y.' 



KNf/ 



( 





Zoology. 131 



G. 3. Valdivia, While.^ — Articulus maxillipedis externi 2dus 

 brevior quam latior, 3tius longlor quam latior. 



G. 4. PoTAMiA, Latr, — Articulus maxillipedls extern! 3tius apice 

 subtriangulatus anguloque apicali 4tum gerens. Palatum colli- 

 culo utrinque bene partilum. 



An hic pertinet genus Galene Haanii ?f 



Legio III. CYCLINEA, vel CANCROIDEA CORYSTIDICA. 



Pedibus maxillipedeque Imo Cancridis affinis. Palatum colliculo 

 utrinque non divisum. Antennae externse obsoletse, Carapax angustus, 

 suborbiculatus. Branchias numero septem. 



G. I. AcANTHocYCLTJS, iwca^.J — Carapax orbiculatus. Pedes lon- 

 gitudine mediocres, larso uncinate. 



G. 2. CoRirsToiDEs, Lucas.^ — Carapax oblongus, ellipticus. Pe- 

 des longlores, tarso styliformi, longo. Antennae internae fossis 

 carentes. 



2. Addiliotial note to the Retnarks on the Classification of the 

 Maioidea; by James D. Dana.||— The following genus by Kroyerlj 

 should be added to the synopsis given in the last number of this Journal. 



< It appears to belong to the subfamily Inachinae, and is classed near 



Inachus by its author. The species on which the genus Is founded is the 

 Cancer phaJangium of Fabricius, Faun. Groenl. n. 214, and his Cancer 

 Opilio in Det danske Vid. SelsL Skr. nye Saml. iii, 180. It is from 

 Vjre^enland, Kroyer gives the following generic characiers: — 



G. Chioncecetes. — Cephalothorax depressus, subtriangularls, eadem 



i 'f^® longitudine ac latitudine, antice truncatus, fronte lata rostroque ho- 



rizontally blfido, brevissimo. Pedes 2di paris duplicem cephalothoracls 



^ |ongitudinem superantes, triplicem vero non attingenies; pedes Iml paris 



I 2dis tertiisque breviores, cephalothorace vero longiores (inlerdum du- 



Plo); chelis acuminatis, falcatis ; pedes 2di, 3iii, Clique paris com- 



pressi^ 5ti paris sub^ylindrici. 3tius pedum maxillarium externorum 

 I articulus fere quadratus eadem pa?ne longitudine ac latitudine; 4tu3 



articulus angulo inlerno lertii adnexus; oculi crassi, in orbilam retrac- 

 / tiles; pars antennarum externarum termlnalis mobilis brevissima. Ab- 



domen sex constat articulis.— The name Chionoecetes is from ^r^w*', nix, 

 and oixr.ir^g^ incoJa. 



Ann. and Mag. Nat. Hist., xx, (1847,) 206. 

 t »ee page 127, Tsrhere it is placed with the Ozinse. The branchial caritj i3 

 jery lar^e, as in Potainia. and contains outside of the branohife a large open 

 space. The shell of a specimen from the Sandwich Ids. closely like the <?, tiataien- 

 l^ 1 *^^*^' ^^ *^^^ appearance of a fresh-water or laud species, the texture being 

 ^ calcareous tlian in most marine species. Tlie specimen was not collcrtofl by 

 nn ti!"*^r' ^*^ -^ ^^ *^^'^^^ habitat i< not known. Kruuss^s species occurred under stones 

 ^nine shores at the mouth of a river in South Africa. 



Crust.D'Orbign.S.Am.29,pl.l5, 



^^t volume of tliis Journal, p. 425. IF Tidsknft, n, 249. 



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