1431 PROTEOCEPHALIDAE—LA RUE 143 



many species, could not be demonstrated. The outer shell, in this case 

 corresponding to the second shell of most Proteocephalus species, was 

 thick and quite granular. It measured 0.026-0.036 mm. in diameter, 

 0.026-0.029 mm. being the more common dimensions. The embryo, itself, 

 varies from spherical to ovoidal. The diameter varies from 0.017 to 

 0.019 mm. and rarely 0.021 mm. for a long oval embryo. 



The identity of this species with Linton's T. dUatata has already 

 been discussed. Whether it is the same as P. hemisphaericus cannot 

 now be determined. A discussion of its relationship to that form is 

 given under the description of P. hemisphaericus. Proteocephalus mac- 

 rocephalus shows no marked resemblances to any other of the North 

 American species of Proteocephalus. In some respects it shows some 

 marked resemblances to P. cernuae La Rue but it differs from that 

 species in lacking a fifth sucker, in the possession of many more and 

 larger testes, in having a cirrus-pouch that is much shorter actually and 

 relatively, in having a much more voluminous mass of vas deferens and 

 in having smaller embryos. The proportions of the proglottids are also 

 different. While in some respects this species resembles P. percae its 

 lack of a fifth sucker readily differentiates these two species. Moreover 

 its very short cirrus-pouch is in marked contrast with the very long 

 cirrus-pouch of P. percae. This species is very different from P. torulo- 

 siis in size, in the arrangement of the testes, in the size of the cirrus- 

 pouch and in the number of uterine pouches. 



PROTEOCEPHALUS AMBLOPLITIS (Leidy) 

 [Figs. 18, 19, 116, 117, 134a & b, 183] 



1887 : Taenia amhlopUtis 



1887: Taenia micropteri 



1896 : Ichthyotaenia amhlopUtis 



1897: Taenia ocellata 



1900 : Proteocephalus amhlopUtis 



1905 : Proteocephalus amhlopitis 



1909 : Proteocephalus sp. 



1911 : Proteocephalus amhlopUtis 



Specific Diagnosis: Characters of the genus. Cestodes large, 280- 

 410 mm. long, 2.-2.5 mm. in maximum breadth. Surface of body rough, 

 with transverse and longitudinal furrows. Scolex prominent, 0.57-0.88 

 mm. broad, divided into quadrants by deep grooves. Tip of scolex 

 usually marked by a minute depression with a slight elevation in the 



