THE ISO POD A 217 



including members of the same sub-order, Amphipoda, Euphausiacea, 

 Decapoda). In both groups the par.isitic habit is associated witli 

 the occurrence of hermaphroditism. The Cymothoidae present a 

 series leading from the predatory, actively swimming Cirolaninae, 

 with mouth-parts adapted for biting, to the sedentary Cymothoinae, 

 with suctorial mouth-parts. Some of the Epicaridea (Entoniscidae) 

 become practically endoparasitic, penetrating into the body of the 

 host, although remaining enveloped l)y an invagination of the 



K 



Bathynomus giganteus, dorsal view, about three-sevenths of natural size. 

 (After Alilne-Efiwards and Bouvier.) 



integument. The mode of absorbing nutriment by root -like 

 processes penetrating the body of the host, which is found in 

 the Ehizocephala and some Copepoda, ap2)ears to be adopted by 

 some of the Liriopsidae. 



Some of the smallest Isopoda are found among the Asellota, 

 certain species of which do not exceed H mm. in length when 

 adult. A length of three inches is exceptional in the Order, and 

 Ikdhynomus giganteus (Fig. 131), which reaches nearly eleven inches 



