288 ^ Scieiitific Intelligence. 



G. 7. Planes, LeacL* — Carapax non lineolatus, Isevis, fere quad- 

 ratus, parce oblongus. Frons rectus. Ariiculus maxillipedis 

 externi 3tius latior qiiam longior, cordatus. Tarsi spi nulls 

 armati. 



G. 8. Hemigrapsus, Dana.f — Carapax non lineolatus, fere Isevis, 

 laleribus plus minusve arcualis. Frons rectus aut rectiusculus, 

 antennis inlernis tranversis. Ariiculus maxillipedis exlerni 3tius 

 fere orbiculato-cordatus. Tarsi inermes. 



G, 9. Cyrtografsits, Dana, — Carapax gibbosus, subhexagonus 

 non lineolatus. Frons sursuai sinuosus, antennis internis obliquis, 

 inplicis frontls insitis. Articuius maxillipedis exlerni 3iius subor- 

 biculalo-cordaius. Tarsi inermes. 



2. SESARMIN^. — Anfennse internse fronte tecte. Ariiculus max- 

 illipedis externi 3lius cosla obliqua in 2dum producla nolatus. 



1, AriiciiJus maxillipedis externi Sfius apice rotundafus. 



G- 1. Sesakma, Say.\ — Carapax quadralus, ssepe partim lineolatus, 

 lateribus rectis, fronte recle prsBrupto. Abdomen maris versus 

 basin sterno contigno vix angustlus. Tarsi s^pe armati. 



G. 2. Sarmatium, Dana. — Carapax subquadratus, laleribus arcu- 

 alis, fronte curvalim declivi. Abdomen maris versus basin 



sterno conliguo vix angustius. Tarsi inermes. 



2. Articuius maxillipedis externi Ztius apice truncatus et scepe excavatiis. 



G. 3. Cyclograpsus, Edw.§ — Carapax laevis, medio planus, ad 

 margines anteriores declivis, lateribus arcuatis, integris. Abdo- 

 men 7naris versus basin sterno conliguo vix angustius. 



G. 4. Chasmagnathus, Dp H.||— Carapax convexus, subquadratus, 

 lateribus arcuatis et aniice emarginalis, fronte curvatim declivi. 

 Oculi breves. Abdomen maris versus basin slerno conliguo 

 parce angustius. 



G. 5. Helice, DeH.^ — Carapax quadratus, lateribus parallelis, 

 rectis. Oculi longiusculi. Abdomen maris versus basin sterno 

 conliguo multo angustius. 



3. PLAGUSIN^, Antennce internee sinubus frontls longitudinalibus 

 apertae, 



G. 1. AcANTHOPus, Dell.** — Corpus valde depressum. Articu- 

 ius maxillipedis externi 3lius oblongus, parvus, apice 2di multo 

 angustior. Ramus maxillipedis Imi internus apice anguslus et 

 not transve 



* M.-?. Mas. Brit. ; the genus is recognized id BoTrdich's ''Madeira and Porto Santo/' 

 p. 151 ; and more lately in Beirs Brit. Crust., p. U:i.~]^antlloqrapms of Edwards, 

 Crust, ii, 89. 



f Grapms (subgenus) of De Haan, F. Jap., p. 31 ; Cyclograpsiis, in part, oi Ed- 

 "wards, Crust, ii, 77. 



X Jour. Acad Nat. Scl, i, 76, 1817. Fachymna, of De Haan, Faun. Japon., p. 33. 

 _ Crust, ii, 77.^Gnathoohasrnus, of JFLeay, Smithes Illust. Zool S. Africa, and 

 Cat. Crust. Brit. Mus. by A. White, 1847, 40. 



I Faun. Japon., p. 27. f Faun. Japon., p. 28. 



** Faun, Japoa, p. 29. Corresponds to Plagusia clavimana. 



