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peoceedings of the [June, 1856- 



W. Ravenel's description of a new species of J3aptisia, re- 

 commend the same for publication in the Proceedings. 



Monograph of the Genus Cryptopodia. By L. R. Gibbes. 

 Description. — Carapax moderately convex, sub-triangular, broader than 

 long, this great breadth due to a lateral prolongation of the carapax, more or 

 less lamellar ; this prolongation conceals behind the insertion of the abdo- 

 men, and on the sides conceals entirely the four last pair of feet when fold- 

 ed, and allows but the terminal joints of them to be seen when they are 

 extended. Rostrum semi-oval or triangular, nearly horizontal, prominent, 

 upper surface plane, and prolonged backwards on the carapax, for about 

 one-third the length of the latter, and bounded laterally by ridges; from the 

 posterior boundary of this surface, a ridge on each side, more or less dis- 

 tinctly marked, runs to the latero-posterior angles of the carapax, dividing 

 the rest of the carapax into three portions, two latero-anterior, and one pos- 

 terior. 



Eyes small and retractile. Internal antenna, folding longitudinally with 

 slight inclination outwards. External antenncE. with three basal segments, 

 and a short filament of few segments ; the third basal segment reaches the 

 front and the filament lies in the internal canthus of the orbit. Epistoma 

 broader than long. External maxillipeds, with third segment sub-quadrate, 

 having articulation with the fourth at its intero-anterior angle. 



Anterior feet very long, sub-prismatic, transverse section triangular, hand 

 about as long as the carapax, moveable finger, when closed on the fixed one, 

 nearly at a right angle to the axis of the hand. Posterior feet, compressed, 

 concealed by the lateral expansion of the carapax, when folded. Abdomen 

 of seven articulations in male and female. 



Remarks. — This genus was founded by M. Edwards in 1844, in his His- 

 toire Naturelle des Crustaces, (tome L, p. 360) on the Cancer fornicalus of 

 Fabricius ; the discovery of a new species of the genus requires the revision, 

 given above, of the generic characters. Two species are now known, one 

 from the Indian Ocean and coasts of Hindostan, and one from the Southern 

 Atlantic Coast of the North American States. Their description follows : 



1. Cryptopodia fornicata. 

 Synontmes. — Cancer fornicatus, Fabricius, Species Insectorum, t. ii., ap- 

 pend, p. 502* 1781. 

 Cancer fornicatus, Herbst, Nalurgeschichte der Krabben, 



B. I. s. 204, tab. xiii., fig. '79-80. 1790. 

 Cancer fornicatus, Fabricius, Entomologia Systematica, t. ii. 



p.453.f 1793. 

 Parthenope fornicata, Fabricius, Supplem., p. 352.f 1798. 



*Quoted from Herbst. I have never seen the work. 

 tQuoted from M. Edwards. I have never seen the work. 



