158 Rathbnii — Revlsioii of Nomenclature of the Brachyiira. 



be considered the type. Halimus, Milne Edwards, 1834, con- 

 tained two species, aries and auritm. The latter was already the 

 type of Naxia Leach in Latreille, 1825, and the former the type 

 of Halimus Latreille, 1829. Auritus, on the contrary, has up to 

 this time been held the type of Halimus, aries having been put 

 in Hyastcnus White, 1847, which genus now becomes a synonym 

 of Halimus. Halimus, it should be noted, was proposed by La- 

 treille, in 1825, for '' deux especes de la collection du Jardin du 

 Roi, et dont I'une paroit etre tres-voisine du Cancer superciocisus 

 '[superciliosus'] de Linne." As this is not sufficient to define the 

 genus, the name must be considered as a nomen nudum, at least 

 until its description in 1829. 



Platynnichus Latreille, Nouv. Diet. Hist. Nat., XXVIl, 4, 1818, 

 was offered as a substitute for Portu mnus, ihe orthography of the 

 latter name being considered too near that of Portunus; conse- 

 quently Platyonichus must have tlie same type as Portmnnus, viz., 

 P. latipes (Pennant, 1777). If Portumnus be restored, as it has 

 been by many writers, Platyonichus becomes a synonym of it, and 

 cannot be used for the s})ecies ocellatus, as this species was not 

 known to Platyonichus until 1825 (Latreille, in Encyc. Meth., 

 Entom., X, 151). Xaiva, of JNIacLeay, 1838, is available for ocel- 

 latus and its allies, the earlier Anisopus de Haan, 1833, being pre- 

 occupied by Meigen (Illig. Mag., II, 1803) for Diptera. 



Slenoryachus Lamarck, 1818, was a name given to two species, 

 S. phalangium and S. seticornis Latreille. The former was already 

 a member of Macropodia, 1814. The second species is therefore 

 the type of Stenoryachus. It is said to be ecjuivalent to Cancer 

 seticornis Herbst, 1788, which is congeneric, if not conspecific, 

 with Cancer Sagittarius FaV)ricius, 1793. Stenorynchus has always 

 been considered synonymous with Macropodia. 



2. The name of a composite genus tenable for one or more of its 

 species which do not belong in older genera. — -Platypodia is a name 

 given by Bell, Trans. Zool. Soc. London, 1, 336, 1835, to that group 

 of species included by Milne Edwards, 1834, under Cancer. This 

 last genus as defined by Milne Edwards contained none of the 

 Linnsean species of Cancer, and therefore the propriety of Bell's 

 action would not be questioned, except for the fact that previous 

 to the publication of Milne Edwards's Cancer, four of the species 

 contained tlierein had been assigned by de Haan, 1833, to Ater- 

 r/aii-s'and three other species to Actmi. Milne Edwards does not 

 specif}^ the type of Cancer, but in illustration of the genus figures 



