ART. 17 PARASITES OF AMPHIBIA AND EEPTILIA HAEWOOD 47 



number to six. Likewise, the host list for the genus has increased 

 until it now includes several mammals of diverse groups and one 

 reptile, a Mexican lizard. In the rectum of a turtle I found a 

 species that so closely resembles Ci'uzia tentaculata that it was at 

 first referred to that species. Indeed, the American representatives 

 of this genus are very similar to one another, notwithstanding the 

 diversity of their hosts. The genus is well characterized by an in- 

 testinal diverticulum, that projects into the esophageal region. So 

 pronounced is this character that some authors have recognized a 

 separate family, Cruziidae, based on it, while others have included 

 the genus in the Kathlaniidae. I have followed the latter course, as 

 the presence or absence of a diverticulum does not seem to me to be 

 of more than generic rank. 



CRUZIA TESTUDINIS, new species 



Specific diagnosis. — Cruzia: The parasite is a smooth, white worm, 

 somewhat attenuated at the ends. The greatest diameter lies just 

 caudal to the end of the esophagus. The cuticula is smooth and thick. 

 The mouth is surrounded by three large triangular lips, each of which 

 bears near its inner angle a pair of conspicuous papillae. Aside from 

 these there are two double papillae on the dorsal lip, and another, 

 likewise double, on each of the subventral lips. Each subventral lip 

 also bears an amphid. This organ opens by a minute pore near the 

 summit of a large papillalike prominence. 



Male: Mature males vary from 7.3 to 13.5 mm in length and from 

 0.4 to 0.6 mm in width. The entire esophagus is from 1.8 to 3.17 mm 

 long. It is divided into four parts : The first part, or pharynx, is 0.2 

 to 0.29 mm long; the second tubular part is 1.17 to 2.5 mm long; the 

 third part, a small bulb, is 0.07 to 0.15 mm long; and the fourth part, 

 a large bulb, is 0.27 to 0.31 mm long. The nerve ring is 0.47 to 0.77 

 mm, and the excretory pore is 0.8 to 1.4 mm, respectively, from the 

 cephalic end. The intestinal diverticulum varies from 0.5 to 1.1 mm 

 in length. The male tail bears nine papillae, which are distributed 

 exactly as in the well-known Cruzia tentaculata. The spicules are 

 0.76 to 1.05 mm long, and the gubernaculum is 0.13 to 0.16 mm long. 

 The tail is 0.13 to 0.19 mm long, sharply pointed, and curved slightly 

 ventrad. 



Female : The female is 10 to 15 mm long and 0.4 to 0.65 mm wide. 

 The esophagus is 3 to 3.8 mm long, of Avhich 0.25 to 0.32 mm is 

 pharynx, 2.3 to 3 mm is narrow, tubular portion, 0.09 to 0.13 mm 

 is the .small bulb, and 0.32 to 0.30 mm is the larger caudal bulb. 

 The intestinal diverticulum is 0.85 to 1.2 mm long. The nerve ring 

 is 0.54 to 0.66 mm, and the excretory pore is 1.34 to 1.71 mm from 

 the anterior end, respectively. The vulva lies near the middle of 

 the body, usually a trifle caudal of the middle in young worms and 



