290 Scientific Intelligence. 



1. Ocnli approximati. Fossce antennales conjimcfce. 

 a. Pedes 8 postici sat graciles, subaeq^ui. 



G. I. PiNNOTHERA, Latr. — Corpus obesura. Carapax superficie 

 integerrimus, nuuquam areolatus. Oculi normales. 



G. 2. Fabia, Dana, — Corpus obesum. Carapax superficie anlica 

 pone orbitas sulura divisus. OcuU normales. 



G. 3. Xenophthal3ius, Wliite.^ — Corpus obesum, fronte incisi- 

 onibus duabus profundis oculos gerenlibus ins'tructo. 



G. 4. Xanthasia, White.f — Corpus depressum, supra fere pla- 

 num margineque elevate utrinque insiructum, fronte paulo pro- 

 ducto. Oculi normales, 



J. Pedes 4ti longiores et multo validiores, 



G. 5. Pinnixa, White.'^ — Corpus portentose transversum. 



2. Oculi sat renioti. fossce antennales sepfo lativscnlo sejunctm. Articulus maxil- 



lipedis exferni 2diisfere dhnidil Ztii lon(jitudin€. 



G. 6. PiNNOTHEEELiA, Lucas,^ — Pedes 8 postici sat graciles, 

 subsequi. Corpus suborbiculare. 



2. HYMENICINiE. Corpus sasplus parce rostratum, depressum, 

 Articulus maxillipedis externi 2dus dimidio 3tii major. 



G. 1. Hymenosoma, Le«c7i, — Carapax suborbiculatus,anguloextra- 



orbitali acute. Frons angustisslmus, non lobatus, oculis valde 

 approximatis. 



G. 2. Halicarcinus, Wkite.\\ — Carapax suborbiculatus, angulo 

 extra-orbitali nullo. Frons tridentatus, antennis inlernis inter 

 dentes se porrigentibus, oculis remotioribus, Articulus maxilli- 

 pedis externi 3tius 2do paulo major. 



G. 3. Hymenicus, Dana.^ — Carapax suborbiculatus, angulo extra- 

 orbilali nullo. Frons productus, simplex aut lobatus, antenna- 

 rum basin celans, oculis remotioribus. Articulus maxillipedis 

 externi Stius 2do paulo major. Pedes gracillimi. 



G. 4. Elamena, Edw. — Carapax subtriangulatus, paulo oblongns, 

 paulo rostratus, fronte antennas internas celante. Articulus 

 maxillipedis externi 3tius 2do minor, 



Fam. VL MYCTIRID^. 



Corpus obesum. Carapax fronte perangustus, orbilis carens; an- 

 tennas internee longitudinales. 



IK 



Genus Myctiris, Latr. 



White, Ann. Mag. Nat. Hist., xviii, 178, and Yoy. of Samaraug, p. 63. I^e 

 genus Fabia forms a transition from Pinnothera to Xenophthalm as ; it includes the 



P. chilensis. 



f Ann. Mag. Nat. Hist., xviii, 176. 



I Ann. Mag. Nat. Hist., xviii, 177. Includes Say's Finn. cyUndricum, Jo^r- ■^^' 

 Nat. Sci, Philad, i, 452. 



Crust of D'Orbigny's S. Amer., p. 24. The genus forms a transition to the 

 Gecarcinidae. 



\ 



A.nn, Mag. Nat. Hist., xviii, 178. 



The genus ffymenosoma belongs to the Cape of Good '. 



xtremity of S. America, and Humenicm to New Zejdan 



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