229] PROTEOCEPHALIDAE—LA RUE 229 



prominent hence the worm has the appearance of a continuous ribbon. 

 The description thus far is based on the original description as given by 

 Parona (1898:8-9). In the toto preparations which the writer has 

 studied there were a few mature proglottids one of which is delineated 

 (Fig. 108). The uterus of this proglottid contained a few eggs but 

 these have been omitted in the drawing. This segment measured 1.7 

 mm. long by 0.9 mm. broad. It was thin and flat but considerably 

 thicker than proglottids of an equal state of development from 0. per- 

 spicua or 0. natter -er. 



A genital pore is situated near the middle of the margin of each 

 proglottid. It alternates irregularly from left to right. There is no 

 genital papilla nor is the pore marked by a deep depression as is some- 

 times the case in 0. grandis. The vagina and cirrus-pouch open very 

 near each other but in this toto preparation it was impossible to tell 

 whether there was a common genital sinus. If present at all it was very 

 shallow. The other drawings (Figs. 106, 107) do not show such a 

 structure. 



Testes (Fig. 108) are 100-108 in number. Their dimensions are 

 0.063 by 0.027 mm. to 0.080 by 0.027 mm., the long axis being perpen- 

 dicular to the long axis of the worm. They are arranged in narrow 

 bands situated well away from the vitellaria. In this respect the species 

 resembles O. calmettei. None of the testes are posterior to the ovaries 

 though Parona 's drawing which has been reproduced (Fig. 193) for 

 purposes of comparison shows them there. The vas deferens (Fig. 108) 

 forms a small mass of coils in the mid-region of the proglottid. "Within 

 the cirrus-pouch is the much coiled ductus ejaculatorius (Fig. 107). 

 The ductus passes over into the thicker-walled and more muscular cirrus. 

 When under certain conditions the cirrus is protruded the greater part 

 of the ductus ejaculatorius is crowded out into the dilated basal part 

 of the cirrus (Figs. 106, 107). In this condition the cirrus is very 

 similar to that described and figured by Schwarz (1908) for O. maren- 

 zelleri. He, however, claimed that the whole cirrus-pouch was evagi- 

 nated. In this he misinterpreted the facts for only the cirrus and a 

 part of the ductus are pushed out. Schwarz 's drawing (reproduced Fig. 

 199) shows the cirrus-pouch in its normal position. In O. marenzelleri 

 the distal half of the evaginated cirrus is filiform. This condition has 

 not been seen in the present species yet it seems highly probable that a 

 part of the coils of the ductus can be pushed through the basal part of 

 the cirrus and thus form a filiform cirrus. Unless this be the case it is 

 difficult to understand how copulation can be possible. The large 

 number of coils of ductus ejaculatorius in this species furnishes a dif- 

 ferentiating character between this species and O. marenzelleri. The 



