TiENIA MEDIOCANBLLATA. 



237 



wise, Dr. D. F. Weinland has suggested the generic title of Tcenia- 

 rhynchus. M. Moquin-Tandon was also unwilling that the title ori- 

 ginally given by Kiichenmeister should be retained, because, as he 

 said, it was " badly compounded, one of its roots not being a Latin 

 word." The name, however, is sufficiently correct, and has the 

 advantage, moreover, of referring to an interesting, almost specific, 

 character in connection with the water-vascular system. The 

 worthy discoverer describes it as consisting of a main transverse 

 channel " running through the free space between the four sucking 

 disks ; from this a branch runs to and around the suckers until 



Fig. 50. — Head of Tcenia mediocanellata ; from a specimen prepared by Mr. Frederick Turner. 

 Drawn with the aid of a camera (x 40 diam.)— Original. 



the four well-known longitudinal vessels are developed from them 

 in the neck." These, as in T. solium, are continued downwards 

 on either side near the margins of the segments throughout the 

 entire series, but it would seem that they are not supplied with the 

 well-known transverse (segmental) branches, which characterize 

 the joints of the common tapeworm. 



As regards the mode of development of this hookless flat- 

 headed tapeworm, the recent experimental researches of Leuckart 

 incontestably prove that the *' measles," or cysticerci which pro- 

 duce them, are to be found in the muscles and internal organs 

 of cattle ; and in his valuable work (" Die menschhchen Para- 



