124 CRUSTACEA. 



Family I. Pandaridjs. 



Cecrops (Leach). One plate on thorax, small 

 and rounded ; ovaries twisted, and hidden under a 

 shield ; first three pairs of feet in female and all in 

 male tipped with spines, and fitted for walking. 



C. Latreillii (On Sunfish). Fig. 202 ; n. s. 



Lcemargus (Kroyer). Thoracic plate large; feet 

 leaf-like and respiratory. 



L. muricatus (On Sunfish). Fig. 203 ; n.s. 



Pandarus (Leach). Several pairs of thoracic 

 plates ; all the feet armed with hooks, and fitted 

 for walking. (On (Sharks.) 



P. bicolor. Fig. 204 ; n. s. 

 Boscii. 



Dinemoura (Latr.). One pair of thoracic plates ; 

 first three pairs of feet armed with bristles ; the 

 last pair leaf-like and membranous. (On Sharks.) 



D. alata. Fig. 205 ; n. s. 

 lamnse. 



Family II. Caligid^e. 



Trebius (Kroyer). Fourth pair of feet two- 

 branched, fitted for swimming; no suckers on 

 frontal plates. 



T. caudatus (On Skate). Fig. 206 ; f . 



Chalimus (Burmeister) . Fourth feet simple, fitted 

 for walking; frontal plate furnished with a long 

 and slender filament, bearing a sucker at its tip. 



C. scombri (On Mackerel). Fig. 207 ; \°. 



