Opalina. 207 
Occurrence of the species of Opalina. 
We now know thirteen species of Opalina, twelve parasitic in 
tailless Batrachia (one of these also in Triton) and one in a Me- 
diterranean fish, Box boops.. Their occurrence is as follows (cf. Text- 
fig. II): 
Species with two nuclei, bodies circular in cross section. 
O. saturnalis, Luger & Dusosca, in Box boops, Laur.* 1) 
O. intestinalis, Srrin (Buocn?) ,, Bombinator pachypus, Bon.* 
Bombinator igneus, Laur. ®) 
Discoglossus pictus, Orrn, *) 
Pelobates fuscus, WaAGu. 
Rana esculenta, L. *) 
Triton taeniatus, Scun. *) 
O. caudata, ZELLER » Bombinator pachypus, Bon.* 
Bombinator igneus, Laur.* *) 
Bufo variabilis, Paw. *) 
O. macronucleata, BEzzEnB. , Bufo melanostichus, Scan. *) 
Species with four to five nuclei, body circular in cross section. 
O. lanceolata, BEzzENB. in ana esculenta, L., var. chinensis, Oss. °) 
Species with many nuclei, body circular or broadly oval 
in cross section. 
‘ 
O. dimidiata, SvErN in ana esculenta, .* °) 
Bufo vulgwis, Laur (cinereus, L.). 
Bufo variabilis, Pau. 
O. zelleri, NERESHEIMER ,, Lana esculenta,* °) 
O. longa, BEzzuns. » Lana limnocharis, Wicm.°) 
Species with many nuclei, body flattened. 
O. flava, StOKES in Scaphiopus holbrookii, Harwan. *) 
O. lata, BEzZENB. » Lana limnocharis, Wicm.°) 
O. ranarum, Eure. » tana temporaria, L.* (fusca RosEt). 
Bufo vulgaris, Laur. 
Bufo variabilis, Pawu.* 
