
QIO THE AMERICAN NATURALIST. 
l 
, Anterior ridge not noticeably high; vesicula seminalis 
not skeinlike Pleurogonius Lss. (Fig. 121) (49) 
Ovary behind testes, of which about fifteen are present, arranged 
in two longitudinal parallel rows Charaxicephalus Lss. (49) 
h,. Anterior circular ridge without ventral indentation ; intestinal caeca 
with numerous side projections; testes and ovary deeply lobate 
in hinder end of 
i, Hinder end of body truncated or concave ; cirrus sac long and 
with vesicular seminalis extending the greater part of the 
length of the body .  Cricocephalus Lss. (Fig. 122) (44) 
i. Hinder end of body rounded ; cirrus sac in transverse plane 
Pyelosomum Lss. (Fig. 123) (44) 
4» Anterior end not set off from rest of body. 
h,. Longitudinal ridges or rows of glands on ventral surface; testes in 
same transverse plane in hinder part of body. 
i. Three rows of glands on ventral surface ; intestinal coeca long 
and without projections; ovary between testes: in birds 
Notocotylus Dies. (Fig. 124) (44) 
i,. About fifteen longitudinal ridges on ventral surface; cirrus sac 
very large: in intestine of cetaceans 
Ogmogaster Jag. (Fig. 125) (3) 
A,. Ventral surface without ridges or rows of glands 
i,. Yolk glands laterad of intestinal cceca in hinder portion of body; 
testes in oblique plane. 
Jı. Ovary between testes ; intestinal coeca very narrow ; uterus 
extends to end of body : in birds 
Stictodora Lss. (Fig. 126) (44) 
Jo Ovary in front of peri intestinal cceca broad ; uterus in 
front of ovary : h 
5. 
Galactosomum Lss. (Fig. 127) (44) 
i, Yolk glands on both sides of intestinal coeca in middle and hinder 
part of body. 
jı But one testis present; ovary in front of it: in Bagrus 
Haplorchis Lss. (Fig. 128) (44) 
ja Testes in same transverse plane: ovary behind them ; intes- 
tinal coeca enclose both ; body circular or oval: in Box 
Mesometra Lühe (Fig. 129) (54) 
(To be continued ) 

