48 



SMITHSONIAN MISCELLANEOUS COLLECTIONS VOL, I3I 



Ps-n IMxpd IMx 2Mx Q- 



FiG. 18. — Isopoda: Gnathiidea. Paragnctha formica (Hesse) (from Monod, 



1926) . 



A, first frce-swiinming larva. B, second form of larva parasitic on a fish. 

 C, attitude of feeding larva. D, adult male. E, adult female. F, head of adult 

 male, dorsal. G, section of larval head showing piercing mouth parts. 



Epst, epistome; Md, mandible; iMx, first maxilla; sMx, second maxilla; 

 Mxpd, maxilliped; Pgn, paragnath. 



