13 



last joint of the fifth pair of feet broadly oval, rounded at the 

 extremity, instead of lanceolate and acute ; the basal joint of the 

 antennute advanced and visible in a dorsal view between the 

 frontal teeth ; the chelipeds elongate ; the abdomen of the male 

 oblong instead of narrow triangular. 



OvALiPES TRiMACULATL'S (dc Haan). 



1833. Anisopus trimacnlaia, de Haan, Crust- Japonica, decas i,. 



p. 13 



1834. Platyoiiichus bipiistnlatus, Milne-Edwards, Hist. Nat, 

 Crust., vol. I, p. 437, pi 17, fig. 7-IO- 



1838. Anisopus irimaculatns, M'Leay, Illustrations Zool. South 



Africa, p. 62. 

 1843. Anisopus trimaculatus, Krauss, die siidafrik. Crustaceen, 



p. 2y. 

 The Anisopus of de Haan was instituted as a subgenus of 

 Corystcs, and to it he assigned in 1833 his own species punctata 

 and irimaculata, with the addition of ocellaia, Herbst, doubtfully. 

 To the name fn'inaculataw sp. he subjoined "(SebaT. xviii,fig. 

 9). Dr. Horstok a littore Promontorii Bonae Spei." That the 

 specimen forwarded to me from the Cape belongs to de Haan's 

 species trimaculata is beyond question, but the proper name for it 

 may be debated. In 1834 Milne-Edwards described his Platyoni- 

 chns bipustulafus, from the Indian Ocean, and the figure of this in 

 bif (undated) At'as shows it to be identical with de Haan's tri- 

 macidata. In i835deHaan,decas 2,p 44 (pi. 2, tig. i,l;j describes 

 Corystes (Anisopus) punctata, n. sp-, and adds a note that Platyoni- 

 chus bipustulatiis, Milne-Edwards, appears to agree with the other 

 species of this subgenus, which Horstok had procured at the Cape, 

 and which was distinguished from C. punctata by shorter frontal 

 and blunter lateral teeth, by having the thorax marked behind 

 with two blood-red spots, the hands reddening on the inner side^ 

 tlie thorax and chelae yellow scarcely rubro-punctate or granu- 

 late. That he speaks of only two spots on the carapace of his 

 trimaculate species is due to the fact that the arcuate middle spot 

 is common both to this and punctata. In his index, p. 233, he 

 mentions/z^//6-/a/c/ alone, not naming- either trimaculata or bipus- 

 tulatiis. Miersin iSyband i886gives as ^yrvoxvyxxi^oi P.bypustu- 

 laius, Anisopus punctatus, de Haan, Platyonychus purpureus, Dana, 

 and Portunus catharus. White. Haswell, in his Catalogue of 

 Australian Malacostraca, 1882, does the same, except that he 

 does not give the reference to White- It may be questioned 

 whether the distinctions drawn by de Haan, depending chiefly on- 

 colour markings, are of specific value. It may also be questioned 

 whether the character implied in the specific name, apart from- 



