37] 



PROTEOCEPHALIDAE — LA RUE 



37 



61(58) Testes number 150-215 Ophiotaenia perspicua La Rue 1911 



62(53) Genital pore at or near middle of margin of proglottid 63 



63(66) Heads 1.5 mm. or more in breadth 64 



64(65) Muscular wall of suckers of nearly constant thickness about 

 entire circumference; testes number 150-240. 



Ophiotaenia marenzelleri (Barrois 1898) 

 65(64) Muscular wall of suckers much thickened on anterior mar- 

 gin ; testes number about 200. 



Ophiotaenia punica (Cholodkovski 1908) 



66(63) Heads less than 1.5 mm. broad 67 



67(68) Testes number 130-160; ductus ejaculatorius forms several 

 coils; 24-35 uterine pouches on either side. 



Ophiotaenia calmettei (Barrois 1898). 

 68(67) Testes number 200-250 ; ductus ejaculatorius nearly straight ; 

 40-60 uterine pouches on either side. 



Ophiotaenia grandis La Rue 1911 

 69(50) Suckers with point of lower margin re-entrant into cavity of 



sucker Genus Crepidohothrium Monticelli 1899. 



The only know species of this genus is 



Crepidohothrium gerrardii (Baird 1860). 



70(1) Heads with folds or lappets of tissue about suckers _ 71 



71(72) A single fold of tissue partially covering the base of suck- 

 ers; head conical Genus Choanoscolex La Rue 1911. 



The only known species is 



Choanoscolex ahscisa (Riggenbach 1896). 

 72(71) Many folds or lappets of tissue about suckers; anterior 

 surface of head flattened; suckers set in flattened end 

 of head Genus Corallohothrium Fritsch 1886. 



DESCRIPTION OF SPECIES 



In this section are described the species of the following genera: 

 Proteocephalus, sensu strictu, Choanoscolex La Rue 1911, and Ophio- 

 taenia La Rue 1911, of the family Proteocephalidae. The species of 

 Monticellia La Rue 1911, belonging in the new family Monticellidae, have 

 also been described. Other species which have been mistakenly placed 

 in the genus Proteocephalus have been considered and where possible 

 their rightful position pointed out. The species of Corallohothrium and 

 of Acanthotaenia have not been re-described. 



