ART. 17 PAEASITES OF AMPHIBIA AND KEPTILIA HAEWOOD 11 



the median as well as the lateral fields. The eggs are oval, measuring 

 50fj. by M/x. The testes are not quite symmetrically placed, the 

 right one being slightly caudal to its mate; they measure about 

 80fx by 47/A. They are slightly obscured by the eggs ventrad and 

 the vitellaria dorsad. The vasa efferentia could not be traced, but 

 a seminal vesicle appears in the cirrus pouch. The cirrus pouch 

 is a V-shaped structure, with the ventral arm the longer and more 

 distended. It runs cephalo-laterad for a short distance, then loops 

 back in a medio-caudal direction. It ends dorsal to the center of 

 the acetabulum. The excretory system could not be seen. 



Host. — Storeria dekayi. 



Habitat. — Intestine. 



Locality. — Houston, Tex. 



Type s'pecimen.—V,.^:^M. Helm. Coll. No. 30873. 



Remarks. — This species is easily distinguished from other known 

 species of Brachycoeliuni by the distribution of the vitellaria. Also 

 the acetabulum is more posterior than in most species, but this is a 

 poor character because of the distention of the posterior end by the 

 Qgg mass in fully matured individuals. 



BRACHYCOELIUM sp. 



A single poorly prepared specimen taken from the intestine of 

 Opheodrys aestivus is referred to this genus. This is the same host 

 from which Nicoll (1914a) described Brachycoelium ohesum,^ but the 

 distribution of the vitellaria is somewhat different from that figured 

 by Nicoll, and consequently it is impossible to refer it to his species. 



BRACHYCOEUUM MERIDIONAUS, new species 



Pl.\te 1, Figure 4 



Specific diagnosis. — Brachycoeliwn : A small oval worm, colorless 

 except where the eggs show through. Length 0.8 mm to 0.95 mm, 

 width 0.3 mm to 0.4 mm. The cuticula is thickly studded with small 

 spines in the cephalic regions, but these become sparser caudad. The 

 oral sucker is subterminal and measures about 0.145 mm in diameter. 

 The acetabulum lies near the caudal boundary of the first third of 

 the body and has a diameter varying from 0.125 mm to 0.138 mm. 

 The ratio of the oral sucker to the acetabulum is very close to as 3 : 2. 

 The pharynx is an oval with the long diameter lying transversely. 

 It measures 38/a by bOfi. The esophagus is about twice as long as 

 the pharynx. In fully matured individuals these two structures are 

 often wholly concealed by the transverse band of vitellaria. The 

 intestinal ceca are short pockets, measuring 85/x by 130yu. The testes 

 are 105/x to 115/* in diameter and are slightly irregular in outline. 

 They lie one on each side of the body, their cephalic margins near the 



