, Canada, August 21, 1899. 



(403(() Long Point, Canada, August 24, 1899. 



(438a) Rondeau Harbor, Ontario, East Swamp, August 28. 1899. 



Dina fervida (Verrill). 



Quite as plentiful as E. punctata, but apparently most abuadant at the eastern end of the lake. 



(PI. xx.xii, fig. 6.) 

 (60) South Bass Island, Ohio, Lemna Pond, July 6, 1899. 



(44) South Bass Island, Ohio, pond near hatchery, August 16, 1898. 

 (124a) Sandusky, Ohio, East Harbor, July 28, 1899. 



(191a) Sandusky, Ohio, East Harbor, August 7, 1899. 



(219a, 220a) East Harbor, Ottawa County, Ohio, near Lakeside, August 4, 1899; on flags. 



(266a) Erie, Pa., Graveyard Swamp, August 14, 1899; from stones and flags. 



(271a) Erie, Pa., north shore, August 17, 1899. 



(312a) Erie, Pa., Long Pond, Augustn5, 1899. 



(317a) Erie, Pa., August 16, 1899. 



(333a) Long Point, Canada, near boat landing. August IS, 1899. 



(342a) Long Point, Canada, August 16, 1899. , 



(365a) Long Point, Canada, August 21, 1899. 



(437(7, 438a) Rondeau Harbor, Ontario, East Swamp, August 28, 1899. 



Dina microstoma :Moore. 



In striking contrast to the abundant Dina ftrrida this species was found singly at but two stations. 



East Harbor, Ottawa County, Ohio, August 5, 1898; on Chara. 



(266a) Brie, Pa., Graveyard Swamp. August 14, 1899; on stones with D. fervida. 



II. OLIGOCHiETA. 



ThLs report i.s based upon collections nnide on Lake St. Clair in 1893, and on the 

 upper end of Lake Michigan and the .small lakes south of the Strait of Mackinaw 

 in ISW by a party sent out by the Michigan tish commission, and bj- the biological 

 survey of Lake Erie under the auspices of the United States Fish Commission in 

 1899. Both parties were under the direction of Prof. Jacob Reighard, by whom the 



