GAMMARIDEA. 373 



Plate 59, &g. la, animal, enlarged; b', b", different views of 

 mandible; b'", molar prominence of mandible; c, inner maxilla; d, 

 a maxilla of second pair ; e, maxillipeds ; /, part of flagellum of inferior 

 antenna?, much enlarged; g, hand of second pair of feet. 



Bay of Islands, New Zealand. 



Length, half an inch. The flagellum of the inferior antenna* 

 has about fourteen joints, and is very slender, the last joint of 

 basal part is about one-fourth longer than the next preceding. The 

 first pair of feet has similar hands to the second, though more than 

 half smaller. The hand of the second pair has the apex prolonged 

 and narrow; and, therefore, the joint appears to be abruptly narrowed 

 where this apical prolongation begins, and has a transverse margin 

 at the narrowing. The finger is applied against this transverse 

 margin, being articulated apparently at its outer extremity, where 

 there are a few very minute setae. The mandible has the molar pro- 

 minence transversely ribbed. 



0. tenuis, Dana, Proc. Amer. Acad. Sci., ii. 202. 



Orchestia sylvicola. 



Feminge : — Epimerce mediocres, 6tce ktis vix breviores. Antennce 2dce 

 tenues, dimidii corporis longitudine; flagello longiore quam basis, 

 articulis oblongis, setis verticillatis paulo numerosis, articulo parce bre- 

 vioribus. Antennce lmce basi 2darum dimidio breviores, flagello 6-7- 

 articidato. Pedes 4 antici debiles; 2di paulo majores, nianu oblongd, 

 subellipticd, antrorsum inflexd, apicem rotundatd, digito minuto, ad 

 marginem versus medium affixo, longitudinali. Pedes 4 sequentes 

 subcequi, ungue parvulo. Pedes 6 ultimi paxdo incequi, setis brevibus, 

 his articuli 5ti in marginibus ambobus inter se cequis, utroque margine 

 pedis Imi paribus setarum ferine sex, articulo primo pedum btorum 

 oblongo, Imorum latissimo. Styli caudales ramo externo paris Imi 

 non nudo. 



Female: — Epimerals of moderate size, fifth hardly shorter than fourth. 

 Inferior antennse slender, about half as long as body, flagellum 



219 



