CONTRIBUTIONS FROM THE BERMUDA BIOLOGICAL STATION 



FOR RESEARCH. NO. 135. 



THE PARASITIC \YORMS OF THE ANIMALS OF BERISIUDA. 



I. TREMATODES. 

 Franklin D. Barker. 



Received Feb. 12, 1922. Presented by E. L. Mark, March 8, 1922. 



Introduction. 



Through the courtesy and generous assistance of Professor E. L. 

 Mark, Director of the Bermuda Biological Station, and of the National 

 Academy of Science, it has been my pri\dlege to spend two seasons at 

 the Bermuda Station, collecting and studying the parasitic fauna. 

 The following paper is the first of a series which will embody the results 

 of these investigations. 



The two forms here described were found in the stomach of a Hawk's- 

 bill Turtle, ChcJonia imbricata (Linn.), at the Bermuda Biological 

 Station. 



Pachypsolus brachus, n. sp. 

 (Pis. I and II, Figs. 1-8, 12). 



1 . Morphology. 



General Appearance. — The description of the following species is 

 based on the study of 27 preserved specimens, 1 1 of which were killed 

 and fixed in 2% formol and 16 in vom Rath's osmio-sublimate mixture. 

 Little difference can be seen as a result of the different killing reagents 

 other than in color. Specimens fixed in formol are grayish-yellow, 

 those fixed in vom Rath's fluid black. A detailed study has been made 

 of specimens in toto, both unmounted and mounted, and of series of 

 frontal and sagittal sections. 



The body is oval and plump (PI. II, Fig. 8), being one half as thick 

 as wide. The length varies from 3jnm. to 3.7 mm., the mode being 

 3 mm., which is the length of 50 per cent of the individuals. The 

 width varies from 1.5 to 1.9 mm., the mode being 1.7 mm., which is 

 the width attained by 60 per cent. The ends are bluntly rounded, 



