CB USTA CEA SYSTEM A TIC RE VIE W 



295 



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

 Anilocra, Cirolana, Ncrocila, Aega, almost exclusively marine forms. Sphccro '</". 

 free living, mostly marine, Sphccroma. Pranizidoe, free in the sea, the 3 anterior 



Fio. 198. Caprella acutifrons, after 

 P. Mayer. .4, male from the side ; B, from 

 the back, aj, Anterior, a*, posterior an- 

 tenna ; fcoj &3> &6> 67, *>8i 2( 1 to Sth thoracic 

 feet, the 2d moved on to the throat; br, 

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

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

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

 free thoracic segments; ab, truncated 

 abdomen. 



FIG. 199. Diastylis stygia, male (after 

 G. O. Sars). oj, Anterior, a, posterior 

 antenna; cth, cephalo-thoracic shield ; II'- 

 VIII, free thoracic segments ; abj-a&y, ab- 

 dominal segments ; j)j, 1st pleopod ; p$, 6th 

 pleopod ; en, endopodite ; ex, exopodite. 



thoracic segments fused with the head. Anccidce, female parasitic, male free-living, 

 Anceus. Idotheidce, free living, principally marine, Idothea. Asellidcc : Asellvs, 

 fresh water. Oniscidce, on land ; Oniscus, Porcellio. The divisions of the Bopyri<ln 



