24 
purpose of comparison has not been successful. The three species in 
question may be distinguished by the following key and diagnoses : 
KEY TO THE SPECIES OF HOMAEOGASTER. 
1. Testicles placed obliquely : oral papilbe not reported ; genital pore near 
equator of esophagus; type locality, Java H. palonise (p. 24). 
2. Testicles, one caudad of the other ; oral papilkp present ; genital pore at 
equator of esophagus ; type locality, Manila, P. I. . 
H. philippinensis (p. 2.5). 
3. Testicles on same transverse plane and divided into 2 large equal lobes. 
simulating 4 testicles ; oral papillae present : genital pore caudad of 
bifurcation of intestine: type locality. Tonkin H. poiritri (p. 24). 
In view of the comparatively restricted knowledge of this genus 
it seems advisable to give our present data regarding the two species 
already described before passing to a discussion of the new form, 
HOMALOGASTER PALONIiE Poirier, 1883. 
(Figs. 27 to 28.) 
1883: Homalogaster palonix Poirier, 1883, 74-76, pi. 2, figs, la-b ( cecum of 
Palonia frontalis; from Java). — For bibliography see Stiles and 
Fiassall, 1908. Index Cat., Trematoda, Bull. 37, Hyg. Lab., FT S. P. H. & 
M. H. S. 
Specific diagnosis. — Homalogaster (p. 23) : Something over 12 mm. long: 
form lanceolate : anterior cephalic portion A*ery pointed, 11 mm. long by G mm. 
in maximum breadth : caudal ixtrtiou much shorter. 3 mm. in maximum breadth. 
Genital pore on center of a papilla 1.5 mm. from very small terminal mouth. 
Venter with alternating longitudinal rows of large papillm extending from 
about 3 mm. from oral margin to acetabulum. Acetabulum 2 mm. in diameter. 
Oral papilla^ are not reporte<l. Esophagus bifurcates 3 mm. from mouth ; 
intestinal ceca extend to end of anterior portion of body. 
Male organs: Testicles small, placeil obliquely in cephalic half of body be- 
tween ceca : one slightly to the right of the median line and 4 mm. from oral 
margin : the other 2 mm. further caudad, slightly to the left of the median 
line. 
Female organs: Ovary 9.5 mm. from oral margin: vitellogene glands rami- 
fied. along the sides of body : uterus almost without coils. Excretory jx)re 
dorsal, 12 mm. from mouth ; excretory vesicle with 2 lateral lobes. — Based on 
Poirier, 1SS3, 74-76. 
Habitat. — In cecum of "Palonia frontalis," from .Java. 
HOMALOGASTER POIRIERI Giard and Billet, 1892. 
1892; Homalogaster poirieri Giard and Billet. 1892a. 615 (large intestine of 
cattle: Tonkin). — For bibliography see Stiles and Ilassall, 1908, Index 
Cat.. Trematoda, Bull. 37. Hyg. Lab.. U. S. P. H. & M. H. S. 
Specific diagnosis. — Homalogaster (p. 23) : Size not given. Mouth with 
slender digitate papilhe. Genital pore caudad of intestinal bifurcation, on 
elevated papilla, visible to naked eye. a little behind pharynx. Acetabulum 
very large. Pharynx followed by 2 long simple ceca, which extend in almost 
a straight line to nearly the latitude of acetabulum ( ?? indicating absence of 
esophagus). Vasa deferentia (?effereutia) short, thick, tortuous; testicles lat- 
