h; 1 ITZINGEB, SYSTEMATISCHE ANORDNUNG DEU SCHILDIiRÖTEN. 



Genus III. Hydraspis. 



CharacteT essen tialie: 

 Collum vors utile. Stern um per symphysin metathoraci affixum. Pelvis 

 i in m o bili s. 



C h a r a c ter naturalis: 

 Caput vel depressiusculum , corio ter tum (in Cheljdra) , vel depressum, aut scutellis (in 

 Pelomedusa , Pödocnemide ., Platemyde et Rhinemyde), aut corio (in Hydromedusa , Phry- 

 nope • , Hydraspide s. str. et Tetronyche) tectum. Ingluvies vel papillis distinctis (in Chelydra, 

 Pödocnemide, Phrynope, Platcmyde et Rhinemyde), vel nullis (in Pelomedusa, Hydromedusa, 

 Hydraspide s. str. et Tetronyche) . Nasus aut protractus (in Chelydra et Rhinemyde) / aut prominu- 

 lus (in Pelomedusa , Hydromedusa , Pödocnemide, Phrynope, Platemyde et Hydraspide s. str) ; 

 aut proboscideus (in Tetronyche). Collum versatile, plus minusve granulatum aut verrucosum ; 

 vel elongatum (in Chelydra, Pelomedusa. Pödocnemide, Platemyde et Rhinemyde) , vel longissi- 

 •n um (in Hydromedusa, Phrynope, Hydraspide s. str. et Tetronyche). Thorax vel depressius- 

 culus (in Chelydra) , vel depressus (in Pelomedusa , Hydromedusa, Pödocnemide , Phrynope , Pla- 

 temyde 3 Rhinemyde, Hydraspide s. str. et Tetronyche) , scutis corneis tectus. Meiathorax solidus, 

 limbo osseo. Scuta disci aut tredeeim; vertebralia quinque, costalia utrinque quatuor (in CAe/;Y//Yi!, 

 Pelomedusa, Pödocnemide •, Phrynope , Platemyde , Rhinemyde, Hydraspide s. str. et Tetro- 

 ny die); aut quatuordeeim ; vertebralia sex, costalia utrinque quatuor (in Hydromedusa) . Scu- 

 tella marginalia vel viginti quinque; caudalibus duobus, nuchali distineto (in Chelydra^ Phrynope , 

 Platemyde , Rhinemyde , Hydraspide s. str. et Tetronyche) ; vel viginti quatuor ; caudalibus 

 duobus, nuchali nullo (in Pelomedusa, Hydromedusa et Pödocnemide). Sternum aut scutis 

 ubdominalibus (in Chelydra) , aut pectoralibus abdominalibusque (in Pelomedusa , Hydrome- 

 dusa , Pödocnemide, Phrynope, Platemyde, Rhinemyde, Hydraspide s. str. et Tetro- 

 nyche), per symphysin metathoraci affixum ; vel crueiforme, solidum (in Chelydra) , vel dila- 

 tatum, solidum (in Pelomedusa , Hydromedusa, Pödocnemide, Phrynope, Platcmyde, Rhi- 

 nemyde, Hydraspide s. str. el Tetronyche) . Scuta sterni aut duodeeim; gularibus duobus, 

 scuteilo intergulari nullo (in Chelydra et Tetrony che)-, aut tredeeim; gularibus duobus, scu- 

 tello intergulari distineto (in Pelomedusa, Hydromedusa, Pödocnemide, Phrynope, Platemyde, 

 Rhinemyde et Hydraspide s. Str.). Scuta pectoralia et abdominalia aut irregulariter sita, atque 

 pectoralia cum femoralibus conjuneta (in Chelydra), aut regulariter sita, inter se conjuneta (in 

 Pelomedusa, Hydromedusa, Pödocnemide , Phrynope, Platemyde , PJiiuemyde, Ilydras- 

 pide s. str. et Tetronyche) . Margo thoracis lateralis angulatus. Pelvis immobilis. Fedes vel 

 iioii retractiles , scutellis contiguis (in Chelydra) , vel retractiles ; aut scuteilis contiguis (in 

 Pelomedusa, Hydromedusa, Platemyde, Rhinemyde et Hydraspide s. Str.), aut singulis 

 (in Pödocnemide , Phrynope et Tetronyche) . Digiti aut antipedum unguibus quinque , sceli- 

 dum quatuor (in Chelydra , Hydromedusa, Pödocnemide, Phrynope, Platemyde et Rhine- 

 myde); aut antipedum scelidumque unguibus quinque (in Pelomedusa); aut antipedum sceli- 

 dumque unguibus quatuor (in Hydraspide s. Str. et Tetronyche) . Cauda vel elongata, scu- 

 tellata, cristata (in Chelydra); vel brevis, aut scutellata (in Pelomedusa) , aut verrucosa (in 

 Pödocnemide et Phrynope), integra; vel brevissima, aut scutellata (in Hydromedusa, Plate- 

 myde , Rhinemyde et Hydraspide s. Str.), aut verrucosa (in Tetrony che), integra. 



