169 



water, and perhaps also the subsequent preservation, must 

 depend, to some extent at least, on the condition of 

 nutrition of the worm before death, and this would be 

 greatly influenced by the condition of the host, and, 

 perhaps, also by the nature of the material on which the 

 latter had been feeding. 



Echeneibothrium, sp. — Fig. 21 



A single specimen of a cestode belonging apparently 

 to the above genus was taken from the large intestine of 

 a Raia hatis caught oft the Calf of Man in July, 1905. 



Pig. 21. Echeneibothrium sp. A : the scolex from the side ; B : a 

 single bothrium seen from the sucking face. l\Iag. about 40 dia. 



I at first identified it as Ech. diibium van Beueden, but 

 a more careful examination showed that it could not be 

 this species. In Ech. dubium there are only about a 

 score of proglottides and the last one is about one-third 

 the total length of the strobila. In the worm described 

 here the characters of the strobila and proglottides are 

 rather those of Ech. variahile, to which species indeed the 

 specimen probably belongs. 



