SEA-FISHERIES LABORATORY. 273 



A notable difference from the descriptions of either 

 of the above specimens is the absence of coronal hooks. 

 In both E. typus and E. afjine there are two groups of 

 long, slightly-curved hooks on the two mnscnlar lobes of 

 the scolex. In my specimen no trace of these was seen. 

 I think it probable, however, that these spines, or hooks, 

 have been lost in detaching the cestode from the walls of 

 the intestine. Very distinct indications of a musculature 

 which might easily serve for producing movements of 

 the coronal spines are visible. 



The neck is long and the spines there are well shown. 

 Four longitudinal rows can be seen when the worm is 

 slightly flattened out. These spines differ slightly, 

 however, from the figures of van Beneden,* or Wagener.t 

 The summit of each hook (Fig. 10 ) is triradiate, these 

 transverse pieces being bent or slightly twisted. The 

 shaft of the spine itself is very slightly curved. 



Calliobothrium eschrichtii, van Beneden. 



From Mustelus vulgaris, Llandudno Bay, 1906. 

 A small male Mustelus examined had numerous 

 cestodes on the walls of the spiral valve. Each strobila 

 was about 8 mm. to 1 cm. in total length and consisted 

 of comparatively few (about half-a-dozen) proglottides. 

 In addition to these strobilae there were very many 

 detached proglottides in the lumen of the large bowel, 

 most of which belonged presumably to the cestode referred 

 to here. Measurements are: — 



Length of strobila : 8 mm. to 10 mm. 



Length of terminal proglottis : about 3*5 mm. 



Length of first distinct proglottis : 0*6 mm. 



Length of scolex : 12 mm. 



Breadth of scolex : 1 mm. 



Greatest length of hooks : 0'08 mm. 



Mem. sur les Vers Intestinaux, 1858 ; pi. 19. 

 f See Bronn's Thier-reich, Bd. 4, 1 B, Taf. xl., fig. 1. 

 T 



