EUCHELYS. 447 



Log. — The specimeDS were procured at the Feejee Islands. How 

 far the species extends over the South Sea has not been ascertained. 



Plate XXX, figs. 8 & 10, represent, each, an upper view of two 

 heads of Garetta rostrata, somewhat reduced in size ; 

 Figs. 9 & 11, being their profiles. 

 Figs. 12 & 13, are upper views of two carapaces. 



Genus EUCHELYS, Girard. 



Char. gen. — Gapite parvo, rotundato ; rostro ohtuso, ahbreviato ; max- 

 illis robustis, cum •marginihus acutis et integris ; apice maxillae infe- 

 rioria recurvato; maxilla superiori antice emarginata. Scutorum 

 frontalium et parietalimn pari una; scuto vei'ticis uno; occipitali 

 mediano amplissimo ; smUorwn latero-occipitaliii'm parihus duohus, et 

 pari uno j^ostoccipitalium transverse elongatorum. Scutis postocida- 

 qHIjics quatuor. Scutis mentalihus prcEsentihus. Scuto elongato ad 

 maxillae inferioris laterem. Garapace cordiformi, tredecini scutis non 

 imhricatis tecto ; peripheria integra. Sterno sex parihus scutorum 

 medianorum et lateralium quatuor cooperto ; scutis postaxillarihus pl%ir 

 rihus. Palmis plantisque unguihus duohus praeditis. 



Gen. Char. — Head small, rounded; snout obtuse and abbreviated ; jaws 

 robust, with a sharp and even margin; lower jaw curved upwards 

 at the tip ; upper jaw somewhat emarginated upon its middle. One 

 pair of frontal plates ; a vertex plate, and one pair of parietals. A 

 middle occipital, very large ; two pairs of latero-occipitals, and one 

 pair of transversely elongated postoccipitals. Four postoculars. 

 Mental shields present. Side of lower jaw with an elongated plate, 

 Carapax cordate, covered with thirteen non-imbricated shields. 

 Periphery even. Plastron with six middle pairs of shields, and 

 four lateral ones; several postaxillar shields. Two claws to either 

 flipper. 



Obsery. — This genus partakes of the characters of both Thalasso- 

 chelys and Ghelonia ; of TJialassochehjs, by the presence of two claws 

 to each hand and foot ; of Ghelonia, by the structure of the head and 



