110 TEAXSACTIOXS LIVERPOOL BIOLOGICAL SOCIETY. 



.neuroglial fibres; traverse this meshwork in various 

 directions, and here and there are nuclei, belonging to 

 the parenchymal tissue. Calcareous corpuscles, and 

 excretory capillaries are also present, but not so much in 

 the ganglionic region as in the more posterior parts. 

 This parenchymal tissue is, no doubt, traversed in all 

 directions by the hypothetical systems of nerve fibrillae 

 which pass out into the bothridial. ])roboscidial and 

 lateral nerve tracts. (jf course, if it were not for the 

 presence of the highly characteristic ganglionic cells one 

 would have great hesitation in describing all this system 

 of parts as nervous. The form, it is true, is that of a 

 central nervous system and I have no doubt that such is 

 its nature. On tlie whole it appears to be simpler than 

 the corresponding series of parts in the Tetrarhynchids 

 described. 



The e.vcretory ctiiuils. These conform in their 

 disposition to that of a true tetrarhynchid scolex. As a 

 rule, however, there arc two main canals on each side of 

 the body : in the specimen described there is only one. 

 The branching and anastomoses of these canals is also 

 similar to the condition in allied forms; a peculiar 

 feature (noted also by Lonnberg) is the presence of very 

 large sinuses in the posterior parts of the body : some of 

 these are represented in fig. 7, PL I. Fine excretory 

 capillaries are present everywhere in the scolex. Of 

 " flame-cells " I have seen no trace. 



Tlie Appetiduv. This is represented (in section) in 

 fig. (i, 1*1. I. It is llie term ilia i . conical cxlrcmity of 

 the body which is capalile of retraciion with in a terminal 

 socket, or pouch, no doubt by the action of the longi- 

 tudinal muscles. It. and the adjacent part of the body 

 consists of a tissue rather different from that forming the 

 rest of the animal— not parenchymal in nature, but 



