114 TRANSACTIONS LIVERPOOL BIOLOGICAL SOCIETY. 



colleague, Mr. A. Scott, at the Marine Laboratory, Piel, 

 and a single Cestode was found by him. I describe this 

 worm here. It is a Tetrarhynchus which I have not 

 previously seen ; and its measurements are : — 



Length of strobila : 85 mm. 



Length of scolex : 1'92 mm. 



Length of bothridia : 036 mm. 



Breadth of bothridia : 0*42 mm. 



Length of proboscis bulbs, 0*36 mm. 



Length of terminal proglottis, 4'5 mm. 



Breadth of terminal proglottis : 1 mm. 

 The worm is figured below. It is relatively long and 

 slender, more so than any other Tetrarhynchus which I 

 have seen. 



Scolex. 1, fig. 3. There are two bothridia, leaf- 

 shaped, more pointed anteriorly than at the posterior 

 end, where there is a shallow notch, as in the bothridium 

 of T . erinaceus. They project well out from the scolex, 

 and are relatively shallow. The proboscides, four in 

 number, arise from the antero-lateral margins of the 

 bothridia. 



The remainder of the scolex — the "head-stalk" — is 

 rather long, and decreases at first in diameter, swelling 

 out in the region of the proboscis bulbs, and thereafter 

 the diameter of the neck decreases greatly. The bulbs 

 themselves are relatively short. 



These characters correspond fairly well with those of 

 Tetrarhynchus longicollis, and I thought at first that this 

 was the species represented. The armature of the 

 proboscides is, however, quite different, the hooks and 

 spines in each oblique row being different from each 

 other, as in the case of T . erinaceus. They are very 

 difficult to make out, but their general characters and 

 arrangement are represented in Text-fig. 3 (2 and 3). 



