STALK-EYED CRUSTACEA 385 



Synopsis of the Genera. 



A. Terminal appendage on last abdominal segment 

 is in one piece with notched margin. 



a. The covering of the abdomen is membranous ; 

 the central segments of the abdomen have no paired 

 a.ppenda.ges.—{Parapag-i(rus.) 



b. The covering of the abdomen is calcified above, 

 membranous below, except for slight calcified zones on 

 the first to sixth segment ; the six first segments of the 

 abdomen have each a pair of appendages. — {Llixto- 

 pagurus^ 



B. Terminal appendages on last abdominal segment 

 has a transverse joint, and terminates in two hinged flat 

 lobes. 



c. The covering of the abdomen is calcified above, 

 the first to sixth segment calcified below, and membran- 

 ous at the sides ; paired appendages on each first six 

 segments. — {Pylocheles.) 



I. Parapagurus. 



Parapagnrns . S. J. Smith, Henderson, A. Milne 

 Edwards and Bouvier. 



Rostrum is slightly marked. Ocular peduncles of 

 moderate size, rarely dilated at their extremity, and their 

 ophthalmic scales are separated by a considerable interval. 

 The two pairs of antennae are well developed ; the 

 peduncles of the internal antennae exceed the eyes and 

 that of the external antennae by more than the length of 

 the carapace. The first pair of legs of unequal size. The 

 legs are long, and terminate in long fingers. Legs of the 

 fourth pair almost cheliform. 



The abdomen is spiral and membranous. The two 

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