46 PEOCEEDINGS OF THE NATIONAL MUSEUM vol.81 



sists of three parts, a pharynx, a cylindrical midportion, and a termi- 

 nal hourglass-shaped bulb. The tail of both sexes is sharply pointed. 



Male: 10 to 12.5 mm long and about 0.4 wide. The pharynx 

 is about 0.1 mm long, and the entire esophagus varies from 2 mm 

 to 2.25 mm in length. The hourglass-shaped bulb is 0.39 to 0.44 

 mm long and 0.22 to 0.24 mm wide. The nerve ring and excretory 

 pore are about 0.44 and 1.3 mm, respectively, from the anterior end. 

 The tail measures 0.42 to 0.5 mm in length. The spicules are 3.4 to 

 3.9 mm long, about 40/* wide near the anterior end, and plainly cross- 

 striated. The gubernaculum is about 0.17 mm long. The papillae 

 are very similar in arrangement to those of S. afflne. There are tAvo 

 ventral pairs placed slightly beyond the middle of the tail, and at the 

 same level a subdorsal pair. There are three ventral pairs, placed 

 close together just caudal to the cloacal opening, and again at the 

 same level a subdorsal pair. There are three pairs of preanal papillae, 

 but in this species they are not evenly spaced. The anterior two 

 pairs of these rows are farther apart than the posterior two pairs. 

 A precloacal sucker is plainly outlined by the musculature, but it 

 does not possess a cutinous rim. 



Female: 12.5 to 13.75 mm long, and 0.5 to 0.55 mm wide. The 

 pharynx is about 0.13 mm long, and the esophagus is 2.33 to 2.52 

 mm long. The hourglass-shaped bulb measures 0.4 to 0.51 mm by 

 0.24 to 0.26 mm. The nerve ring and excretory pore are 0.45 and 

 1.3 mm, respectively, from the anterior end. The vulva is 8.5 to 

 9 mm from the anterior end, and therefore lies close to the cephalic 

 end of the caudal third of the body. The tail is 0.6 to 0.75 mm long. 



Hosts. — Ghelydra serpentina and Amyda ferox. 



Habitat. — Rectum. 



Localities. — Houston, Tex., and Whitehall, N. Y. 



Type specimen. — U.S.N.M. Helm. Coll. No. 31699; paratype, 

 No. 31700. 



Remarks. — This species very closely approximates in size and in 

 many structures Falcaustra afflne and F. procera, but from these it 

 is easily distinguished by the extremely long spicules. 



FALCAUSTRA CATESBEIANAE Walton, 1929 



This is a very common parasite of the bullfrog {Rana coiesbeiana) 

 both at Houston and at Huntsville, Tex. 



Genus CRUZIA Travassos, 1917 



Until recently this genus has contained only one species, Gruzia 

 tentaculata from opossums, but Maplestone (1930), Khalil (1926), 

 and Khalil and Vogelsang (1930 and 1932) have raised the total 



