150 PROCEEDINGS OF THE NATIONAL MUSEUM vol. 88 



first testis vras about 1.6 mm. from the anterior end. The tubular 

 ovary began near the testes and continued in the germ duct which 

 ended at the shell gland, about 15 mm. from the anterior end. The 

 tubular vitelline gland extended from the shell gland to the posterior 

 end. The uterus, lying mainly in two longitudinal folds, fills the 

 body in most cases from near the oral sucker to the posterior end. 

 The uterus and ejaculatory duct appeared to open at the posterior 

 margin of the oral sucker in one; "while in another the uterus can 

 be traced to the right anterior ventral margin of the oral sucker, 

 thence it appears to cross over to the left anterior border. In an- 

 other the uterus opens at the ventral edge of the oral sucker a little 

 to the left of the median line. In another the uterus opens on the 

 median line at the anterior ventral border of the oral sucker. "\^^iere 

 best shown the opening of the uterus is slightly prominent, as a very 

 low rounded papilla at the ventral border of the oral sucker. 



There is much variation in the testes. In general the right testis 

 is considerably in advance of the other. Thus, in one the left testis 

 is much smaller than the right, and its anterior end is about on a 

 level with the posterior end of the right testis. Each is elongated 

 and more or less convolute-lobed. In another the relative positions 

 are about the same but the second, or left, testis is larger than the 

 first. In another the testes are nearly opposite, as figured by Odlmer. 

 In another they are opposite and very much reduced in size. In this 

 specimen the uterus exhibits regional inflations as in Odhner's figure 

 (1. c.,fig. 8). 



DIDYMOZOON SAKDAE (G. A. and W. G. MacCallnm) 



Plate 23, FiGtmE 310 



Koellikeria sardae G. A. and W. G. MacCaulum, Zool. Jahrb., vol. 39, pp. 161-166, 

 figs. 11-16, 1916. 



Following is a record of collections of this trematode which were 

 made by Mr. Edwards and myself. So far as details of the anatomy 

 are shown in mounted material they agree with the description of the 

 species given by the MacCallums. In one of the specimens mounted 

 in balsam the intestine is seen to divide at about the middle of the 

 length of the testes, or 2.8 mm. from the anterior end. The esoph- 

 agus is conspicuous, being surrounded by a thick wall of cells, while 

 the walls of the intestine are exceedingly thin. 



Host. — Bonito {Sarda sarda). 



Record of collections. — Four, collected July 7, 1903, by Vinal N. 

 Edwards, from gills of one fish. 



Measurements in formalin : Largest cyst, length, 12 mm., breadth, 

 3.5 mm. ; smallest cyst, length, 7 mm . ; breadth, 4.5 mm. Two worms 

 from largest cyst measured 31 and 37 mm. in length, respectively; 



