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i. Geograpsus lividus (H. Milne-Edwards) subsp. stormt de Man. 



1895. Geograpsus lividus (H. Milne-Edwards) var. stonui de Man. Zool. Jahrb., Syst., Bd 9, 

 p. SS, Bd 10, 1898, pi. 28, f. 18a, c. 



Stat. 64. Tanah Djampea, Flores Sea. 1 cf. 



The specimen, which is Iarger than those measured by de Man, agrees wholly with the 

 description of this author, also with regard to its colour. Both chelipeds are wanting. 



From the typical G. lividus the subspecies is only distinguished by the sharp keel 

 originating from the antero-lateral angles of the buccal cavern being convex, whereas in the 

 typical Atlantic specimens it is straight or slightly sigmoid. 



G. lividus has been also recorded by Miss Rathbun l ) from the Hawaiian Islands, but 

 the subspecies, which has been originally found at Atjeh, inhabits 2 ) likewise the eastern tropical 

 Pacific (Marquesas, etc). 



Dirriensions in mm. : 



Distance between external orbital angles 2S.5 



Breadth of carapace 35-25 



Posterior margin of carapace 11. — 



Breadth of front between eye-stalks 14-75 



Length of carapace 29. — 



Length of meropodite ),,.,.„., i 2=;. — 



„ , , . ,. } of 2»d pair of walking legs < 



Breadth of meropodite ) (12.5 



Length of meropodite ) f A c ,, . , ( 22. — 



11. 5 



Length of meropodite 1 . j 



T1 , t , r ,., > of 3" pair of walking legs < 



Breadth of meropodite J ( 



Comparing these measurements with those of de Man we may state, that in my specimen 

 the posterior margin of the carapace is relatively shorter as compared with the maximum breadth; 

 the length on the oth'er hand is somewhat greater. 



Pachygrapsus Randall. 



' 1839. Pachygrapsus Randall. Proc. Ac. Nat. Sc. Philadelphia, 1839, p. 126. 



From the two preceding genera Pachygrapsus is distinguished by its broader front, that 

 occupies more than half the greatest breadth of the carapace, from Metopograpsus by the 

 antennae not being excluded from the orbit. 



Key to the species : 



1. No tooth behind external orbital angle 2 



One tooth behind external orbital angle 7 



2. Lateral margins of carapace very strongly convergent back- 



ward; external orbital angle acute; transverse folds extending 



across mesogastric region. Propodites of walking legs short P . minutus A. Milne-Edwards 



are stated to be "distinct and nearly straight" (as in the former species), whereas the fissure in the lower orbital border is deep and 

 the meropodites of the last 3 pairs of legs are broader than half their length, which agiec with what is found in the latter form. The 

 distribution agrees with that of the preceding species. 



1) Buil. U. S. Fish Comm. for 1903, v. 23, pit 3, 1906, p. 839. 



2) Rathbun, Mem. Mus. comp. Zool. Harvard Coll., v. 35, n° 2 1907, p. 29. 



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