1Ü2 



grapsus 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 

 being included in Heterograpsus and points on the contrary to Pseudograpsus. In genuine 

 Heterograpsus (or better Brachynotus) the external margin of this merus is regularly convex. 



Dimensions l ) in mm. of Pseudograpsus laniger: 



Distance between external orbital angles 



Distance between tips of anterior epibranchial teetl 



Width of front at anterior margin 



Length of carapace 



Postenor margin of carapace . . 



Length of terminal segment . . 



Width at base of terminal segment . 



Length of penultimate segment . . . > of abdomen of rf 



Width at base of penultimate segment 



Length of antepenultimate segment. . 



7.6 



8.9 



4.4 



8-3 



3-75 



1.2 



1. — 



1. — 



1.4 



o.S 



Brachynotus de Haan. 



1S35. Brachynotus de Haan. Fauna Japon., Crust, p. 34. 



1S37. Cyclograpsus (part.) H. Milne-Edwards. Hist. nat. Crust., t. 2, p. 79. 



1849. Heterograpsus Lucas. An. art. de 1'Algérie, t. 1, p. 18. 



185 1. Hemigrapsus Dana. Amer. Journ. Sc. (2) v. 12, p. 288. 



1S51. Pseudograpsus (part.). Dana. Proc. Ac. Nat. Sc. Philadelphia, p. 24S. 



De Haan founded Brachynotus (subgenus of Grapstis) on " Gouop/ax" sexdcutatus, 

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

 described afterwards by H. Milne-Edwards 3 ) and by Heller *) under the same name, but 

 Hilgendorf 5 ) in 1882 tried to prove, that the type of the genus Brachynotus was identical with 

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

 de 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 7 ) a species, " Heterograpsus sexdentatus" , 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 8 ) in 1863. But Hilgendorf") is undoubtedly 



1) Measured under the microscope. 



2) Hist. nat. de 1'Eur. nier., t. 5, 1826, p. 13. 



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



4) Crust. d. siidl. Eur., 1S63, p. 101 — 102. 



5) Sitzungsber. Gesellsch. naturforsch. Freunde Berlin, 1S82, p. 68. 



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



7) Ann. Sc. Nat. (3) t. 20, 1S53, p. 192, pi. 7, f. 7. This is the species, formerly (1837) referred by the author to Cyclograpsus. 



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



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



