18 -NOTICE OF 
THE OCCURRENCE OF 
SPERMS) ON CYPRINOID 
PROTOZOAN PARASITES (PSORO- 
FISHES IN OHIO. 
BY EDWIN LINTON. 
(With PI. cxx.) 
Three small Oyprinoids, Wotropis megalops^* PI. cxx, Fig. 1, each with several 
more or less spherical cysts on the exterior of the body, were submitted to me for 
examination in September, 1890, by the U. S. Fish Commission. The fish were taken 
in Black Eiver, Lorain County, Ohio, by Mr. L. M. McCormick, of Oberlin College, Ohio, 
September 1, 1890. In a letter accompanying the specimens, and dated September 
10, 1890, the following data are given : 
The fish were taken about 6 miles from the lake (Erie) just above an old mill-dam. The water 
was very shallow and quite warm, the bottom gravelly with a thin layer of mud. Besides the Cypri- 
noids there were taken in che same locality Noturus mhinis, Catostonms teres, and Moxostoma macrolepido- 
iuni, and in the rapid water, just below the dam, Ictaluriis and Boccus, The Oyprinoids appear to be 
the only fish affected by this parasite. 
The parasitized fishes are 47, 56, and 57 millimetres in length respectively, exclu- 
sive of the tail fin. 
No. 1 has two small globular masses 24 millimetres in diameter on the nose in front 
of the nasal pores, one on the under side of the head below the right eye, one at the 
base of the dorsal fin on the right side, and one at the base of the caudal fin on the left 
side near the ventral edge of the fin. These are all about the same size, and have the 
appearance of small globular cysts lying beneath the cuticle. Their color is white, with 
minute patches of black pigment belonging to the skin of the host. 
In No. 2 there is a botryoidal cluster made up of about six subspherical cysts at the 
base of the tail fin on the left side and extending from the dorsal to the ventral edge 
of the fin. This mass is about 7 millimetres long and 3 millimetres wide. The shorter 
diameter is in the direction of the anteroposterior axis of the host. On the right side 
there is another mass similarly situated, and composed of five cysts and a sixth placed a 
little below the others. The component cysts are from 2 to 3 millimetres in diameter. 
A view of the right side of No. 3 is given in PI. oxx, Fig. 1. This is the most 
seriously parasitized fish of the lot. There are the following cysts and clusters of cysts : 
A cyst on the tip of the nose, a cluster of three cysts on the under side of the head 
am indebted to Dr. D. S. Jordan for the identification of this minnow. 
359 
