20 PROCEEDINGS OF THE NATIONAL MUSEUM vol. 88 



Host. — Southern porgy {Stenotomus chrysops). 



Record of collections. — Two (U.S.N.M. No. 816'3), collected August 

 24, 1910, from gills of host; 6 fishes examined. Two, collected 

 August 27, 1910, from gills; 3 fishes examined. Three, collected 

 August 29, 1910, from gills; 16 fishes examined. One, collected Au- 

 gust 30, 1910, from gills; 3 fishes examined. 



Measurements in balsam: Length of body proper, 2.94 mm., of 

 sucker-bearing portion, 0.98 mm. ; breadth, at anterior end, 0.17 mm., 

 middle, 0.45 mm.; anterior sucker, length, 0.09 mm., breadth, 0.06 

 mm.; posterior sucker, 0.036 by 0.045 mm.; pharynx, length, 0.036 

 mm., breadth, 0.03 ram. ; egg, exclusive of filaments, 0.21 by 0.56 mm. 

 Number of testes 12; number of posterior suckers about 48. 



MICROCOTYLE FURCATA, new species 



Plate 16, Figure 220 ; Plate 17, Figuees 221-223 



Body lanceolate, tapering to a blunt point at anterior end ; sucker- 

 bearing portion approximately half the length of the body proper, 

 and bearing from 20 to 28 suckers on each side ; pharynx nearly cir- 

 cular in outline; esophagus short. The intestines were hidden in 

 large part by the vitellaria. So far as could be seen the main intes- 

 tinal branches do not extend posterior to the vitellaria. The genital 

 atrium is spacious and armed with numerous short, somewhat coni- 

 cal spines, the greater number of them about 0.006 mm. in length, 

 but a few at the posterior border of the atrium are about 0.009 mm. 

 in length. Ovary, as noted in other species of the genus, of two 

 distinct portions: (1) The ovary proper, consisting of small, closely 

 packed cells, on the right side of the median line at the anterior 

 edges of the first testes ; broader than long, and in some cases slightly 

 lobed. Its inner end is about on the median line, whence it extends 

 to the inner border of the right vitellaria. (2) An elongated and 

 more or less convoluted portion, containing large nucleated germ 

 cells. It is somewhat variable, but in general it may be described as 

 a tubular, greatly enlarged germ duct (pi. 17, fig. 222). It leaves 

 the anterior dorsal side of the ovary proper, passes forward dorsal 

 to the shell gland near the median line, turns, and crosses the median 

 line. It may then turn and run back for a short distance, turn 

 again, and return on itself, and run parallel to its former course, 

 thus forming a more or less horseshoe-shaped structure, with the 

 closed end pointing forward. It ends in front of the ovary proper 

 where it narrows to form the germ duct, which is joined, first, by 

 the short duct from the seminal receptacle, which lies near the ante- 

 rior border of the ovary proper, and then a little farther by the 

 vitelline duct. It then enters the region of the shell gland, from 



