250 [August, 



GENUS PLANES, Leach. 



Planes cyaneus. Pedes octo postici valde compressi, articulis tribus ultimis 

 extus dense villoso-ciliatis. Abdomen maris angusto-triangulatum, duplo 

 longius quam latius, 7-articulatum, articulo 3tio latiore, breviore quam 4tus, 

 ultimo triangulate. 



Lo7ig. 6'" 8"'. II ih. in mari Pacifico, lat. bor. 28, long, orient. 174. 



GENUS HEMIGRAPSUS, Dana. 



Hemigrapsus crassimanus. Carapax subtiliter granulatus, margine antero- 

 laterali leviter 2-emarginato, dentibus brevissimis, rotundatis, etiam emargina- 

 tione Stiit obsoleta. Pedes maris antici crassi, nudi, carpo supra indentato. 

 Pedes sequentes tenues, articulo 3tio supra fere nudo, infra lanoso, reliquis 

 margines plerumque pubescentibus, 5to supra sulcato, tarso gracili. Abdomen 

 maris peiangustum, articulo ultimo anguste elongato. 



Long, carapacis 6i"'; lat. 61"'; long, frontis 2V". Hab. ad insulas 

 " Sandwich." 



Hemigrapsus affinis. H. crassimano ferme affinis. Manus maris crassa, 

 minus tumida, antice paulo compressa, digitis hiantibus. Articulus pedis 

 2di, 3tii, 4tive Stius infra villosus, supra partim pubescens. Pes 5tus articulis 

 4to 5to etoque infra supraque pubescens. Margo carapacis antero-lateralis 

 3-emarginatus, emarginationibus duabus posticis parvulis. 



Long, carapacis 1'". Hab. portu " Rio Negro " Patagoniae. 



GENUS CYRTOGRAPSUS, Dana. 



Cyrtograpsds angulatus. Carapax angulato-gibbosus, granulosus, nudus, 

 margine antero-laterali fere recto, 4-dentato, margine postero-laterali leviter 

 uni-dentato. Pedes maris antici crassi, granulati, manu supra paulo truncata, 

 carpo intus truncate. Pedes 8 postici fere nudi, articulo 5to supra sulcato, tarso 

 sulcato. 



Lo7ig. carapacis 171'"; lat. 21"', long, frontis 6"'. Hab. portu " Rio Negro," 

 Patagoniae. 



SUBFAMILY II. SESARMIN^. 

 GENUS SESARMA, Say. 

 Sesarma obtusifrons. Carapax quadratus, sat transversus, postice paulo 

 angustior, omnino bene granulatus, granulis sparsis, lateraliter nee lineolatus, 

 margine antero-laterali integro, fronte perpendiculari, supra rotundato, margine 

 frontali arcuato. Epistoma granulatum. Pedes antici mediocres, carpo manuque 

 supra granulatis, manu extus laevi, digitis nudis. Pedes postici granulati, 

 articulo 5to brevissime sparsim hirsute, 4to fere nudo. 



Long, carapacis 4"'; lat. ant. 51'", post. AY". Hab. ad insulas *' Sandwich." 



Sesarma obesum. Carapax crassus, quadratus, parce areolatus, postice vix 

 angustior, punctatus, non nitidus, lateribus fere arcuatis, nulla parte acutis, 

 margine antero-laterali integro ; fronte perpendiculari, supra fere recto, infra 

 bene arcuato. Epistoma granulatum. Pedes antici breves, manu brevi, non 

 granulata, superne integrd et brevi. Pedes 8 postici angusti, articulo 4to non 

 hirsuto, 5to sparsim breviter hirsute, tarso breviter hirsute. 



Lotig. carapacis 6'" : lat. 61'". Hab. freto " Balabac." 



