184 PROCEEDINGS OF THE NATIONAL MUSEUM vol.84 



formalin, the fluid being drawn under the coverslip with filter paper. 

 Worms were allowed to "set" in a somewhat flattened condition before 

 being removed from the slide to a dish of formalin for preservation. 

 All specimens were stained with Bullard's hematoxylin, dehydrated 

 in alcohol, and cleared in cedar oil. 



The present paper deals exclusively with members of the trema- 

 tode genus Brachycoelium Dujardin, 1845. 



I wish to express my appreciation to Dr. Maurice C. Hall, form- 

 erly chief of the zoological division, U. S. Bureau of Animal In- 

 dustry, for the loan of paratype specimens of Brachycoelium meri- 

 dionalis Harwood and B. daviesi Harwood ; to Dr. Fred J. Holl, Uni- 

 versity of Buffalo, for the loan of slides carrying a serially sectioned 

 specimen of B. trituri Holl ; to Dr. M. C. Hall and Dr. E. W. Price, 

 TJ. S. Bureau of Animal Industry, for reading the manuscript; and 

 ±0 James F. Denton for assistance in the technical work involved. 



Genus BRACHYCOELIUM Dujardin, 1845 



The genus Bracliycoelium (as a subgenus of Distoma) was erected 

 by Dujardin (1845) for the reception of the species Brachycoelium 

 <irassicolle (Kudolphi) {^Distoma crassicolle Kudolphi, 1809). 

 Looss (1899) utilized the genus as the type around w^hich to estab- 

 lish his subfamily Brachycoeliinae. Later S. J. Johnston (1912) 

 elevated Looss' subfamily to the rank of family, Brachycoeliidae, 

 •which now includes the three w^ell-known genera Brachycoelium Du- 

 jardin, 1845, Glypthelmins Stafford, 1905, and Mesocoelium Odhner, 

 1911. Faust (1929) included the family Brachycoeliidae in his super- 

 family Dicrocoelioidea. 



The genus Brachycoelium is characterized as follows : Body elon- 

 gated, more or less cylindrical ; cuticle wuth or without ( ? ) spines ; 

 suckers subequal; acetabulum at about equator of body; intestinal 

 caeca short, diverging posterolaterally from bifurcation, ending 

 short of level of acetabulum; ovary anterior (posterior in B. lynchi) 

 to opposed testes, slightly smaller than male glands; genital pore 

 ventral, in midline immediately in front of acetabulum; uterus 

 sinuous, rather simple ; ova small, thick-shelled, operculated ; vitellaria 

 follicular, anterior to level of acetabulmn; excretory bladder Y- 

 shaped, with short cornua; parasitic in intestine of amphibians and 

 reptiles. 



Since the erection of the genus for the inclusion of B. crassicolle^ 

 seven other species have been added as follows: By Stafford (1900), 

 B. hospitale; by Nicoll (1914), B. ohesitm; by Holl (1928), B. tri- 

 turi; by Harwood (1932), B. storerlae, B. mendionalis^ and B. 

 daviesi; and by Ingles (1936), B. lynchi. This paper adds five new 

 species to the genus. 



