104 CEYLON PEARL OYSTER REPORT. 



branches of the excretory vesicle, but filling the whole space between these branches 

 and behind the testes in numerous loops very densely pressed together. Eggs very 

 dark, almost black. 



At first view the arrangement of the genital organs of specimens somewhat 

 compressed exhibits a superficial resemblance with Dicroccelium, but closer examination 

 exhibits no intimate affinity between this and the new genus. 



Gastris censors, n. sp. Plate II., figs. 13-16. 



Specific diagnosis. Length up to 16 millims. ; just behind the ventral sucker 

 1*5 millims. to 1*7 millims. broad; greatest breadth about midway between the 

 ventral sucker and the posterior end of the body up to 5|- millims. 



Oral sucker circular, with a diameter of I'O millim. to 1*1 millims. Ventral sucker 

 oval, with a greater diameter transverse to the long axis of the body of 2*6 millims. 

 to 2*8 millims., and a smaller diameter parallel to the long axis of the body of 

 2'0 millims. to 2*2 millims. The opening of the ventral sucker is a transverse slit. 

 Distance between the two suckers 1'6 millims. 



Pharynx 0*6 millim. long, 0'84 millim. broad. Intestinal coeca end 1'8 millims. in 

 front of the posterior end of the body, in several specimens filled with a dark matter. 



Cirrus-pouch about 0'8 millim. long, about 0*5 millim. broad. Testes in about the 

 middle of the body ; vitellarium beginning at the level just behind the testes 

 and not reaching the level of the blind ends of the intestinal coeca. 



From Tetrodon stellatus, GUNTHER. Four specimens along with Schistorchis 

 cameus, found apparently also on South Modragam Paar and also in the stomach 

 of the host. 



Anaporrhutum largum, n. sp. Plate II., fig. 17. 



From the body cavity of Rhinoptera javanica ; Kalpitiya. A single specimen. 



Body very flat, membranous, smooth, oval, 9 millims. long, 8 millims. broad ; 

 the greatest breadth just behind the ventral sucker. 



Oral sucker subtermiual, oval, with a longitudinal diameter of 0'65 millim. and a 

 transverse diameter of 0'8 millim. Ventral sucker very large, but little excavated, 

 slightly oval, with a longitudinal diameter of 2 millims., and a transverse diameter 

 of 2 '2 millims. Distance of the two suckers from each other 1*5 millims. Distance 

 of the posterior margin of the ventral sucker from the posterior end of the body 

 4*8 millims. 



Pharynx 0*42 millim. long and 0'48 millim. broad, not projecting into the oral 

 sucker (as it does in A. albidum, OFENH.). (Esophagus short, about 0'6 millim. long. 

 Intestinal coeca large and long, end about 1 millim. in front of the posterior end of 

 the body, embracing a space smaller than that between their outer edge and the lateral 

 margins of body. This broadening of the parts outside the intestinal coeca, together 

 with the excessive diameter of the ventral sucker and the extreme thinness of the 



