104 TRANSACTIONS LIVERPOOL BIOLOGICAL SOCIETY. 



received. They were adherent by their suckers and hooks 

 to the piece of liver, and two of them had excavated 

 cavities in the tissue. I tried to kill one in fresh water, 

 then in sea water containing cocaine, but without success. 

 One specimen was preserved in Zenker's fluid and serial 

 sections were made and stained with Mann's methyl- 

 blue eosm. The rest were preserved in weak formalin. 

 Fixation and staining were quite satisfactory. 



The appearance of the Cestode when alive is repre- 

 sented in fig. 2, PL I, about natural size. It varied 

 from 30 to 60 mm. in length, according to the degree 

 of contraction, for it was very mobile. When fully 

 extended it was quite smooth, without wrinkles or 

 furrows, a slight constriction marked off the anterior 

 "cephalic" part from the body, which tapered to a 

 blunt-pointed " tail " extremity. When contracted after 

 killing, the whole body was irregularly segmented by 

 rather deep constrictions, and a short terminal portion — 

 the "appendix" of Lonnberg — was retracted into a socket 

 or sheath. In this condition the worm is figured by 

 the latter author, who also gives an account of its 

 morphology. I am, however, able to add some details of 

 structure, and these ma}^ be worth recording since 

 Lonnberg' s paper is not easily accessible. At any rate, 

 the Cestode is so rare that confirmation of the already 

 published account may be desirable. 



The Scolex. In life the scolex is quite smooth, but 

 after fixation it is marked by a great number of 

 longitudinal, shallow furrows (Text-fig. 1). There are 

 two bothridia, "dorsal" and "ventral" in position, 

 and each of these structures is an elongated suctorial 

 organ like the sucker of a Bothi'iocephalus . Its wall 

 consists of dense parenchymal tissue, with relatively few 

 muscle fibres. A slight ridge runs longitudinally along 



