NO. 2063. NORTH AMERICAN PARASITIC COPEPODS— WILSON. 611 



head to form a thick collar or ridge. Bulla mushroom-shaped, one- 

 third as long and nearly twice the diameter of the maxillae, with a 

 conical pedicel. None of these specimens showed the bilateral char- 

 acter spoken of by Wright (1882, p. 248). Maxillipeds three-jointed, 

 the two basal joints considerably swollen, the terminal joints tapering 

 strongly, the claw minute and curved. 



Color (preserved material) a uniform grayish-white. 



Total length (without egg strmgs), 4.35 mm. Length of trunk, 

 2.5 mm.; of arms and bulla, 2.85 mm.; of egg strings, 2.5 to 4.5 mm. 



{edwardsii, to Milne Edwards) . 



Specific characters of male. — Since this is the only male known in 

 the genus the specific characters are the same as the generic (p. 603). 



Remarlcs. — This species was first described by Mayor in 1824 under 

 the name Lernaeoiwda salmonea, because he believed it to be the 

 same as the species which Gissler, Lmnaeus, and Blamville had pub- 

 lished under that name. Milne Edwards in 1840 assigned Mayor's 

 species to the genus Basanistes, while he retamed Gissler's species in 

 the genus Lernaeopoda. In 1869 Olsson changed the species back 

 again to the genus Lernaeopoda, but confirmed Milne Edwards's 

 opinion that it was not the same as the salmonea of Linnaeus. Ac- 

 cordingly, he proposed the new name edwardsii for it, and it has been 

 thus known ever since. From the descriptions and figures of these 

 various authors there seems to be no reasonable doubt that the 

 form found in Europe is identical with that on the American trout. 

 Attention is called especially to the form of the bulla, the hump 

 joining the bases of the arms, the second antennae, and the maxilli- 

 peds as the distinguishing characters of the species. 



SALMINCOLA OQUASSA, new species. 

 Plate 31, figs. 36 to 40. 



Host and record of specimens. — Five females with egg strings were 

 obtained from blue-back trout, Salvelinus oquassa, at Kangeley Lakes, 

 Mame, Nov. 27, 1884, by Prof. L. A. Lee, of Bowdom College. They 

 are numbered 39604, U.S.N.M. One of them has been selected to 

 serve as the type of the new species and is numbered 43578, U.S.N.M. 

 They were attached to the inside of the operculum of the trout. 



Specific characters of female. — Cephalo thorax narrow and much 

 longer than wide, forming with the trunk a crescent or semicircle. 



Trunk pear-shaped, strongly narrowed anteriorly but without a 

 definite neck; squarely truncated posteriorly. Egg strmgs consider- 

 ably shorter than the trunk and rather plump, slightly curved and 

 attached to the body not by their ends but on one side near the end, 

 so that they project both forward and backward eggs lai^e, ar- 

 ranged in 5 rows, about 10 in each row. 



