178 



intestine of Labrax hipus, with which the worm described 

 here appears to be identical. Molin gives no figure, and 

 I am unable to find one anywhere in the literature ; the 

 diagnosis, however, indicates that the worm figured here 

 is most probably Molin's species. 



The diagnosis is : — 



'' Corpus teres, antice truncatum, postice acumina- 

 tum, spinulis minimis densissime armatum ; collum 

 conicum, extremitate anteriori dilatatum; os terminale, 

 amplissimum, imbutiforme, coronula sexdecim aculeorum 

 uiajorum cinctum, apertura circulari; acetabuhim ore 

 miniis, ad colli basim, sphsericum, apertura genitalis 

 bilabiata, ante et ad acetabulum." 



Measurements of the specimen figured: — 



Length : 6'5 mm. ; 



Thickness at ventral sucker : O'o mm. ; 

 Diameter of oral sucker : 0'39 mm. ; 

 Diameter of ventral sucker : 0"3'3 mm. ; 

 Distance apart of centres of the two suckers : 



11 mm. ; 

 Length of oral spines : 0'09 mm. 



In the specimens described here all the characters 

 summarised in Molin's diagnosis can be made out. The 

 coronet of 16 to 17 long straight and stout spines 

 surrounds the mouth, and are inserted on a prominent 

 raised lip. The mouth itself is conical, passing into a 

 short pharynx situated nearly halfway between the two 

 suckers. A little way behind the pharynx the intestine 

 forks, and between the fork and the anterior lip of the 

 ventral sucker the genital aperture is situated. The 

 latter is an elongated slit on the surface of a papilla ; 

 its longest diameter is transverse to the axis of the body. 



