ABT. 1 TREMATODE PARASITES OF BIRDS LINTON 7 



at about the level of the anterior border of the ventral sucker and 

 extend to the posterior end of the body. The genital pore is at the 

 anterior border of the ventral sucker a little to the left of the median 

 line. Testes two, contiguous, diagonally placed, about half way 

 between the center of the ventral sucker and the posterior end ; cirrus- 

 pouch and seminal vesicle dorsal to the anterior border of the ventral 

 sucker. Ovary subglobular, at right anterior border of testes ; uterus 

 in front of ovary and testes, the ova relatively few and lying mainly 

 between the testes and the ventral sucker, but a few usually in the 

 metraterm dorsal to the ventral sucker, about 0.084 by 0.054 in the 

 two principal diameters. The vitellaria are diffuse and extend from 

 the level of the genital pore nearly to the posterior end. Excretory 

 vessel behind the testes spacious 



From a series of transverse sections the following interpretations 

 were made : In one section near the posterior edge of the ventral 

 sucker, the opening of Laurer's canal was seen on the dorsal side of 

 the section. In the next two sections the canal is seen passing ventrad 

 along the right side of the first testis. It then turns to the dorsal 

 side of the testis, and, proceeding dorso-sinistrad, enters the shell- 

 gland, which lies for the most part on the left side of the ovary. In 

 the fourth section the germ duct and the vitelline duct from the trans- 

 verse vitelline reservoir, which lies along the dorsal side of the testis, 

 between it and the postero-ventral border of the ovary, were seen 

 entering the shell-gland. In the first of these four sections an ovum 

 was observed in the oviduct still within the shell-gland. 



The neck in all the preserved material is strongly flexed ventrad, 

 and measurements are consequently rather difficult to make. 



Following are dimensions of a specimen in balsam : Length 1.96 

 mm.; maximum breadth (at ventral sucker) 0.63; breadth of head, 

 excluding spines, 0.28, of neck 0.21 ; oral sucker, length 0.105, breadth 

 0.063; ventral sucker, length 0.31, breadth 0.34; pharynx, length 

 0.096, breadth 0.051; ova 0.09 by 0.05. The ventral sucker is 0.7 

 mm. from the anterior end and the testes 0.5 from the posterior 

 end. In another specimen the oral spines had the following dimen- 

 sions: Spines at ventral angles of the head, length 0.144 to 0.150, 

 breadth 0.024; lateral spines, length 0.105 to 0.120, breadth 0.018. 



Type md faratype.—C?ii. No. 7920, U.S.N.M. 



BECOBD OF COLI.ECTIONS 



€olynibus auritus. 



1905, December 25. 60. Uniformly short and plump. Dimensions 



in formalin: Length 1.47; breadth, anterior 

 0.33, middle 0.56, posterior 0.16 ; diameter of 

 oral sucker 0.09, of pharynx 0.05, of ventral 

 sucker 0.30; ova 0.088 by 0.054. 



