Helminth Fauna of the Dry Tortugas. 37 



moreover, the ovary, while lobed, had a tendency to be elongated and to 

 lie with its long axis inclined to the axis of the body. In some the testes 

 are relatively nearer the posterior end than they are in the one figured. 



Mounted specimens, with ova, vary from 0.77 to 1.61 mm. in length. 



Dimensions of specimen in balsam: Length 1.55; breadth 0.46; oral 

 sucker 0.15; pharynx 0.06; ventral sucker 0.27; ova 0.052 by 0.039; 

 length of neck 0.56. 



This species was found in the following hosts: 



Host, Hcemulon plumieri: 



1906, July 5, 6 fish, few distomes; July 13,2 fish, i distome; July 15, 

 I fish, I distome. 



1907, July 3, 16 fish, few distomes; July 12, 12 fish, few distomes. 



1908, July 9, 3 fish, 3 distomes. 



Host, Hcemulon sciurus: 1908, July 5, 6 fish, few distomes. 



Dimensions, life, flattened: Length 1.37; breadth 0.63; oral sucker 

 0.17; pharynx 0.06; ventral sucker 0.32; ova 0.051 by 0.034. 



Dimensions, life, of a specimen from H. plumieri: Length 1.90; 

 breadth 0.70; oral sucker 0.22; pharynx 0.08; ventral sucker 0.36; ova 

 0.051 by 0.034. 



Hamacreadium oscitans gen. et sp. nov. (Figs. 61-633.) 



Body oval, usually broadest a short distance back of ventral sucker 

 and tapering scarcely at all at the posterior end; neck bluntly conical, 

 about equal to one-third the entire length. In some the greatest thick- 

 ness is at the ventral sucker. The ventral sucker is rather more than 

 1.5 times the diameter of the oral sucker; pharynx close to oral sucker; 

 esophagus about as long as the pharynx; intestinal rami extend to the 

 posterior end. Genital aperture median at the bifurcation of the intes- 

 tine; cirrus short, the small prostate and seminal vesicle inclosed in the 

 cirrus-pouch which lies in front of the ventral sucker, its basal end over- 

 lapping the ventral sucker a very little. The testes are 2, close together, 

 diagonally placed, about half-way between the ventral sucker and the 

 posterior end, not lobed. The ovary is about 4-lobed and is on the right 

 side at the anterior border of the right testis. The seminal receptacle is 

 on the dorsal side of the ovary. The vitelline glands are diffuse, densely 

 packed behind the testes, marginal to the posterior edge of the ventral 

 sucker. The uterus is between the ventral sucker and the testes and 

 ovary; ova with small tubercle at one pole. The metraterm lies on the 

 left side of the cirrus-pouch. The excretory vessels were not seen. 



This species was found in the following hosts: 



Host, HcBmiilon plumieri: 



1907, July 4, 8 fish, I distome; July 5, 12 fish, i distome. 



1908, July 6, 5 fish, I distome; July 10, 12 fish, few distomes. 

 Dimensions, balsam: Length 1.37; breadth 0.48; neck 0.43; oral 



sucker 0.15; pharynx 0.07; ventral sucker 0.43; ova 0.044 by 0.031. 



Host, Hcemulon sciurus: 



1907, July 5, 6 fish, few distomes. 



Dimensions, balsam: Length 1.40; breadth 0.70; neck 0.33; oral 

 sucker 0.16; pharynx 0.07; ventral sucker 0.31 ; ova 0.046 by 0.027. 



