160 PROCEEDINGS or THE NATIONAL MUSEUM vol. 88 



fins, but also under the skin and a few in the flesh. In all 95 cysts 

 were noted, of which 61 were on the fins, 32 under the skin, and 2 

 in the flesh. Measurements of larva in glycerin : Length, 0.30 mm. ; 

 breadth, 0.15 mm. ; oral sucker, length, 0.060 mm., breadth, 0.039 mm. ; 

 ventral sucker, not distinct, length about 0.042, breadth about 

 0.024 mm. 



Pieces of the skin and fins of small-mouthed black bass, with many 

 pigmented cysts, were received on October 3, 1902. The fishes were 

 collected by the Eev. James H. Young at Troy, Ohio. A larva 

 removed from its cyst measured 0.4 mm. in length and 0.2 mm. in 

 breadth. 



Keceived on September 25, 1903, pieces of skin with underlying 

 muscle tissue of small-mouthed black bass with cysts surrounded by 

 black pigment. The bass were taken from a fresh water pond near 

 Portland, Maine. It was stated that the yellow perch and sunfish 

 in the pond were similarly affected. Larvae removed from cysts 

 measured 0.4 mm. in length and 0.2 mm. in breadth. 



A small-mouthed black bass, taken on November 15, 1907, by James 

 L. Robertson from Culver Lake, Branchville, N. J., was sent to me 

 on account of the large number of cestodes in the body cavity. Pig- 

 mented cysts containing larval trematodes were found in the flesh. 



Three small-mouthed black bass (U.S.N.M. No. 8398) were received 

 on July 29, 1915, from Charles Meyers, Deputy Fish and Game War- 

 den, Far Hills, N. J. The fishes had been taken in Ravine Lake, 

 Somerest Hills Country Club. Mr. Meyers stated that the bass in 

 the lake were heavily infested with these parasites, especially on 

 the fins and in the mouth. There were numerous cysts with black 

 pigment on these fishes; most abundant on the caudal and pectoral 

 fins, on the cheeks and opercular region, also on inner side of 

 opercle ; a few in the mouth, and scattering cysts on the scales of the 

 sides. Many cysts were found in the skin. They were not visible 

 from the outside, but upon removing the skin they were found to be 

 rather abundant along the sides. A piece of skin about 5 cm. square 

 had about 25 cysts on the inner side. Most of these cysts were in 

 the subdermal connective tissue, but one was noted just back of the 

 head at a depth of 8 mm.; a few were found among the neural 

 spines under the dorsal fin, as much as 20 mm. from the surface. 

 The largest cyst noted was 2.5 mm. in diameter; usual size about 

 1 mm. in diameter. Tlie pigmented area is much larger than the 

 cyst. Fifty-three cysts were counted on an 18 mm. square on a 

 pectoral fin, and 72 on a similar area on a caudal fin. Measurements 

 of a formalin specimen removed from its cyst: Length, 0.8 mm.; 

 breadth, neck, 0.28 mm., at level of ventral sucker, 0.26 mm. ; posterior 

 end to ventral sucker, 0.30 mm.; diameter of oral sucker, 0.07 mm., 



