238 



BOPYRID.E. 



ISOPODA. 



NOiaiALIA. 



BOPYRID^E. 



-=-^/^^ 



V - f p ^ ) 



PHRYXUS rUSTICAUDATUS. 



Female. — Oval, nearly symmetrical, the segments of the pereion clearly 

 indicated by lateral incisions; antenna, prominently seen beyond the fore 

 margin of the head ; pereiopoda swollen, with indistinct segments terminated 

 by a small claw with a minute dactylos. Pleon well defined, composed of 

 four segments narrower than those of the pereion, and furnished at the 

 sides with four elongate-clavate simple lobes ; terminal segment forming an 

 elongate-oval mass. 



Length, one-tenth of an inch. 



The small but increasing size of the few specimens of 

 this species which we have hitherto seen, all of which are 

 females, their symmetrical form, and the want of develop- 

 ment of the scales in which the eggs are enveloped, lead us 

 to suppose that the individuals before us are not yet arrived 

 at the full growth. The curious lateral appendages at the 

 sides of the tail are more strongly developed than in any 

 other species we have yet seen, and their number agrees 

 with that of the same organs in Ph. Hippolytes. 



