Ai!T. 17 PARASITES OF AMPHIBIA AND EEPTILIA HAIIWOOD 23 



Genus DASYMETRA Nicoll, 1911 



DASYMETRA CONFERTA Nicoll, 1911 



I have a total of 26 specimens of this fluke taken from the mouth 

 of two specimens of Natrix sifedon fasclata at Houston, Tex. This 

 genus was established in 1911 to receive a single species described 

 at that time from the mouth of Natrix rhombifera. 



There are two points in which my material shows slight differences 

 from NicoU's description. Nicoll (1911, p. 684) writes as follows: 



The cirrus pouch is short aud stout ; iu some cases almost globular. * * * 

 As already mentioned, the latter (cirrus) was exserted in every case, so that 

 the arrangement depicted in Figure 8 (PI. XXVIII) must be regarded as 

 hypothetical. 



In my material there are specimens with both exserted and with- 

 drawn cirrus. In the former condition the cirrus pouch is quite as 

 Nicoll has described it, but in the latter condition it is considerably 

 more elongate. In a typical case it is an elongated sac curving to 

 the left of the acetabulum and just reaching the caudal border of 

 that structure. In the caudal end of the cirrus sac is a coiled seminal 

 vesicle, of the usual type for this group. The pharynx is not globular 

 but oval, with the long axis located transversely. Its anterior margin 

 is typically lobate. It measures on the average 0.24 by 0.38 mm. 



Genus MANODISTOMUM Stafford, 1905 



Stafford founded this genus for a single species, M. occulturn. The 

 genus is poorly defined and has not been recognized again until Price 

 (1930) pointed out that Plagitura Holl (1928) was a synonym of 

 Manodistovium. In the following discussion I show that other forms 

 should also be referred to this genus. 



MANODISTOMUM OCCULTUM Stafford. 1905 



This is the type species of the genus and was reported originally 

 from two hosts, Dieinyctylus viridescens and Rana virescens. The 

 description, however, was based solely on material from the former 

 host. In his discussion of the species, Stafford states that its habitat 

 in the newt was unknown to him, but certain forms, which he had 

 found encapsuled in the muscles of the frog, appeared to be the same, 

 although slightly less mature. My material of this species consists 

 of four specimens, two of which were found in Tritwrus viridescens 

 {=Diemyctylus vindescens) at Elizabethtown, N. Y., and two from 

 Triturus meridionalis at Houston, Tex. In both cases they were in 

 the intestine, and while the Texas specimens, one of which is figured, 

 were barely mature, the New York specimens were fully mature. All 



