680 explanation of the piatbs. 



Plate XLIX. 

 Kg. A. PMlyra reetangularis,^^ , X 5. a, outer mazillipede. 



B. PseudopJiih/ra polita, (J, x3|. 6, postabdomen, x3|; b', 



outer maxillipede. 



C. Cymopolia whitei, adult J , x 3. c, postabdomen, x 4. 



Plate L. 



Fig. A. Dromidia spongiosa, var. stimpsonii, adult 5 , X 2. a, outer 

 view of cbelipede, x 2|. 



B., Homalodromia coppingeri, adult $ , X 4. 6, inferior view 

 of tbe frontal, antennal, and part of the buccal region, 

 showing the form of the epistoma, the nearly smooth en- 

 dostome, &c. ; 5', part of the sternal surface, showing the 

 sternal tubercles ; b", outer view of chelipede. X 7. 



Plate LI. 



Fig. A. Munida edwardsi, adult tJ , X 4. a, dactylus of an am- 

 bulatory leg. 



B. Frontal and antennal region of Pontonia brevirostris, c?. 

 dorsal view, showing the form of the smfJl rostrum, the 

 peduncular joints of the antennules, &c. 6, terminal 

 segment and uropoda ; 6', outer maxillipede ; b", cheli- 

 pede of the first pair ; 6'", chelipede of the second pair ; 

 b"", ambulatory leg (next after ehelipedes), showing the 

 form of the dactylus. 



Plate III, 



Fig. A. Penceus richfersi, (J, x3. a, dorsal view of the frontal 

 and antennal region, showing the form of the eye-peduncles 

 and antennules and antennal scales ; a', terminal seg- 

 ment and uropoda. 



B. Oonodactylws elegans, $, x3. b, lateral view of the 

 raptorial limb (second maxillipe4e), X 3|. 



