475 
genus Corallobothrium Fritsch, belong in the family Proteocephali- 
dae which may be briefly characterized thus: 
Proteocephalidae: — Head small, without rostellum, unarmed 
or armed with minute spines. Fifth sucker functional, vestigial or 
lacking (?). Genital pore marginal, irregularly alternating. Testes 
numerous, dorsal, between vitellaria. Ovary bilobed, posterior. Vitel- 
laria lateral, follicular, follicles grouped about a central conducting 
tubule. Uterus median, ventral, with lateral out-pocketings and with 
one or more preformed ventral openings. Ovary, vitellaria, uterus and 
testes within inner longitudinal muscle-sheath. In fresh-water fish, 
amphibia and aquatic reptiles. 
Proteocephalus Weinland, s. str.: — Head globose or conical, flat- 
tened dorsoventrally. No rostellum, no spines, no hooks. No fold of 
tissue encircling base of head or enfolding suckers. Suckers circular 
or oval. Fifth sucker functional or vestigial, rarely lacking. Testes in 
one broad field between vitellaria. Vagina usually anterior to cirrus- 
pouch. Sexual organs as in family. Eggs with three membranes. 
In fresh-water fishes. 
The type-species is P. filicollis (Rudolphi) = P. ambiguus (Dujar- 
din). Here also belong P. longicollis (Rud.), P. macrocephalus (Creplin), 
P. percae (O. F. Mueller) = Taenia ocellata Rud., P. torulosus (Batsch), 
P. ambloplitis (Leidy), P. fossatus (Riggenbach), P. esocis (Schneider), 
P. skorikowi (v. Linstow), P. agonis (Barbieri), P. pentastomus (Klap- 
tocz), P. sulcatus (Klaptocz), P. pusillus Ward. Little-known species 
are P. osculatus (Goeze), P. salmonis-umblae (Monticelli), P. cyplops 
(v. Linstow), P. sagittus (Grimm), P. Remisphericus (Molin), P. microp- 
teri (Leidy), P. simplicissimus (Leidy), P. nematosoma (Leidy), P. sal- 
velini (Linton), Taenia dilatata Linton is a synonym of P. macrocephalus 
Creplin). 
New and heretofore but little known species are here diagnosed. 
Proteocephalus cernuae (Gmelin): — With characters of the genus. 
Strobila short, robust, up to 40 mm long x 1,5 mm broad. Head 
0,290—0,316 mm broad x 0,10- mm long, not well set off from neck. 
Suckers directed anteriad, heavily muscled, small, with deep cavities. 
Diameter of suckers 0,064—0,09 mm. Fifth sucker present, 0,24 mm 
in diameter. Neck broad, 1,7—2 mm long. All proglottids but few 
ripest broader than long. End proglottid present and functional. 
Genital pore near middle of lateral margin of proglottid, irregularly 
alternating. Cirrus-pouch short, reaching 2/,—1/; across proglottid 
breadth. Testes about 70, in one layer, and in a single broad field be- 
tween vitellaria. 
Vagina always anterior to cirrus-pouch and not crossing latter. 
