AVIAN CESTODES. 879 
the uterus; but it is, when fully matured, a lobate sac, and 
apparently not strictly cylindrical, as in my species. On the 
other hand, the paruterine organ is represented as appearing first, 
and the course of the vas deferens is as in my species and not as 
in some others. Further, the genital apertures of Rh. numida 
are behind the middle line of the proglottid, and the testes come 
nearer to surrounding the ovary than in other species, except 
Rh. cylindrica. Finally, the generative ducts lie between the 
water-vessels and ventral to the nerve-cord. I have observed 
the same relationship in 2h. cylindrica. 
It is possible, of course, that previous authors have not seen 
quite fully-developed examples of the species studied by them. 
In view, however, of the published figures of the uterus and 
paruterine organ in the several species, | am inclined to doubt 
this. For example, Ransom’s figure of that organ in Rh. similis* 
shows the “ flowing appearance” of the core of the paruterine, 
which I find only in that organ when fully developed (see 
text-fig. 8, p. 872). As to other species, it does not appear 
that the reticular uterus of Rhabdometra cylindrica, a condition 
which precedes its cylindrical final form, has any likeness to 
what has been observed in previously described forms. This, 
indeed, coupled with the form of the paruterine organ and a 
number of minor points, such as the posterior position of the 
generative apertures, the position of the coil of the vas deferens, 
and the distribution of the testes, seem perhaps after all to 
necessitate generic separation. But this I leave for the present. 
It must be remembered, however, that the scolex of this species 
of Ransom is unknown, and that apart from this character it 
is hard to distinguish habdometra from Paruterina. 
§ A Note upon Otiditenia eupodotidis Leddard. 
After communicating to the Society f my note upon this new 
tapeworm from Haupodotis kori, it was suggested to me that it 
was possibly identical with or near to a recently described new 
genus and species Sphyroncotenia uncinata. I had not at that 
time seen Mr. Ransom’s paper =, which only (through his kindness) 
reached my hands after my memoir was in the press. I was, 
therefore, unable to make any comparisons. A consideration of 
the structure of this genus Sphyroncotenia, leads me to revise 
what I have written concerning the affinities of Oliditenia ; but 
the two genera are not identical. In Sphyroncotenia the body 
is much more elongate than in Otiditenia; the genital pores are 
unilateral; there are many rows of minute hooks upon the 
rostellum, and the uterus appears to be racemose and to extend 
* Loc. cit. p. 35, fig. 26. 
+ P. Z.S. 1912, p. 194. 
+ Ransom, “A New Cestode from an African Bustard,” Proc. U.S. Nat. Mus. 
bra a DN 7s Yeu coo 
