234 



BOPYRIDyE. 



ISOPODA. 



NORM ALIA. 



BOPYRID^. 



PHRYXUS ABDOMINALIS. 



Male. — Upper antennae very short, three-jointed; second antennse eight- 

 jointed, gi-adually attenuated to the tip. Olilong, subdepressed, with the 

 pleon produced into a short blunt point. 



Female. — Subglobose, very unsymmetrical, with the pereipoda on one side 

 of the body almost obsolete. Pleon furnished on each side with four large 

 oblong-ovate fleshy lobes ; terminal segment minute. 



Length of male, one-tenth, of female, one-quarter, of an inch. 

 Bopyrus ahdominalis. Kroyer, Natur. hist. Tidsk. iii. p. 102 — , 289, pi. 1, 2 



(1840); Voy. Scandinav. Crust, yl. 29, fig. 1. 

 Phryxus Hippolytes. Rathke, in Nova Acta Acad., Nat. Curios., xx. p. 40, 

 tab. 2. figs. 1—10. White, Pop. Hist. Brit. Crust, 

 fig. 257, pi. xiv. fig. a, male; b, female (1843). 



The male of this species is extremely minute, and is 

 generally to be found partially inmiersed between the folds 

 of the posterior part of the body of the female. The 

 head is transversely ovate, with both pairs of antennae 

 visible in front. 



