No.432.] MORTH-AMERICAN INVERTEBRATES. 957 
. Body elongate, without spines; acetabulum prominent, larger than 
oral sucker; yolk glands voluminous, back of acetabulum; 18 mm. 
long, 0.34 mm. wide: in intestine of tomcod (Microgadus tomcod) 
Distomum simplex (R.) Linton (38, 40, 33) 
. Body elliptical, spiny ; a pair of groups of ocelli near mouth; acetab- 
ulum of same size as oral sucker; testes in oblique plane; pre. 
pharynx, pharynx, and cesophagus present; yolk glands voluminous, 
filling body back of acetabulum ; 2-2.5 mm. long: in pyloric cceca 
of Cottus scorpius . . . + + Distomum oculatum Lev. (33) 
Body elongate, without spines, anteriorly cylindrical, posteriorly 
depressed; acetabulum larger than oral sucker, near middle of 
body; prepharynx, pharynx, and oesophagus present; testes and 
ovary in median line, close together; yolk glands voluminous, 
extending from acetabulum to hinder end ; 1.78 mm. long, 0.33 mm. 
wide : in intestine of Mola mola | Distomum fragile Linton (39, 40) 
4,. Body elongate, linguiform ; prepharynx, pharynx, and cesophagus 
present; yolk glands voluminous, filling body back of testes ; 
4.35 mm. long, r mm. wide: in intestine of Pseudopleuronectes 
Distomum globiporum (R.) Linton (40) 
& 
e 
& 
a 
americanus . s +» + 
GENUS CREPIDASTOMUM. 
Papille small; body elliptical ; acetabulum smaller than oral sucker; 
pharynx and short cesophagus present; yolk glands voluminous, 
extending from pharynx to hinder end of body and overlapping 
intestinal coeca; 1.5-4 mm. long, 0.5-1.5 mm. wide: in rectum of 
dep eee OU) Im UD 
. Papille large; body linear, tapering towards hinder end; oral sucker 
larger than acetabulum, but both large; esophagus absent; yolk 
glands extend entire length of body; 1.7-2.2 mm. long, o.6 mm. 
wide: in intestine of lake sturgeon (Acipenser rubicundus) 
C. auriculatum (Wedl) Linton (38) 
& 
m 
& 
w 
GENUS AZYGIA. 
Body subcylindrical, light flesh color, posterior rounded. Ventral ace- 
tabulum 3 line behind oral, } line in diameter. Oral acetabulum } line. 
Length 8 lines; breadth posterior } line, anterior 4 line. i 
before acetabulum: in stomach of Esox . 4. tereticollis (R.) Leidy (21) 
GENUS RENIFER. 
a, Body elliptical; genital pore near left edge of body; 3-4.2 mm. long, 
1.1-1.6 mm. wide: in mouth of Heterodon platyrhinus 
R. ellipticus Pratt (Fig. 53) (77) 
pore near median line, but a little to left of 
in mouth of Heterodon platyrhinus 
R. elongatus Pratt (77). 
a, Body elongate ; genital 
it; 3 mm. long, 0.68 mm. wide : 
