Opalina. 209 
Number containing Opalinae 
Number 
examined 
Bombinator pachypus |105) O. caudata 61 
| O. intestinalis 34 
Both O. caudata and O. intestinalis 1°) 
Uncertain, either O. caudata or O. m- 
testinalis 
No Opalinae 8 *) 
Bombinator igneus 63 | O. caudata 25 
O. intestinalis 15 
No Opatinae 23 *) 
Hyla arborea 49 | O. obtrigona 21 
No Opalinae 28 
Rana esculenta 77 O. dimidiata 59 
QO. zelleri and O. dimidiata 2 
No Opalinae 16 
Rana temporaria 15) O. ranarum 10 
No Opalinae 5 (One had been starved 
a long time) 
Bufo variabilis 4) 0. ranarum 1 
O. caudata 1 
No Opalinae 2 
Bufo vulgaris 1 No Opalinae 1 
1) This frog was sick, the stomach being greatly distended by a very acid 
fluid, and the whole intestine being full of gas. The Opalinae in the rectum 
were shrunken, twisted and distorted, and in consequence the identification of the 
two species of parasites is not reliable. ZeLLER does not say whither he found 
these two species of parasites in the same individual host, though he describes 
them both from Bombinator igneus. 
2) Two of these were unusually large individuals, obtained in Berlin in the 
spring of 1908. In one the spots on the ventral surface were of the orange color 
typical of B. igneus. In the other the color was paler orange, more nearly 
approaching the lemon yellow characteristic of B. pachypus. The size and the 
character of the dorsal surface showed that these animals belonged to the species 
B. pachypus. 
8) Some of these Bombinator had been kept several months in the laboratory 
and were very thin. 
