ART. 17 PARASITES OF AMPHIBIA AND REPTILIA HARWOOD 49 



but gradually growing fainter caudad. The esophagus has the char- 

 acteristic bulb, and just behind that structure the excretory pore 

 opens on the ventral surface. 



Male: Length 2.25 to 3 mm; width 0.15 to 0.17 mm. The esopha- 

 gus is 0.5 to 0.51 mm long, and the bulb measures 84ju, to 92^ by 108/i 

 to 116/i. The nerve ring is 0.16 to 0.2 mm from the anterior end, and 

 the excretory pore 0.8 to 1.1 mm. The male tail ends rather bluntly 

 and is 0.1 to 0.125 mm long. The cloacal opening is surrounded by 

 the usual three pairs of papillae. The pedicles of the preanal pair 

 are dome-shaped. The next pair caudad has long stout pedicles, 

 while those of the caudal pair are very much bent. Both of the more 

 caudal pairs are included in the caudal alae. No spicule could be 

 seen, and if present it must be imperfectly cutinized. A well- 

 developed genital cone is present and is about l7/x long. A cuticular 

 fold, starting at the base of the cone, overlies a part of its ventral 

 surface. The distal end of the fold is emarginate and at each side 

 more or less pointed. The internal male genital organs are of the 

 ordinary type. A seminal vesicle is preceded by the single testis, 

 whose most cephalic extent is about 0.2 mm posterior to the excretory 

 pore. 



Female: Body length 3.4 to 4.6 mm; wadth 0.13 to 0.2 mm. The 

 esophagus is 0.55 to 0.7 mm long; the nerve ring and the excretory 

 pore are 0.16 to 0.18 and 0.9 to 1.05 mm, respectively, from the an- 

 terior end. The esophagus ends in a characteristic bulb 0.114 to 

 0.125 mm wide and 0.125 to 0.14 mm long (the length includes the 

 narrow anterior neck of the bulb). The vulva, as in most members 

 of this genus, follows immediately after the excretory pore. It is 

 1 to 1.2 mm from the lips. The vagina extends along the ventral 

 body wall about 0.75 mm, then crosses over and gives rise to the 

 two divergent uteri, which in turn give rise to the ovaries. Because 

 of the excessive number of eggs in the uteri, it is impossible to trace 

 out their convolutions accurately in whole mounts. The female tail 

 is unusual for the genus, for instead of narrowing abruptly just 

 behind the anus it tapers gradually to a sharp point. It is 0.5 to 

 0.7 mm long. The eggs have the usual plugs in each end ; they vary 

 from 125/x by 34/i to 130/* by 36/x. 



Host. — Cnemidophorus sexUneatiis. 



Habitat. — Rectum. 



Locality. — Huntsville, Tex. 



Type speci77ien.—\J.S.'NM. Helm. Coll. No. 31701. 



Remarks. — This species belongs to that group of the genus Flmryn- 

 godon in which the caudal papillae are included in the caudal mem- 

 brane. These include the species hindlei^ Tiiamillatus., spinicauda., 

 incrTnicavda^ and tiliquae. From all these, as well as from P. hatra- 



126821—32 4 



