87] 



PROTEOCEPHALIDAE — LA RUE 



87 



extending barely through vitellaria. Ratio of length of cirrus-pouch to 

 breadth of proglottid 2 :9 in mature, 1 :5, 1 :6, 1 :7 in ripe proglottids. 

 Ductus ejaculatorius in 1-3 coils. Vas deferens forming a narrow mass 

 extending to middle of proglottid. Testes about 70 in number, in one 

 layer, occupying entire field between vitellaria and anterior to ovary. 

 Diameter of testes 0.085-0.130 mm. Vagina anterior to cirrus-pouch, 

 never crossing the latter. Sphincter vaginae and receptaculum seminis 

 not seen. Lobes of ovary thick, heavy, and long, length of pair 0.510- 

 0.918 mm. Vitellaria coarsely follicular, voluminous, situated farther 

 from margin of proglottid than in most species. Uterus in ripe pro- 

 glottids with 6-8-9-12 lateral pouches on either side. Embryo with 

 three membranes, second membrane 0.037-0.04 mm. in diameter, embryo 

 ovoidal, 0.0212-0.0265 mm. in length. 



Habitat: In intestine of Acerina cernua (Linn.). 



Gmelin (1790:3079) refers to this species in these words: "Taenia 

 cernuae. 79 — T. Pallas clench, zooph. p. 414. Habitat in percae cer- 

 nuae intestinis, vix propria species." The writer has not been able to 

 secure the paper cited by Gmelin so he can not judge as to his descrip- 

 tion if, indeed, he gives one. Zeder (1803 :376) adds nothing descriptive 

 to Gmelin 's data. He remarks, "1st schwerlich eine eigene Art, und 

 gehort zu nro. 42. (Halysis percae mihi)." Evidently the confusion of 

 this species with Proteocephalus percae begins here. Rudolphi (1810: 

 108) considers T. cernuae a synonym of Taenia ocellata Rud. (Vide 

 infra for quotation). 



Von Siebold (1835:83) found Taenia ocellata in Acerina cernua in 

 1834. This reference is from Muhling (1898:37). The writer has not 

 seen von Siebold 's paper. Muhling also states that Liihe in 1893 found 



*Gmelin gave this on the authority of Pallas 1776:414. The writer has not 

 access to this work of Pallas. 



