BY S. J. JOHNSTON. 319 



the cirrus-sac and the testes presents the appearance, in whole 

 mounts, of being stuffed full of eggs, which are themselves 

 comparatively small. 



Brachysaccus symmetru s,* sp.n. 



(Figure 10). 



Diaynosts. — Somewhat Utncet-sha'ptd worms, moderately 

 stout, about 147 mm. long, by 0-57 mm. broad. Integument 

 spiny, the spines disappearing towards the posterior end. Oral 

 sucker (0-256 mm.) larger than the ventral (0-215 mm.) ; ratiu 

 of oral to ventral, 6:5. Alimentary canal and excretory 

 vesicle as in the genus ; but the intestinal limbs do not extend 

 so far back as in B. anartius. Testes oval, 0147 x 0-105 mm., 

 lying very close to one another, and obliqutly one behind the 

 other in the posterior end of the body. Ovary oval, about 

 same size as the testes (0-147 x 0101 mm.), long diameter 

 transversely placed, at about the middle of the body-length. 

 Yolk-glands arranged in a pair of anterior and a pair of pos- 

 terior masses. The anterior masses do not extend inwards 

 beyond the intestinal limbs ; but the posterior masses stretch 

 under the whole surface, from the level of the testes back- 

 wards. Loops of the uterus as in B. anartius. Eggs, 0-034 x 

 0019 mm. 



In the rectum of Hyla cierulea. 



Type-specimen in the Australian Museum, No. "VV.338. 



This species, I have met with only twice; three individuals 

 were obtained from the rectums of two specimens of Hyla 

 carulea, one in one rectum and two in the other. Two of the 

 specimens were mounted whole, and the other sectioned. This 

 species differs from B. anartius mainly in its much smaller 

 size, and in the relative sizes of the suckers, which are here 

 very distinctive, the oral sucker being smaller than the ven- 

 tral in B. anartius, but larger than it in B. symmetrus in 

 having the testes and ovary about the same size, and in the 



* iTVjXjXiTpo'i, referring to the yolk -glands. 



