SOME MAMMALIAN TAPEWORMS. 



653 



some 6 inches in length. A very marked characteristic is the 

 fact that the segments are wider than long throughout almost the 

 whole of the body. It is only at the extreme end that they 

 become longer. The segments overlap successively, so that it is 

 possible to detect the anterior margin of each segment. The 

 worm is not very stout, but flattened after the typical Tapeworm 

 fashion ; the most posterior segments alone being rather thicker 

 in a doi'so- ventral direction. The diameter of the body in the 

 middle is some 6 mm. There is no marked colour, thovigh, as will 

 be seen presently, there is some, internal pigmentation. The 

 general character of the segmentation suggests that the pro- 

 glottides are not shed. 



This species like Anoplocephala has no " neck," as it is termed, 

 that is to say, there is no undifferentiated zone following the scolex, 



Text-fig. 157. 



Scolex of Thysanosoma gamhianwm. 



where the limits of the proglottides are unrecognisable. The 

 definite proglottides are obvious from the very first. They are 

 at first rather narrower than they become posteriorly ; but the 

 diameter of the body very soon attains to its full dimensions. 

 Proc. ZooL. Soc— 1911, No. XLYI. 46 



