GRUSTACEA—SYSTEMATIG REVIEW 



295 



Oijmothoidea, hermaphrodite, some living free, others parasitic on fishes : Cymothoa, 

 Anilocra, Cirolana, Kcrocila, Aega, ahnost exclusively marine forms. Sjjhcero^nidce, 

 free living, mostly marine, Sphmroma. Pranizick^, free in the sea, the 3 anterior 



Fig. 198.— Caprella acutifrons, after 

 P. Mayer. A, male from the side ; B, from 

 the hack, ai, Anterior, a2, posterior an- 

 tenna ; &2) ^3) &6j ^7) &8> 2d. to Sth thoracic 

 feet, the 2d moved on to the throat; &r, 

 gills in the place of the 4th and 5th thor- 

 acic feet; cth+I-\-II\ cephalo-thorax=head 

 +lst and 2d thoracic segments ; III-VIIJ, 

 free thoracic segments; ah, truncated 

 abdomen. 



Fig. 199.— Diastylis stygia, male (after 

 G. O. Sars). ai, Anterior, a^, posterior 

 antenna; cfh, cephalo-thoracic shield ; IV- 

 VIII, free thoracic segments ; abi-ab;, ab- 

 dominal segments ; pi, 1st pleopod ; pg, 6th 

 pleopod ; en, endopodite ; ex, exopodite. 



thoracic segments fused with the head. Anceidce, female jiarasitic, male free-living, 

 Aticeus. Idotheidce, free living, principally marine, Idothea. Asellidce : Asellus, 

 fresh water. Oniscidce, on land : Oniscus, Porcellio. The divisions of the Bopyridce- 



