BRITISH STALK-EYED CRUSTACEA. 



261 



in form, but is gradually extended forward into a powerful 

 rostrum consisting of a double bifurcated spine. The carapace 

 is strongly tuberculated, and the regions are well marked ; it is 

 also armed with sharp and powerful spines, very strongly 

 developed on the margin. The eyes are fixed on stout pe- 

 duncles, protected by strong spines, and the antennae are simple 

 and of moderate length. The first pair of legs are unequal in 

 size, resembling in this respect the Paguridce ; the larger one is 

 robust and powerful. These appendages are from four to five 



_ A->^ r A^A- i ^^-^l^_'V__ A ^ l 



Fig. 2. Diagram showing asymmetrical plates on abdomen of female Lithodes maia. 



inches in length, and both are armed with numerous spines. 

 The next three pairs of legs are tapering and thorny, the 



