ART. 4 FOUR NEW TEEMATODE WORMS PRICE 7 



The species of Echinochasmus, E. schwartzi^ described in this 

 paper is clearly separated from all the above species except E. 

 olig acanthus^ E. mordax, and E. pitangi on the basis of the number 

 of collar spines. E. schwartzi may be differentiated from E. oli- 

 gacanthus on the size and arrangement of the collar spines and on 

 the comparative size of the suckers. In E. schwurtzi the collar 

 spines are distinctly smaller than those of E. oligacanthus ; the row 

 of spines is interrupted dorsally by a space as wide as the oral sucker 

 in the former while in the latter this interruption is very slight. 

 The size ratio of oral sucker to acetabulum is about 1:2 in E. 

 schioartzi and more than 1:4 in E. oligacanthus. It may be dif- 

 ferentiated from E. mordax by its shorter anterior body length and 

 by the position of the cirrus pouch which in E. mordax lies largely 

 preacetabular, while in E. schwartzi the posterior end of the cirrus 

 pouch almost reaches the posterior border of the acetabulum. In 

 addition, the collar spines and eggs of E. r)iordax are considerably 

 larger in proportion to the body size than those of E. schwartzi. 

 It is rather diiRcult to differentiate E. schwartzi from E. yitangi 

 owing to the extremely meager description of the worm as given 

 by Lutz (1924). Aside from the length, 2.4 to 3.4 mm., the charac- 

 ters given for E. pitangi might apply equally to any of the other 

 species of the genus and even to species of some of the other genera. 

 So far as one can judge from the figure of E. pitangi, it may be 

 distinguished from E. schioartzi in the more posterior position of 

 the testes in the former and in the size of the eggs as compared 

 with the size of the ovary. The eggs as shown in Lutz's figure are 

 longer than the diameter of the ovary and about two-thirds as 

 wide, while in E. schwartzi the eggs have no such large size in com- 

 parison with the size of the ovary. 



Family UROTREMATIDAE Poche, 1926 



UROTREMA SHILLINGERI, new species 



Figure 3 



Specific diagnosis. — Urotrevia: Body elongated, 2.6 mm. long by 

 418ft wide in the region of the ovary, slightly flattened dorso-ven- 

 trally and tapering gradually anteriorly and posteriorly. Cuticle 

 apparently without spines ; however, this point can not be determined 

 with certainty from the material available. Oral sucker subterminal, 

 112/x in diameter, situated 487/i, from the oral sucker. Prepharynx 

 37/A long; pharynx 67ju, long by 90/* wide; esophagus 52/a long, bi- 

 furcating about midway between the suckers ; intestinal ceca simple, 

 extending posteriorly to within a short distance from the base of 



