40 



BULLETIN 120, UNITED STATES NATIONAL MUSEUM. 



About 8 per cent of the individuals in the infections studied have 

 each of the two nuclei in active division, preparatory to division of 

 the body. Some of these nuclei are in an anaphase of mitosis, and 

 these show apparently 8 or possibly 10 massive chromosomes (fig. 

 16, g). The material is neither sufficient nor sufficiently well pre- 

 served to permit entire confidence in the counts. The two anaphase 

 nuclei are slenderly elliptical, or even slightly dumbbell-shaped, and 

 may or may not still be connected by a thread. The proportion of all 

 individuals in P. pelohatidis which have their two nuclei connected is 

 much larger than in P. intestinalis. 



PROTOOPALINA CAUDATA (Zeller). 



OpaUna caudata Zellek (1877). 



Hosts. — Bordbina homhina (Linnaeus) [=Bom'binator igneus 

 Laurenti] and Bomhina pachypa (Bonaparte) l=Bomhinator 



Fig. 17. — Puotoopalina caudata, form lata, from Bombina pacutpa ; the two fiROUPs 



ARE FROM DIFFERENT HOSTS : THE SHARP-POINTED ENDS ARB POSTERIOR : O, ESTRKMD 

 LATA FORMS ; b, LESS EXTREME FORMS WHICH SHOULD PROBABLY BE CLASSED AS LATA. 

 X 117 DIAMETERS. THE DOTTED LINES INDICATE THE BOUNDARY BETWEEN ECTOSARC AND 

 BXDOSARC. 



pachypus Bonaparte], from central and southeastern Europe. It 

 has been reported from a single specimen of Bufo viridis Linnaeus 

 from Naples, Italy, and I shall describe four infections from Dis- 

 coglossus pictus, Otth, which I place as a variety of this species. 



This species of Protoopalina occurs in two quite markedly dissimi- 

 lar forms, one slender, the other stocky. These would be regarded 

 as distinct species, were it not for the complete intergradation be- 

 tween them, and also for the fact that similar slender and swollen 

 forms are known in other species, as for instance, P. saturnalis and 

 Cepedea dimidiata. The forms are so divergent that they deserve 

 distinct names and separate description. 



Specimens of P. caudata have been deposited with the United 

 States National Museum. See Cat. Nos. 16432 (from Bomhina hom- 

 hina) and 16433 (from Bomhina pachypa). 



