PHYLLODISTOMUM AMERICANUM. 257 



specimens found by opening the bladders of salamanders which 

 had been preserved in formaline for anatomical work. These 

 latter were, many of them, quite decidedly translucent. I think 

 it likely that as soon as I can obtain living specimens I shall find 

 them at least somewhat translucent if less so than Stafford's. 



The form of the body in G. translucida is slender and parallel- 

 sided, and not at all inclined to a spatulate form. While this is 

 quite unlike the form of Fig. I, there are among my specimens 

 some in which the body is very slender. I have not yet decided 

 to what extent this may be due to the youth of the specimen. 

 Young worms found in bladders with mature specimens and 

 apparently earlier forms of this species are decidedly slender in 

 outline and not spatulate. I have even found some in which 

 eggs were already filling the uterus in which this elongate form 

 was still psesent. I have little doubt that fully mature older 

 specimens all become spatulate eventually. These facts indicate 

 a gradual shading from one to the other of these contrasted body 

 forms. 



There appears also to be considerable similarity in the ar- 

 rangement of the coils of the uterus in these two forms. 



The location of the ventral sucker is much farther forward in 

 G. translucida than in P. americannm, being in the former 20 per 

 cent, of the total length from the anterior end and in the latter 

 32-42 per cent. The testes are located in the hinder third of 

 the body and are deeply lobed in P. americannni, and are in the 

 middle third and are nearly entire in G. translucida. The 

 ovary is behind the middle of the body not near the ventral 

 sucker and is deeply lobed in P. americanum. and is in front of 

 the middle of the body near the ventral sucker and entire in G. 

 translucida. 



These differences are not entitled to be rated as of sufficient 

 value to justify placing these forms in different genera, unless 

 the body form proves to be a difference of more importance 

 than at present appears. It is the only character that is offered 

 by Looss, '99, by which to distinguish his Spaihidium ( = Pliyllo- 

 distomuni of Braun, '99) from Gorgodera, though some species of 

 the latter (e. g., G. cygnoides] differ in having many testes in- 

 stead of a single pair. For the present and until more is known 



