610 PROCEEDINGS OF THE NATIONAL MUSEUM. tol. 47. 



numbered 39587, U.S.N.M. Three females were taken from brook 

 trout at Sleepy Creek, Houghton, Michigan, Aug. 30, 1905, by 

 T. T, Hankinaiy, and are numbered 43577, U.S.N.M. There are two 

 females probably belonging to this species, which are labeled "Lake 

 Superior. U. S. Lake Survey. S. I. Smith, 1871," but the speci- 

 mens are so shriveled in the alcohol as to make the identification 

 uncertain. 



Smith also described as a new species (Lernaeopoda fontinalis) 

 specimens found upon brook trout at Norway, Maine, in A. B. 

 Crockett's hatchery, which are undoubtedly the same as the present 

 species. 



Gurley in his manuscript reports a number of specimens from brook 

 trout in the ponds of the U. S. Fish Commission Station, Northville, 

 Michigan, which he collected April 26, 1894, durmg a severe epidemic 

 which killed many of the fish. Specimens were also sent to the 

 United States National Museum May 16, 1911, from trout in a small 

 brook at South St. Paul, Minnesota, by Marshall E. Humphrey, of the 

 Kinnickinic Fisherman's Association. These were identified by the 

 present author and returned to Mr. Humphrey. 



Specijic cliaracters of female. — Cephalothorax inclined at an angle 

 of about 45° to the trunk axis, elongate-triangulate, broadest across 

 the posterior margin, narrowing to a rounded point anteriorly, two- 

 thirds as long as the trunk, and separated from it by a well-defined 

 groove and by the ridge formed by the bases of the second maxillae. 

 Trunk pear-shaped, narrowed anteriorly where it joins the cephalo- 

 thorax, but without a definite neck; flattened on the ventral surface, 

 strongly convex dorsally; no anal lammae or posterior processes, but 

 in all the younger and in some of the adult specimens there is a small 

 genital process. Egg strings short and stout, rarely longer than the 

 trunk; eggs of good size, arranged in 4 or 5 longitudinal rows, from 

 12 to 15 eggs in each row. First antennae short, nearly the same 

 diameter throughout, tipped with two or three minute spines and 

 showing no traces of segmentation. Second antennae biramose, the 

 exopod rounded and unsegmented, covered on the outer, and a part 

 of the terminal, margm with short spines curved inward ; the endopod 

 two-jomted, the basal joint swollen on its ventral and lateral margins 

 into a rounded knob covered with short curved spines, the terminal 

 joint much narrower than the basal, palp-like, and terminatmg in two 

 fleshy points. Mandibles relatively short and stout, the distal third 

 armed with 5 or 6 curved teeth without any secondary teeth. First 

 maxillae short and rather stout, terminating in one (Wright) or two 

 curved spines, the palp flask-shaped, shorter than the maxilla, and 

 terminating in one or two (Wright) curved spines. Second maxillae 

 (excluding the bulla) about the same length as the fused trunk, the 

 same diameter throughout, and extending around the back of the 



