ART. 21 NEW SPECIES OF TREMATODE WORMS CHANDLER 3 



The ovary is situated on the right side of the body between the 

 two testes, but somewhat nearer the posterior one. It is round, oval 

 or somewhat triangular in shape, not lobate, and measures about 88m 

 to 100m in transverse diameter and somewhat less dorso-ventrally. 

 The shell gland is situated just medial to the ovary, and is connected 

 with the latter by a short oviduct; the shell gland is relatively large, 

 having a diameter of about 60m to 65m. Posteriorly it gives off the 

 rather well-developed Laurer's canal which turns and runs straight 

 dorsalty. The vitellaria are much less abundant than in H. tricolor, 

 and occupy a rather narrow lateral area from just behind the level 

 of the pharynx to about the level of the ovary. The ducts cross the 

 body at about the level of the ovary and shell gland and form a small 

 triangular reservoir where they meet near the latter organ. The 

 ducts can not be followed in whole mounts and their course is very 

 difficult to follow in sections. The uterus is extremely thin-walled, 

 and its convolutions can not be followed in either whole mounts or 

 sections. In sections the eggs appear to be scattered through the 

 body, the thin-walled uterine tubes being indistinguishable from 

 spaces in the parenchyma. The eggs are most numerous in the part 

 of the bodj^ between the anterior testis and the oral sucker, on the 

 left side posterior to the posterior testis, and betw^een the testes, 

 but in no specimens are the eggs solidly massed as is the case in 

 specimens of H. tricolor which I have examined, and as they have 

 been figured and described by Stiles and Hassall. The terminal part 

 of the uterus, where it opens beside the cirrus, is thick-walled and 

 conspicuous in sections, but this portion, which runs antero-medially 

 from the genital pore, is short and soon loses its distinct wall. The 

 eggs are oval, about 21m to 22m long by 13m to 15m broad. 



Host. — East Texas cotton-tail rabbit, Sylvilagus floridanus alacer, 

 and Texas jack rabbit, Lepus texianus (collected by Francis); in 

 small intestine. 



Locality.— Rouston, Tex. (Chandler), and College Station, Tex. 

 (Francis) . 



Type specimens. — Cat. No. 8026, United States National Museum 

 Helminthological Collections; paratypes, Cat. No. 8027. 



This fluke is clearly closely related to Hasstilesia tricolor, which was 

 first described by Stiles and Hassal (1894) from Lepus americanus 

 and L. sylvaticus from Maryland to Virginia, and later reported by 

 Hall (1916) as being reported from Long Island, N. Y., and also from 

 jack rabbits at College Station, Tex. (reported by Doctor Francis of 

 the Texas A. and M. College). Doctor Francis very kindly sent me 

 a slide of the specimens collected from jack rabbits for comparison 

 with my specimens and with H. tricolor. They conform in every 

 detail, except the size of the testes, which is very variable anyway, 

 with my Houston specimens. The geographic range of H. tricolor is 



