4 PROCEEDINGS OF THE NATIONAL MUSEUM. vol.60. 



in the median line between the acetabulum and intestinal bifurcation. 

 The ovary is small, globular in shape, lying toward the right side 

 in front of the anterior testis. The uterus is short and contains only a 

 few eggs. Neither receptaculum seminis nor Laurer's canal were seen. 

 The shell gland is diffuse. The vitellaria extend from the level of 

 the middle of the acetabulum to the posterior extremitj'^ of the body. 

 Occasionally thej'^ are found as far forward as the level of the genital 

 sinus. In the posterior region of the bod}'^ behind the second testis 

 the vitellaria from both sides extend across the median line, while 

 in front of the post-testicular region they occur only laterally and 

 mostly on the external sides of the intestinal branches. The trans- 

 verse vitelline ducts unite in front of the anterior testis, forming a 

 transversely-elongated vitelline reservoir. The oval, thin-shelled 

 eggs are 0.097 to 0.10.5 mm. long and 0.065 to 0.074 mm. wide, light- 

 yellow in color, and provided with an operculum. 



The excretory system follows the general arrangement in Echi- 

 nostomes. A single stem leads from the terminal excretory pore an- 

 teriorly, giving off lateral branches and behind the posterior testis 

 dividing into two main branches, each passing between the testes and 

 the corresponding intestinal branch. 



Host. — Dog. 



Location. — Small intestine. 



Locality collected. — China. 



Type specimens. — United States National Museum Helminthologi- 

 cal Collections No. 18678, collected by Dr. R. T. Shields. 



PROHEMISTOMUM INDUSTRIUM, new species. 



Plates 2 and 3. 



This parasite represents the second species of the genus Prohemi- 

 stomum Odhner, 1913, to be reported from the dog, the first, P. ap- 

 pendiculatum, having been described by Ciurea (1916). The placing 

 of the new species in the genus is based on the general appearance of 

 the body and the arrangement of the internal structures, especially 

 the genital organs. It differs from P. appendiculatu?7i, as well as from 

 P. spinulosum Odhner, in the presence on its ventral surface, between 

 the folds of the body, of a well-developed clinging plug which re- 

 sembles that found in the genus Brnunina Heider, 1900. Like Brau- 

 nina cordiformis Wolfe, 1903, it probably maintains its position in- 

 side the intestine of its host by grasping the intestinal mucosa be- 

 tween the folds of the body and the clinging plug. 



Description. — Body more or less oval, somewhat pyriform in shape, 

 broad and round anteriorly, narrowing posteriorly. Stout spines 

 cover the entire surface of the body except the clinging plug and the 

 region posterior to the second testis. LfCngth, 1.5 to 1.9 mm. ; maxi- 

 mum width, 1.0 to 1.2 mm, and maximum thickness about 0.74 mm., 



