STALK-EYED CRUSTACEA 361 



/^. Eye-stalks short and stout. Antennae short and 

 thin. Penultimate pair of legs subchelate, last pair 

 chelate. The penultimate ring of the abdomen has an 

 oval calcified plate. — {Xylopagurus.) 



I. Abdomen spirally tzvisted or bcfit abmptly, soft and 

 membranous, the segmentation imperfect. 



A. First and second abdominal segment without genital 

 appendages : — 



I. Calcinus. 



Calcinns Dana, Stimpson, Haswell, 



Henderson. 

 Pagurus H. Milne Edwards. 



Front with a distinct rostral projection. Ocular 

 peduncles usually slender, the basal scales of moderate 

 size, and situated close together. Antennal acicle short ; 

 the flagellum naked. First pair of legs unequal, the left 

 larger ; the fingers moving in a vertical plane, excavated 

 internally, and calcareous at the tips. Second and third 

 pair of legs with short terminal joints. Fourth pair of 

 legs chelate. Males without protruded vas deferens. 

 Surface comparatively smooth, and often highly coloured. 



Range.— West Indies, Pacific. 



Synopsis of the Species. 



A. First pair of legs granular. 



a. The succeeding legs are slightly hairy. ^ — {C. 

 tuberctilosns.) 



B. First pair of legs sniooth. 



b. Penultimate joint of third right leg cylindrical. — 

 {C. tibicen.) 



c. Penultimate joint of third right leg compressed. — 

 {C. S2tlcatus.) 



