SEA-FISHERIES LABORATORY, 



115 



The two views are those seen by focussing through the 

 same piece of a proboscis. 



(a) There are two prominent and characteristic 

 spines in each oblique row, (2), which are long and 

 slender, and only slightly curved, and which generally 

 lie across each other. At the base of each of these spines 

 is a much smaller one with a wide slipper-shaped base, 

 and a sharply bent apical portion. 

 / . 2. . 



Fig. 3. Tetrarhynchus benedeni (Crety). 



1. The Scolex and anterior part of " neck " region. 



2. Part of a proboscis. 



3. The same part — the obverse view. 



4. A bothridium seen en face. 



5. The terminal proglottis. 



(b) Opposite to these, on the othei side of the 

 proboscis, is a group of three spines. One of these (3) is 

 rather large, with expanded basal pail, and sharply 

 curved apex. From underneath it there projects a 



