No. 432.] MORTH-AMERICAN INVERTEBRATES. 963 
PARASITIC IN AMPHIBIANS. 
Encapsuled under skin of Stren lacertina Distomum sirenis Vail. (90) 
Body elliptical; intestinal coeca short, reaching to acetabulum ; excretory 
vesicle large, the crura reaching to acetabulum; 0.7 mm. long, 0.45 mm. 
wide: in thoracic cavity of grass frog and encysted in anterior part of 
bullfrog . . . . . . . . Jistomum tetracystis (Gal.) Stafford (79) 
Body whitish, oblong, sublinear, narrowed anteriorly ; oral sucker larger 
than acetabulum; 3 mm. long, 0.5 mm. wide: in Rana halecina 
Distomum retusum (Duj.) Leidy (20, 21) 
PARASITIC IN FISH. 
Body elongate; suckers near each other, acetabulum somewhat pedun- 
culate ; genital pore in front of latter; 15 lines to 3 inches long, $ line 
wide: in mouth of Esox . . . . . . Déstomum longum Leidy (20) 
* Body long and narrow, band-like, with ventral disk at anterior fourth ; 
smooth.” “Ventral acetabulum about the width of body; oral disk 
smaller”; 8 mm. long, 0.87 mm. wide: in mouth, throat, and gills of sand 
pike (Saurus fatens) «. « + + + +: Distomum ischnum Leidy (32) 
* Body flat, elongated elliptical ; echinated between oral and ventral 
acetabula, which are equal, and the latter one is hemispherical and sessile. 
Length 21 to 3 lines, breadth 3-5ths to 4-5ths of a line.” In intestine of 
Leiostomus obliquus... + + * ? Distomum incivile Leidy (21) 
* Body ovoid, anteriorly compressed, conical and incurved, posteriorly 
robust and obtuse.” **Acetabulum much larger than mouth.” “Genital 
pore a little in advance and to left of acetabulum, provided with prominent 
circular lip”; length 1-2} lines; breadth 4-1 line: in gall bladder of 
e. o sn Distomum biliosum Leidy (23 
oval; 20 mm. long, 6 mm. wide: in body cavity of 
uq En Distomum lageniforme Linton (38) 
Body elliptical, without spines ; acetabulum larger than mouth ; testes in 
same transverse plane nearit; ovary in front of testes; intestinal ceca 
long; 1.25-6 mm. long, 0.7-2.6 mm. wide : in intestine of Spheroides macu- 
E | 2 1 5 4 a ve vc o» y Distomum vibex Linton (39) 
Body wide and thick, without spines, bluntly rounded at both ends; 
acetabulum very large ; cesophagus short, intestinal coeca long; testes and 
ovary close together in hinder part of body, the latter in front of former ; 
uterus voluminous, filling body back of acetabulum ; genital pore to right 
of pharynx; 2.75 mm. long, 1.4 mm. wide: in intestine of tilefish 
Distomum fecundum Linton (39) 
Body broad, spiny ; acetabulum small, in anterior half of body ; cesopha- 
gus short, intestinal caeca long; testes behind ovary, side by side; genital 
pore to left of pharynx; o.7-1.3 mm. long, 0.4-0.64 mm. wide: in intestine 
of white perch >.. . . istoemum areolatum (R.) Linton (39) 
unknown fish. . 
Body elongate, 
Remora remora . . 
