EUCHELYS. 447 



Loc. The specimens 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 Carejtta rostratu, somewhat reduced in size ; 

 Figs. 9 & 11, being their profiles. 

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



GENUS EUCHELYS, GIRARD. 



CHAR. GEX. Capite parvo, rotund ato ; rostro obtuse, abbreviate ; max- 

 illis robust i-s, cum marginibw acutis et integris ; apice maxillae infe- 

 rioris recurvato; maxilla superiori antice emarginata. Scutorum 

 frontalium et parietaliurn pari uno; scuto verticis uno; occipitali 

 mediano ampli&simo; scutorum latero-occipitalium paribus duobus, et 

 pari uno postoccipitalium transverse elongatorum. Scutis postocula- 

 ribus quatuor. Scutis mentalibus prcesentibus. Scuto elongato ad 

 maxillae inferioris laterem. Carapace cordiformi, tredecim scutis non 

 imbricatis tecto ; periplieria integra. Sterno sex paribus scutorum 

 medianorum et lateralium quatuor cooperto; scutis postaxiUaribus plu- 

 ribus. Palmif, plantisque umjuibus duobus 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. 



OBSERV. This genus partakes of the characters of both Thalasso- 

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

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



