No. 431.] MWORTH-AMERICAN INVERTEBRATES. 909 
d,. Body very elongate (up to a meter in length) and filiform ; intestine 
wanting but mouth present . . ematobothrium v. Ben. (3) 
€» Worms not found in pairs enclosed in cysts Family VII. Monostomide 
d,. Testes directly behind one another in middle of body ; ovary behind 
them; body usually elongate, anterior end not set off; genital 
pore near anterior end; cirrus sac wanting ; uterus not volumi- 
nous ; intestinal coeca do not extend to end of body : in intestine 
of reptiles . . SN Microscaphidiinze 
é, Uterus canna bete ioteetinal caec 
Microscaphidium x (Fig. 116) (44, 45) 
£,. Uterus overlaps intestinal coeca 
Deuterobaris Lss. (Fig. 117) (44, 45) 
Testes either in same transverse plane or obliquely behind one 
another; ovary usually in front of testes or between them. 
e, Genital pore at hinder end of body, which is broad; pharynx 
wanting: in Halicore Opisthotrema Leuck. (Fig. 118) (3) 
€» Genital pore in anterior half of body. 
` fy Intestinal coeca join at their hinder ends; testes obliquely 
behind one another: in water birds 
Cycloceelum Brds. (Fig. 1 19) (44) 
f. Intestinal coca not thus joined. 
g, Anterior end more or less triangular, being set off by a 
circular muscular ridge from rest of body ; testes and 
ovary often lobate in hinder end of body: in marine 
Subfamily II. Pronocephalinz 
A 
turtles 
E. pes dds with a deep indentation on the 
ventral side. 
i, Ovary in front of testes, of which two are 
resent. 
Intestinal coeca without side projections and 
with their posterior ends laterad of the 
testes ; latter not in same transverse plane 
Pronocephalus Lss. (Fig. 120) (44) 
Intestinal ceca with side projections and 
with their posterior ends mediad of "ege 
which are in same transverse plan 
k,- Ventral surface with four pe 
rows of groups of glands 
Adenogaster Lss. (49) 
Ae 
Jo 
k,. No ventral glands. 
Anterior circular ridge very high; 
vesicula seminalis very long and 
winding skeinlike outside the 
cirrus sac 
Glyphicephalus Lss. (49) 
h. 
