Udont 



APODA. 



Order I. APODA. 



89 



Udonella (Johnst.). Body indistinctly ringed ; 

 no front sucker; mouth inferior, longitudinal, 

 toothless ; no eyes ; hind sucker plain. 



A minute parasite on Caligus, which is itself a 

 parasite on the Holibut. 



U. caligorum. Fig. 133 ; mag. 



134 



r\\\ W&v ^ 

 $\\ W^s 



I V\ ^xfc//?] 



139 



HO 



Malacobdella (De Blainv.). Body soft, broad, 

 without distinct rings; no front sucker; no pro- 

 boscis. Transparent parasites on bivalve Mollusca. 



M. grossa. Fig. 134 ; n. s. 



Tristoma (Guv.). Body hard and convex above; 

 soft and flat beneath ; two equal disks in front ; 

 one larger behind. Parasitical on the Sun-fish. 

 T. molee. Fig. 135 ; n. s. 



