64 CEYLON PEAEL OYSTER REPORT. 



gv. V, first gnathopod, showing the marsupial plate; prp. 5', terminal part of fifth peraeopod ; 

 wrp.', the uropods. 

 B. Gnathia insolita, n. sp. re.s., lines indicating natural size of specimen figured in dorsal view ; 

 C, cephalic region, showing the muscles belonging to the mandibles; PL, pleon in dorsal view, 

 with rudimentary seventh segment of person ; a.s., a.L, first and second antennae ; m., mxp., a 

 mandible and the maxillipeds ; r/n. 1, 2, first and second gnathopods ; pip. 1, pip., first pleopod, and 

 one of the following pairs. 



All the details are magnified to the same scale. 



