190 WHEELER. [Vor 1x, 
Thus he omits the double uterus, in my opinion the most 
distinctive character of the group. The posterior acetabulum, 
or sucker, must be dropped as a family character, because it is 
lacking in Syxcelidium, a form too closely allied to Bdelloura 
to be relegated to any other Triclad family. 
In Verrill’s anatomical sketch of Bdelloura candida, 1 would 
criticise a remark on the uterus. At page 123, he says: ‘Each 
one (uterus) is connected with the genital duct by a convoluted 
tube”; and in his Fig. 8, Pl. XLIV, he-clearly depicts this 
structure. When the uteri are much shrunken, their irregular 
edges may perhaps simulate a convoluted tube, but as Verrill 
has not studied sections of the Planarian in question, and as I 
feel quite confident that I have not overlooked this tube lead- 
ing to the “genital duct,’ I doubt its existence, at least in 
Syncelidium. 
April 2, 1893. 
