THE OPALINID CILIATE INFUSOBIANS. 391 



ANURA. 

 Family PIPIDAE. 

 Subfamily Pipinae. 



Pipa pipa (Linnaeus), 3 specimens, United States National Museum No. 57571, 

 135 mm. long; female, British Guiana, 57572, 135 mm. long; male, same 

 locality, Julius Hurter, Sr., and 392S8, 135 mm. long ; female with eggs 5 mm. 

 in diameter, T. Barbour; all uninfected. 



Nine specimens from the American Museum of Natural History, all from 



British Guiana, no Ciliata. 



Subfamily Xenopodinae [Dactylethrinae.] 



Xenopus calcaratus Buchholz and Peters, 20 specimens, American Museum of 

 Natural History (all collected by the American Museum Congo Expedition), 

 as follows : 



* No. 9753. 42 mm. long ; female with eggs ; Niapu, Belgian Congo ; Janu- 

 ary, 1914 ; a very few Protoopalina xenopodos. 



* No. 9705, 43 mm. long; female with about half the usual number of eggs; 

 same label ; many Protoopalina xenopodos. 



Nos. 9705, 9707, 44 and 33 mm. long ; same label ; many elongated, slender 



Nyciotherus; no Opalinids. 

 No. 9648, 37 mm. long; same label; Balantidium; no Opalinids. 

 No. 9697, 43 mm. long ; same label ; no Ciliates. 



* No. 9791, 43 mm. long ; female with eggs mostly laid, Avakubi, Belgian 

 Congo ; January, 1914 ; elongated Nyctoiherns, also numerous Protoopal- 

 ina xenopodos. 



* No. 9803, 28 mm long ; same label ; rather numerous Protoopalina xeno- 

 podos. 



* No. 9806, 36 mm. long ; same label ; apparently a few Protoopalina xeno- 



podos, but too poorly preserved for certainty (formalin?). 

 No. 9792, (36 mm. long), 9797 (30 mm. long), 9799 (44 mm. long), 9804 



(31 mm. long) ; same label; elongated Nyctotherus; no Opalinids. 

 No. 9796, 26 mm. long ; same label ; poorly preserved, nothing found. 

 No. 9807, 38 mm. long ; female with eggs ; same label ; small Trematodes ; 



no Opalinids. 



* No. 9750, 43 mm. long ; female with eggs, Medje, Belgian Cougo ; June 

 6, 1910 ; some small, elongated Nyctotherus, numerous Protoopalina 

 xenopodos. 



No. 9751, 43 mm. long ; female with eggs ; same label ; many elongated 



Nyctotherus; no Opalinids. 

 No. 9650, 37 nun. long; Niapu, Belgian Congo; January, 1910; elongated 



Nyctotherus ; no Opalinids. 

 No. 9762, 41 miu. long; female with eggs; Medje, Belgian Congo; June, 



1914 ; elongated Nyctotherus, no Opalinids. 

 No. 9812, 40 mm. long; Avakubi, Belgian Congo; February, 1914; very 

 stiff from strong alcohol; no Ciliata found. 

 Xenopus laevis (Daudin), 22 specimens, United States National Museum. Nos. 

 40690 (48 mm. long), 40716, 40717, 40720, 40722 to 40725, 40960 (90 mm. 

 long), 40908 (52 mm. long), 40910, 40912 (46 mm. long), 41296 (33 mm. 

 long) 41680, 41681, 41683, 41684, 41712 (85 mm. long, female with immature 

 eggs), 41713 (3 specimens, tadpoles from the pouch of a Rosy Pelican, iden- 

 tification uncertain) ; all from British East Africa; no Opalinids. 



