102 



(^rapsus laniger very nearly related, but not identical species. As to the former 

 species, the auriculate shape of the merus of the external maxillipeds, which peculiar shape is 

 even more strongly pronounced than in Pseudograpsus erythraeus, forbids in my opinion its 

 beino- included in Heterograpsus and points on the contrary to Pseudograpstis. In genuine 

 Ilctcro^rapsiis (or better Drachynohcs) the, external margin of this meriis is regularl)- convex. 

 Dimensions^) in mm. of Pseudograpsus laniger: 



Distance between external orbital angles 7.6 



Distance between tips of anterior epibranchial teeth .... 8.9 



■ Width of front at anterior margin 4.4 



Length of carapace 8.3 



Posterior margin of carapace 3-75 



Length of terminal segment .... 1 1 1.2 



Width at base of terminal segment. .1 1 '■ — 



Length of penultimate segment . . . of abdomen of c? i._ 



Width at base of penultimate segment | ( i-4 



Length of antepenultimate segment. . | ' 0.8 



Brachynotus de Haan. 



1835. Brachynotus de Haan. Fauna Japon., Crust., p. 34. 



1837. Cyclograpsits (part.) H. Milne-Edwards. Hist. nat. Crust., t. 2, p. 79. 



1849. Heterograpsus Lucas. An. art. de I'Algerie, t. i, p. 18. 



1 85 1. Heviigrapsus Dana. Amer. Journ. Sc. (2) v. 12, p. 288. 



185 1. Pseudograpsus (part.). Dana. Proc. Ac. Nat. Sc. Philadelphia, p. 248. 



Die H.AAN founded Brachytiotus (subgenus of Grapsus) on "■ Gonop/ax" sexdcntatiis, 

 described in the beginning of the nineteenth century by Risso -). This Brachynotus was 

 described afterwards by H. Milne-Edwards ^) and by Heller *) under the same name, but 

 HiLGENDORF ^) in 1 88 2 tried to prove, that the type of the genus Brachynotus was identical witJi 

 that of Heterograpstis, which was described by Lucas in 1 849 under the same specific name, and 

 HE Man ") afterwards, by examining the typical specimens of de Haan from the Mediterranean, 

 could confirm this hypothesis. So both generic names being founded on the same species should 

 be considered synonyms. 



The confusion is considerably increased by the fact, that H. Milne-Edwards in 1853 

 added ') a species, '^Heterograpsus sexdentatiis\ from New Zealand to the genus, and accordingly 

 changed the name of Lucas' species into H. lucasi, under which latter designation the Medi- 

 terranean species has been described by Heller*) in 1863. But Hilgendorf ^) is undoubtedly 



1) Measured under the microscope. 



2) Hist. nat. de I'Eur. m6r., t. 5, 1826, p. 13. 



3) Ann. Sc. Nat. (3) t. 18, 1852, p. 161, pi. 4, f. 26. 



4) Crust, d. siidl. Eur., 1863, p. loi — 102. 



5) Sitzungsber. Gesellsch. naturforsch. Freunde Berlin, 1882, p. 68. 



6) Zool. Jahrb., Sjst., Bd 9, 1895, p. 121. 



7) Ann. Sc. Nat. (3) t. 20, 1853, p. 192, pi. 7, f. 7. This is the species, formerly (1837) referred by flie author to Cvi/ei^iafsiis. 



8) Crust, d. sudl. Eur., 1863, p. 105, pi. 3, f. 5 — 6. 



9) Sitzungsber. Gesellsch. naturforsch. Freunde Berlin, 1882, p. 70. 



