L^MARGUS. 321 



Gen. 178. CECROPS, Leach. 



Plate-like appendage small and rounded. The male has 

 all the feet, and the female only the first three pair, adapted 

 for walking, and armed at the tips with short, stout spines. 

 The oviferous tubes are very long and slender, and are 

 twisted on each other in numerous loops, and lie concealed 

 in the hollow space between the abdomen and the large, 

 buckler-shaped, last segment of the thorax. 



Cecrops Latkeillii, Leach. — Of a pale horn-colour ; 

 front edge of carapace deeply notched \ the plate-like ap- 

 pendage and last thoracic segment of the body less deeply 

 notched ; hooks at end of foot-jaws deep black. Length of 

 female, an inch ; of male, about the third of an inch. 



Pound on the gills of the sunfish, occasionally caught on 

 the coasts of England and Ireland. 



Gen. 179. LJEMARGUS, Kroyer. 

 Plate-like appendage of considerable size ; the feet are all 

 foliaceous and branchial ; upper segments of thorax distinct 

 and small ; males, as in last genus, much smaller than the 

 females. 



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