640 



MR. F. E. BEDDARD ON 



to the present species, in spite of the fact that it may prove 

 ultimately to be identical with Bei-iiella melanocephala. 



In any case, I shall be arlding some further facts to the general 

 anatomy of the genus b}' the following account of this form. 



Text-fig. 151. 



Sertiella cercopitJieei, nat. size. 

 A few of the posterior segments are shown more higlily magnified. 



The head is rather narrower than the ensuing body, in which 

 the proglottides are evident from the very first, there being thus no 

 neck. In the two specimens which I have examined, the suckers 

 presented diflferent conditions. In one they were apparently 



