Helminth Fauna of the Dry Tortugas. 



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Average dimensions of ova, alcoholic: 0.03 by 0.02. 



Host, Lycodontis moringa: July 2, 1907, 1 fish, 4 distomes. 



Dimensions: Length of largest 5 mm., breadth 2.5 mm. Intestine in 

 one filled with dark-brown or black granular material. Suckers filled 

 with blood-cells of host. 



Host, Lycodontis funebris: 



1906, July 4, 1 fish, 4 distomes from swim-bladder; June 28, 2 fish, 

 4 distomes from swim-bladder. 



1908, July 7, 1 fish, 2 distomes from swim-bladder. 



The following remarks are condensed from notes made at the time 

 of collecting the material from L. funebris. 



In the first lot the genitalia were not well developed. One of the 

 specimens was 2.5 mm. in length, 1.75 in breadth, and 1.25 in thickness. 

 After it had been flattened and fixed over the flame it measured 5 mm. 

 in length and 2 in breadth. In the second lot two distomes were found 

 in the swim-bladder of each of the morays. The largest was 5 mm. in 

 length and 3 in breadth. Uterus voluminous, yellow; intestines dark 

 brown; other organs white or colorless. In the third lot the distomes 

 were variable, tense, body -wall thin. One of them burst open after 

 lying for a short time in sea-water. The other at times contracted into 

 a nearly spherical shape, and then changed to pyriform, short-clavate, 

 cylindrical, arcuate. The prevailing color white, uterus in voluminous 

 folds on dorsal side, golden-yellow, other genitalia ivory-white; intestine 

 dark brown; dark-brown, irregular lines showing through the body-wall 

 throughout the entire length appear to be excretory vessels. The unin- 

 jured specimen was killed in 70 per cent alcohol and straightened with 

 a brush. It then measured 10 mm. in length and 5 in breadth. 



Theletrum fustiforme gen. et sp. nov. (Fig. 137.) 



Etymology: Qyhj, nipple; ^~/">'-', the belly. 



The following description is based on a single specimen mounted in 

 balsam and seen in lateral view. 



Body cylindrical with rather thick walls, enlarging slightly to pos- 

 terior end; smooth, but somewhat corrugate with transverse striae and 

 with a cluster of low but distinct rounded papilla? on the ventral surface 

 behind the ventral sucker and occupying a little less than the middle third 

 of the length; neck equal to about one-fourth the length. Oral sucker 

 sub terminal, approximately half the diameter of the ventral sucker; 

 pharynx subglobular, contiguous with the oral sucker; esophagus two 

 or more times as long as the pharynx. The intestinal rami are slender, 

 slightly sinuate, and extend to the posterior end. Genital aperture 



