20 PROCEEDINGS OF THE NATIONAL MUSEUM. tol. 05. 



edge on the margin of the strobila. The segments are dense owing 

 to their thickness and the abundance of calcareous corpuscles. The 

 genital papillae are in the middle of the segments and are prominent. 

 The longitudinal excretory vessels are sinuous and are 500 to 700 \>. 

 from the margin of the strobila on each side. 



Male genitalia. — The cirrus pouch is short (fig. 22), extending 

 about half the distance from the lateral margin of the segment to 

 the longitudinal canals and so perhaps (?) 250 to 350 \i. long. It 

 opens anterior of the vagina. 



Female genitalia. — The vagina extends m a straight line from the 

 genital pore toward the median line. The lateral branches of the 

 uterus are small, numerous, and perpendicular to the median stem. 

 They do not extend across the longitudinal ex- 

 cretory canals. The eggs are round and 35 to 38 ^. 

 in diameter. 



Host. — Primary: Canis familiaris. Secondary: 

 Unknown. 



Location. — In intestine of primary host. 

 Locality. — Eritrea. 

 Life history. — Unknown. 

 ^m^^REGi^oiroFTENi- Setti states that this species does not present a 

 TALPORE. DiAGKAM- true rostcllum, but does bear the customary double 

 MATic. AFTEE setti. ^^^^^^ ^f j^^^j^^^ rj.^^ rostcllum Is thc distinct mus- 

 cular bulb which provides the musculature for the 

 movement of the hooks and of the apical sucker when this is present. 

 Inasmuch as the efficiency of the hooks depends on their musculature, 

 it seems inconceivable that a tapeworm should have a well-developed 

 and functional crown of hooks and not have a rostellum. I have 

 therefore modified Setti's statement, which seems to be based on a 

 misunderstanding or misstatement of some sort, substituting the 

 statement that the rostellum is not strongly developed. Other fea- 

 tures of the description have been taken from Setti's illustrations, in- 

 cluding the shape of the hooks and the apparent length of the 

 cirrus pouch. 



It is likely that this tapeworm, like Taenia halaniceps, is only acci- 

 dentally parasitic in the dog, and that its usual host is some wild 

 carnivore. Dogs are such common subjects of investigation for para- 

 sites the world over that while it is possible to overlook a dog tape- 

 worm, as happened in the case of T'aenia ovis, it is nevertheless mi- 

 likely that T. h7^auni is a customary parasite that has been overlooked. 

 Kailliet and Henry (1915) state that the hooks in this tapeworm 

 resemble those of the genus Multiceps. This is true, but the structure 

 of the vp.gina differs from that which I have found in known species 

 of the genus Multiceps, in that it does not present a reflexed loop 

 near the longitudinal canals. 



