376 



CRUSTACEA. 



antennarum externarum lmm transversus, apice utrinque productus et 

 subacutus, superficie gramdatus, processu orbitam antennamrpie sejun- 

 gente subtriangulato, trihedrico, non truncato. 



Carapax obese, throughout convex above, anterolateral sides very 

 tumid, without any trace of a margin or angle. First joint of outer 

 antennas transverse, apex either side of next joint prolonged and 

 subacute ; process adjoining (between the base of these antenna? 

 and the orbit), subtriangular, trihedral, not truncate. 



Plate 24, fig. 1, part of carapax, under side, natural size. 



Peacock Island, of the Paumotu Archipelago. 



Length of carapax, three inches ; breadth, three and two-thirds 

 inches; length of the front, between the eyes, twelve lines; same, 

 between the angles of the margin just above the outer antenna\ nine 

 and a half lines ; breadth of buccal area anteriorly, nine lines. The 

 process between the outer antennas and orbits, has the outer side 

 arcuate, the inner excavate, and the outer surface adjoining the inner 

 margin concave. The second joint of the outer antenna 1 is small and 

 polygonal. Upon the surface of the carapax near the front margin, 

 the front of the prasmedial areolet is but slightly indicated. The 

 only specimen of this species saved from among the many collected, is 

 a carapax. 



G. obesum, Dana, Proc. Acad. Nat. Sci. Philad., 1851, v. 252. 



Cardisoma UIRTIPES. 



Carapax longitudinaliter convexus, mar glue latendi ant ice notatus^propc 

 dentem postorbitalem minute apicidato, areola pramediand antice 

 juxta frontem paulo abruptd, regione pterygostomiand pilosd. Pro 

 cessus prceorbitalis orbitam antennamque externum sejungejis trianqu- 

 latus, trihedricus. Articidus antennarum externarum lmus rectan- 

 gulatus, apice recti truncatus. Pedes maris antici crasri, subapii, sat 

 breves, manu punctata, breviore quam latitude carapacis, parte man us 

 ante digitos breviore quam altiore, digitis late Mantibus. Pedes pas- 

 tici hirti. 



