THE OPALINID CILIATE INFUSORIANS. 387 



xtentor and E. 'pustulosus ; ZeUeriella intei^nedia from Bufo inter- 

 medius and B. valliceps,' ZeUeriella Uptodactyli from Leptodactylus 

 alhildbris^ L. caliginosus^ L. gracilis, and L. microtis; ZeUeriella 

 paludicolae from Paludicola hihronii and P. hrachyops ; Cepedea 

 cantabrigenesis from Rana cantahrigensis and its subspecies latire- 

 mis; Cepedea dinudiata from Bufo hufo, Rana esculenta, R. tem- 

 poraria, and R. viridis; Opalina chorophili from Choropilus triserl- 

 atus, C. occidenfalis, C. ornatus and C. feriarinn; Opalina copei from 

 Rana copei and R. pretiosa; Opalina discophrya from Bufo cognatus 

 and B. copei; Opalina japonica from Rana japonica and probably the 

 same Opalina from R. limnocharis ; Opalina ohtrigona from Hyla 

 arhorea and its subspecies japonica and savignyi; Opalina ohtrigo- 

 noidea from Bufo fowleri, B. punctatus, Scaphiopus solitarius, Hyla 

 femoralis, H. arenicolor, H. pickenrigii, Gastrophryne carolinensis, 

 Rana pipiens, and R. palustHs; Opalina ohtrigonoidea lata from 

 Rana aurora and R. aesopus; Opalina ohtrigonoidea maxima from 

 Bufo horeas and B. Jialophilus ; Opalina ranarwm from Bonibina 

 homhina, Bufo vii'idis, B. hufo, Rana arvalis, R. dalmatiTUi, R. escu- 

 lenta, R. teviporaria and its subspecies parvipalmata, and from 

 Tritmnis alpestris (quite likely a transient infection due to this 

 species devouring tadpoles of Rana teniporaria) ; Opalina virguloidea 

 from Hyla eximia, H. regilla, Rana hoylei, and R. sylvatica. 



The great majority of the species of Opalinid are known from but 

 one species of host. Several species of Opalinid are known from two 

 or more species of a single genus of host. Six species of Opalinid are 

 reported from hosts belonging to different families of Anura. These 

 cases deserve scrutiny. 



Protoopalin/L caudata is reported from two species of Bonibina and 

 from a Bufo, but the report from Bufo is based upon but four speci- 

 mens of the host from a single locality and these infections may have 

 been but temporary, like the cross infections of European Anura with 

 unaccustomed species of Opalinid. which I easily obtained some dozen 

 years ago. This suggestion, however, does not seem probable in the 

 present instance. 



Protoopalina intestinalis is reported from two species of Bombina, 

 from Discoglossus, Pelobates, Rana, two species of Hyla, from Upero- 

 Uia^ and from the Urodele 2'Hturus [7'riton^. All of these reports 

 except from Bonibina are somewhat doubtful. The reports from 

 Discoglossus are old reports and may likely not be based upon the 

 most careful discrimination. This seems more probable since I have 

 found in Discoglossus pictus (the host in question) a Protoopalina 

 which I have classed as a subspecies of P. caudata, but which might 

 almost as well have been given specific rank. This form might 

 readily be mistaken for Protoopalina intestinalis if not closely ob- 



