430 BULLETIN 120, UNITED STATES NATIONAL MUSEUM. 



Family LEPTODACTYLIDAE. 



Limnodynastcs dorsalis: ZeUerieUa hinuclcata, Profoopalma " intestinalis" P. 



dorsalis, and P. acuta. 

 Telniatohins jclskii: ZeUerieUa tclmatohii and ProtoopaUna lonyinucleata. 

 Upcrotcia marmorata: ProtoopaUna tenuis and P. " intestinaUs " (llaff, 1911). 



Family GASTROPHRYNIDAE. 



Atelopus varius: ZelerieUa [atelopodos] and Z. ateJopyxena. 



Rhinodcrma darwinii: ZeUerieUa darioinii and ProtoopaUna rhinodermatos. 



Family RANIDAE. 



Polypcdatcs Icucomy.'itax: Cepedea scrimentata and, probably fi-om this species, 



Dobell's OpaUna virgula. 

 Rana draytonii: ZeUerieUa ranaxena and OpaUna draytonii. 

 R. esctilenta: Cepedea diniidiata and its form zelleri, ProtoopaUna intestinalis 



and OpaUna ranarum. 

 R. Umnocharis: Cepedea tonga, OpaUna lata and O. japoniea. 

 R. nipromaculota: ProtoopaUna axonuclcata lata, and Cepedea ditnidiata orien- 



ta.Us. 

 R. nutti: ProtoopaUna primordialis and P. nutti. 

 R. pipiens: Cepedea mexieana and OpaUna oMrigonoidea. 

 R. tcmporaria: OpaUna ranarum and its forms arvalis and cinctoidea, and 



Cepedea dimidiata. 

 R. tcmporaria parvipalmata: OpaUna ranarum and its form parvipalmatae. 

 R. tigcrina: Cepedea ophis and ProtoopaUna fiUformis. 



Third. — Upon the question of the simultaneous infection of a single 

 individual host by two or more species of Opalinids there is less data. 

 Double or multiple infections by Opalinidae are not known from 

 fishes or Urodela, from Dendrohatinae., or Raninue. Among 

 the Discoglossidae, in Bonibina fachypa., I found a single infection 

 of distorted Protoopalinas in an individual with badly inflamed 

 alimentary canal, in which there appeared to be both P. caudata 

 and P. infestinalis, but the identification of these distorted para- 

 sites was very doubtful. Among the Pelobatidae, in an individual of 

 tScaphiojJus solitarius, was found ZeUerieUa scaphiopodos and 

 OpaUna oblanceolata. Among the Hylidae a Hyla haudinii gave 

 Cepedea handinii and OpaUna guatemalae^ and a H. septentrionaUs 

 yielded a ZeUerieUa of doubtful species and an unidentified OpaUna. 

 There was no doubt in this case, though the species of the Opalinids 

 were not determined. Among the Bufonidae we have six cases of 

 individuals simultaneously infected by two species of Opalinidae, as 

 follows : Bufo cognatus bearing ZeUerieUa Mrsuta and OpaUna dls- 

 Gophrya; B. haemaUticus bearing Cepedea doUchosoma and an un- 

 determined species of OpaUna; B. peUocephalus bearing Protoo- 

 paUna hufon/s and ZeUprleUa sp. ?: B. typhonius bearing ZeUerieUa 

 opisthocarya [of Bufo typhonius] and OpaUna panmnanensis ; B. 

 woodhousi bearing ZeUerieUa [of Bufo vwodhousi'] and OpaUna 



