155 



The niensiueiiu'iits of ihe lai'O'ost of these are:-— 

 Greatest diameter of head : 1'75 mm. ; 

 Total leng-th of strobila : lO'T cm. : 

 Width of widest pro^kittis : ■) mm. ; 

 Length of widest progk)ttis : 17 mm. ; 

 but this worm is obviously incomplete. 



The shape of the head is very characteristic of this 

 species but ideutification is made practically certain if the 

 top of the scolex be shaved off and cleared so as to display 

 the hooks. There is one pair of these on the margin of 

 each bothrium and the two liooks of the pair are connected 

 tog-ether at their bases. 



Fig. 12 shows the scolex from the side and the same 

 seen from the top. 

 Acanthobothrium coronatum, Eudolphi.— ^Fig. 13. 



Hosts : Raid clavatd, Carnarvon Bay, and R. batia, 

 off-shore grounds. 



Most of the specimens of this worm were very small, 

 measuring from 5 mm. to 20 mm. One, however, was 

 much larger, and I give the principal measurements as 

 taken from this specimen. 



Length of head : 118 mm. ; 



Greatest diameter of head : 116 mm. ; 



Length of head and neck : 3-5 mm. ; 



Diameter of hook apparatus at the apices : 

 024 mm. 

 This species is easily recognised by the general shape 

 of the head and the presence of the three large accessory 

 suckers above each bothrium. These accessory suckers 

 are not easily observed in such a view of the head as is 

 represented in fig. V't, but if the latter is propped up in 

 a watch-glass so thav one nuiy look down on it from above 

 their disposition can easily be seen. 



