151] PROTEOCEPHALIDAE—LA RUE 151 



PROTEOCEPHALUS PERPLEXUS La Rue 



[Figs. 17, 64, 65] 



? 1886 : Taenia fiUcollis Leidy, 1886 :62-63. 



1911 : Proteocephahis perplexus La Rue, 1911 :478-479. 



Specific Diagnosis: The characters of the genus. Observed length 

 as much as 15.5 cm. Maximum breadth 1.7 mm. Strobilation evident. 

 Angles of proglottids sharp and distinct. First proglottids much broader 

 than long. Mature proglottids broader than long, 1.70 mm. broad by 

 0.595 mm. long. Ripe proglottids quadrate or longer than broad, 1.02 

 mm. broad by 1.10 mm. long to 1.75 mm. long by 0.510 mm. broad. 

 Head somewhat spheroidal, flattened dorsoventrally, divided into four 

 quadrants by grooves extending nearly to the apex. At apex frequently 

 a small papilla situated in a small depression. Head 0.663-0.714 mm. 

 broad, 0.425-0.510 mm. long. Suckers four, 0.340-0.459 mm. long by 

 0.255-0.272 mm. broad. Cavity of sucker deep. No fifth sucker, no 

 rostellum. Neck broad and thick, about 0.5 mm. long. 



Genital pore marginal, situated at end of first fourth or half of 

 proglottid, irregularly alternating. No genital papilla. Cirrus-pouch 

 elongated oval in shape, 0.30-0.344 mm. long, extending %-i/4-% across 

 the proglottid. Ductus ejaculatorius with 1-3 coils. Cirrus when pro- 

 truded spindle-shaped, slender, thicker at base, 0.60 mm. long. Testes 

 135-155 in number, in one layer occupying dorsal field between vitellaria 

 anterior to ovary. Testes 0.069 by 0.037 mm. in diameter. Vagina 

 anterior to cirrus-pouch, never crossing same, beginning region dilated. 

 Inner surface of vagina heavily ciliated. Vitellaria follicular, volumi- 

 nous, follicles of same large, compacted. Portion of vitellaria parallel- 

 ling posterior margin of proglottid. Ovarian lobes thick, heavy, irreg- 

 ular. Uterus, when developed, possessing 20-25 lateral pouches. Ute- 

 rine pores 2-4. Uterine eggs provided with three membranes. Inner 

 and outer membranes thin, second thick, granular, sometimes partially 

 or wholly split into two layers. Embryos 0.013-0.014 mm. by 0.014- 

 0.0156 mm., second membrane 0.019-0.030 mm., outer membrane 0.024- 

 0.036 mm. in diameter. 



Habitat : In intestine of host. 



