ISOPOD8 OF NORTH AMEKICA. 



567 



All seven pairs of legs present. Pleopods wanting and replaced by 

 fleshy ridges. Uropoda wanting. Male with all the segments of the 

 thorax distinct. Segments of abdomen fused. Pleopoda wanting. 

 Uropoda absent. 



Branchial parasites. 



BOPYROIDES HIPPOLYTES (Kr^yer). 



Bopyruft hippolytes KR0YER, Kongelige Danske Videnskabenes Selskabs natur- 

 videnskabelige og mathematiske Afhandlinger, VII, 1838, p. 306, (78), pi. 

 iv, fig. 22. EDWARDS, Hist. Nat. des Crust., Ill, 1840, p. 283. KR0YER, 

 Kongelige Danske Videnskabenes Selskabs naturvidenskabelige og mathe- 

 matiske Afhandlinger, IX, 1842, p. 262; Voy. en Scand., Crust., 1849, pi. 

 xxvni, fig. 2. STIMPSON, Proc. Acad. Nat. Sci., Phila., 1863, p. 140. 



FIG. 628. BOPYROIDES HIPPOLYTES (AFTER SARS). a, FIRST INCUBATORY PLATE. 6, PALP OF MAX- 

 ILLIPED. c, MAXILLIPED. d, HEAD OF MALE (VENTRAL VIEW), e, ANTERIOR PART OF SPECIMEN OF 



SPIRONTOCARIS POLARIS INFESTED WITH THIS PARASITE. /, LEG. g, ANTERIOR PART OF HEAD OF 

 FEMALE (VENTRAL VIEW), h, DORSAL VIEW OF FEMALE. I, VENTRAL VIEW OF FEMALE, j, DORSAL 

 VIEW OF MALE. 



