210 PROCEEDINGS OF THE ACADEMY OF [1880. 



H. spinosns Edw. 



Heterograpsus spinosus Edw., Ann. Sci. Nat., Ill, xx. p. 194 (1853). 



Vanikoro (Edw.) ; Australia (A. M.-Edw. 



Genus ERIOCHEIR De Haan (1835). 



Carapax quadrate, antero-lateral margin two-toothed. Front 

 much less than half the width of the carapax. Antennulffi 

 oblique. Antennae not excluded from the orbit. External 

 maxillipeds nearly closing. Meros as long as broad, the external 

 distal angle not expanded and the carpus articulating with the 

 middle of its anterior border. 



Synopsis of Species. 

 Sides convex. 



Mesial frontal lobes rounded. japonkus. 



Frontal lobes acute. sinensis. 



Sides straight. rectus. 



E. japonicus De Haan. 



Eriocheir japonicus De Haan, op. cit., p. 59, PI. XVII (1835). 



Carapax nearly flat, surface uneven. Front four-lobed, mesial 

 lobes rounded, outer lobes acute ; protogastric lobes prominent, 

 granulate. Antero-lateral border two-toothed, with indications of 

 a third. Meros of chelipeds with the margins granulate, the 

 posterior terminating in an acute tooth. Carpus with a promi- 

 nent internal spine ; distal margin of the carpus and external 

 surface of the hand with thickly set long hair ; the inner surface 

 of the palm with a short horizontal line of granules. Fingers 

 sub-excavate. Ambulatory feet hairj^ above. 



Japan! (no donor's name). 

 E. sinensis. 



EriocJieirlxsl sinensis Edw., Ann. Sci. Nat., Ill, xx, p. 177 (1853). 

 Arch, du Mus., vii, p. 146, PI. IX, f. 1 (1854). 



G?dna (Edw.). 

 E. rectus. 



Eriocheir rectus Stirapson, Proc. Acad. Nat, Sci. Phila., 1858 p. 103. 



Macao (Stimpson). 



Genus PERIGRAPSUS Heller, 1862. 



Carapax convex, sides arcuate, with one tooth behind the angle 

 of the orbit. Front narrower than half the width of the carapax. 

 Meros of the external maxilliped a little longer than broad and 

 beai'ing the palpus on the external angle. Dactyli of ambulatory 

 feet spined. 



