150 



MARINE AND FISHERIES 



5 GEORGE v., A. 1915 



the harbour. In the southern end of Georgian Bay, I do not know of it being taken 

 in shallower water than about 20 fathoms and, in Lake Ontario, Nicholson did 

 not obtain it in shallower water than about 30 fathoms. 



-<-\r--f---'-l>r 



Fig. 3. 



Localities. — Lakes Superior and Michigan (Smith). 



Georgian Bay: Near Pine Ids., 20 fathoms (Wa); East of South Watcher 

 Id., 20 to 25 fathoms; Rattlesnake Harbour, Fitzwilliam Id., 4^ fathoms (R and 

 Wo). 



Lake Ontario, near Toronto, 30 to 40' fathoms (Nicholson). 



Stomachs of whitefish from Lakes Superior and Michigan (Smith), from 

 Georgian Bay (Wa, C, R) ; Uranidea formosa (C) from Port Credit, Lake Ontario. 



In addition to the differences given in the key, this species can readily be 

 distinguished from our other Amphipods by the rudimentary condition of the 

 'hands' of the second gnathopods. Length up to 8 mm. 



Pontoporeia filicomis (Stimpson Mss.) 



Smith, 1874, p. 649; Weckel, 1907, p. 28. 



A single specimen was dredged by Stimpson in Lake Michigan near Racine 

 in 40 to 60 fathoms. It has not since been found. It is distinguished from the 

 preceding species chiefly by the very long antennae and antennulse, which are as 

 long or longer than the body. 



Genus Gammarus. 

 Key to the Species. 



Aj Terminal joint of outer ramus of last uropod without long plumose hairs on 

 outer margin G. fasciatus. 



Aj Terminal joint of outer ramus of last uropod with long plumose hairs on outer 

 margin • G. limnaeus. 



