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Group II. Corresponding in the main with Milne Edward's Galathodes. 

 Anterolateral angles of the carapace spiniform, even if the lateral borders are 

 not anteriorly spinose : the distal moiety of the rostrum is acute and styliform, 

 and the proximal moiety is broadened, often carinated, and ends anteriorly in a 

 pair of spines one on each side of the base of the styliform portion, so that the 

 rostrum as a whole is more or less distinctly trifid : chelipeds much longer than 

 the legs and, in the male, as long as or longer than the fully extended body : eyes 

 terminal on movable eyestalks. 



Group III. The extreme forms of which are included in Milne Edward's 

 genus Okophorhynchus. The chelipeds are hardly longer, or are even shorter 

 than the ambulatory legs, and in neither sex are as much as three-fourths the 

 length of the fully extended body. The eyestalks are fixed or hardly movable 

 and are always prolonged beyond the eye as a spine or tooth. 



Group IV. Corresponding in part with Milne Edward's genus Elasmonotus. 

 The lateral borders of the carapace are entire and sulcristiform, and the antero- 

 lateral angles are not spiniform or dentiform : the rostrum is triangular and 

 simple : the chelipeds are much longer than the legs and longer than the fully 

 extended body : the eyes are terminal on movable eyestalks. 



Group V. Bathyankyristes. As Group I., but the propodites of the 2nd, 

 3rd, and 4th pairs of legs are broadened and are armed at or near their distal 

 end with a clump of spines against which the dactylus can be flexed after the 

 fashion of subchelaa. 



Key to the species included in Group I (Munidopsis). 



I. Epipoditea are present on the chelipeds and next 3 pairs of legs ... M. hemingi. 



II. Epipoditea are present on the chelipeds only ... ... ... J|/, dasypus. 



II. No epipoditea on chelipeds or legs : the chelipeds very decidedly longer 

 than the legs : — 



1. Dactyli of the 2nd-4th thoracic legs slender and acutely falcate, 



at least two-thirds the length of the propodites, and with the 



posterior edge sharp and entire ... ... ... M. unguifera. 



2. Dactyli of the 2nd-4th thoracic legs stout, less than two-thirds 



the length of the propodites, of which the posterior border is 

 almost always serrated : — 



i. Posterior border of carapace spinose : — 



a. Rostrum slender, styliform : eyes freely mov- 



ame ••• ••• ... ... M. scobina. 



b. Rostrum triangular: eyes slightly movable, 



embedded in a distinct orbital notch ... M iridis 



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