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b. Finger-tips calcareous : left cheliped 

 vastly the larger ; — 



a. Rostrum replaced by a movable 

 scale or spine (a process from 

 the ophthalmic somite) lying 

 between the eyestalks „ Diogenes. 



b No movable rostral scale ; — 



a. Antennal flagellum and left 

 hand bare ; chelipeds and 

 legs of porcellanous tex- 

 ture and often brilliantly 

 variegated ... ... Calcinus. 



/3. Antennal flagellum and left 



hand thickly setose ... Troglopagurus. 



y. B. — Holopagurus, Holmes (Synopsis of Californian Stalk-eyed Crustacea, in Occasional 

 Papers of the Californian Academy of Sciences, VII., 1900, p. 153, seems to be an 

 Isochdes in which the left cheliped is larger than the right. 



Stratiotes, Thomson (Trans, and Proc. New-Zealand Inst., Vol. XXXI., 1898, pp. 171 

 and 185), may perhaps be identical with Troglopagums. 



Gryllopagurus, Zietz (Trans, Roy. Soc. S. Australia, X (1887), 1888, p. 298), is identical 

 with Cancellus. 



Section II. EupaguriN/E: the external maxillipeds are widely separated at base by a 

 sternum, etc. 



A. Fingers opening and closing obliquely: vas deferens not 



protruding : — 



1. A pair of appendages on the first and second abdominal 

 segments of the male only : — 



i. Gills trichobranchiae (quadriserial) _ Parapagurus, 



ii. Gills phyllobranchia: (biserial) : — 



a. Rostrum obsolescent, abdomen spiral ... Svmpagurus. 



b. Rostrum prominent, abdomen straight _ TyUspis. 



II. A pair of appendages on the first abdominal segment 

 of the feiiiiile only : — 



i. Gills eleven on either side ... ... Pylopagurus. 



ii. Gills thirteen on either side ... ... Pylopaguropsis. 



B. Fingers opening and closing horizontally : — 



1. Vas deferens not protruding in the form of a tube : — 

 I. A pair of appendages on the first and second 

 abdominal segments of the m<ile only : 

 abdomen . raight and ending in a perfectly 

 symmetrical shield _ ... Xylopagurus. 



4 



