COPEPOD PARASITES AND MUSSEL GLOCHIDIA ON FRESH-WATER FISHES. 363 



near the distal end with a small papilla like those in other species; the terminal joint is slender and is 

 tipped with a larger and a smaller claw, somewhat like a chela. 



Total length (larger specimens), 4.40 mm.; cephalothorax, 1.60 mm. long, 2.40 mm. wide; trunk, 

 2.75 mm. long, 3.30 mm. wide. Egg strings, 5.40 mm. long, 1.25 mm. wide. Bulla 1.65 mm. in diameter. 



Remarks. — It is gratifying to obtain new specimens of Dana's species, probably from the same host. 

 They confirm his description in all its essential features and enable us to supply the details of the 

 appendages which were lacking. They also establish the species beyond any doubt, as is shown by the 

 dorsal contoiu" of the cephalothorax, the general body form and proportions, and the details of the man- 

 dibles, second antennae, and first maxillae. 



Salmincola siscowet (Smith). 



LertuEopoda siscowii Smith, Report U. S. Commissioner Fish and Fisheries for 1872-73, pt. 2. p. 664, pi. 3. fig. 15, 16; Wilson, 

 Proc. U. S. Nat. Mus., vol. 47, p. 608, pi. 30, fig. 23-29. 



Host and record of specimens. — Seven females were taken from the gills of Crutivomer namaycush 

 siscowet at Outer Island, Lake Superior, by J. W. Milner; they are ntimbered 39597, U. S. National 

 Museum. 



Salmincola edwardsii (Olsson). 



LertKEopoda edwardsii Fasten, Report Wisconsin Commissioners of Fisheriesfor 1911-12, p. 11, 4unnumbered plates; Biol 



Bull., vol. 27, p. 116. pi. 1-3. 

 Salmincola edwardsii Wilson, Proc. U. S. Nat. Mus., vol. 47. p. 609, pi. 30, fig. 30-35. 



Host and record of specimens. — Twenty-five females (catalogue no. 43374, U. S. National Museum) 

 from gills of brook trout, Salvelinus fontinalis , at Wild Rose, Wis. Others have been obtained from the 

 same host at Caledonia, N. Y.; Houghton, Mich.; Northville, Mich.; St. Paul, Minn. 



Remarks. — This species often causes serious trouble in fish hatcheries, loading the gills of the trout 

 imtil they are suffocated and large numbers of them perish. Each of the lots mentioned above have 

 come from hatcheries thus aflBicted, and Fasten 's first paper gives an excellent account of the disease 

 produced in brook trout by this parasite. 



Salmincola oqtiassa Wilson. 



Salmincola oquassa Wilson, Proc. U. S. Nat. Mus., vol. 47, p. 611, pi. 31, fig. 36-40. 



Host and record of specimens. — Five females were obtained from the blueback trout, Salvelinus 

 oquassa, at Rangely Lakes, Me., November 27, 1884; they have received catalogue no. 39604, U. S. 

 National Museum. 



Salmincola bicauliculata (Wilson). 



Lcrnaopoda bicauliculata Wilson, Proc. U. S. Nat. Mus., vol. 35, p. 472, pi. 82. 

 Salmincola bicauliculata Wilson, idem, vol. 47, p. 612, pi. 31, fig. 41, 42. 



Host and record of specimens. — A single female was taken from a "trout" at Mapleton, Oreg., by 

 Dr. S. E. Meek in i8g6 and has received catalogue no. 38575, U. S. National Museum. 



Salmincola falculata (Wilson). 



LerntEopodafalculata Wilson, Proc. U. S. Nat. Mus., vol. 35, p. 473, pi. 83. 

 Salmincola faicuiata Wilson, idem, vol. 47, p. 613, pi. 31, fig. 43, 44. 



Host and record of specimens. — Four females from the gills of Oncorhynchus nerka at Baker Lake, 

 Wash., in 1902, catalogue no. 38586, U. S. National Museum. Three other lots were obtained by the 

 Btu'eau of Fisheries from trout in California, catalogue no. 38588, 38589, 38590, U. S. National Museum. 



Salmincola inermis (Wilson). 



Lerrusopoda inermis Wilson, Proc. U. S. Nat. Mus., vol. 39, p. 632, pi. 68. 

 Salmincola inermis Wilson, idem, vol. 47, p. 614, pi. 32, fig. 47-51. 



Host and record of specimens. — This species has been found abundantly upon the lake herring, 

 Argyrosomus artedi, in Lakes Huron and Superior and in rivers nmning into them. 



Salmincola beani (Wilson). 



LerncEOpoda beani Wilson, Proc. U. S. Nat. Mus., vol. 35, p. 470, pi. 81. 

 Salmincola beani Wilson, idem, vol. 47, p. 615, pi. 32, fig. 52, 53. 



Host and record of specimens. — Found ia considerable numbers on the gills of the quionat salmon, 

 Oncorhynchus ischawytscha, in McCloud River, Cal., and at Battle Creek, Colo. 



