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A M P H I B I A. 



Ordo III. Testudines. 



Anitnal tesla immobili, cum costis connata obtectum, tetrapodiim , caudatum, repens vel nalan», ani- 

 malculis, herbis vel fruclibus victitans, mas pene simplici inslructus feminam insidendo fecun- 

 ^ dans, foemina ova numerosa subrotunda membranacea in fossa arenosa ad marls, fluvii vel 



lacus ripam excavata deponens, non incubans; tympano aurium extus conspicuo; maxillis cor- 

 neis edentatis pyxidum instar se claudentibus ; digitis unguiculalis; ventriculo cordis simplici 

 hiauriculato i pulmonibus persistentibus, metamorphosi, uti in ranis, non subjeclis. 



Genus I. hi IVl Y o, 



Fluviatilis vel lacustris testa convcxo - depressa , oblonga; palmis pentadactylis , plantis tetra^ 

 dactylis, utrisque depressis ; digitis elongatis semipalmalis vel palmatis, acute 



unguiculatis ; sterno immobili^ 



Species 1. EMYS AMAZONICA. Tab. I. adulta. Tab. II. Fic. I. 2. pul- 



lus. FiG. 3. ovviui. 



Maxima, magnitudine Chelonis INIydae, brunneo nigricans vel grisea, subtus flavescens; capite squamoso, 

 depresso, antice compresso, brevi, vix adunco, supra inter oculos approximatos sulcato, posti- 

 ce largissimo ; scutello verticali triangulo postice elongalo; gula unicirrhosa; tesla ovata, immar- 

 ginata , postice dilatata, planiuscula ; scutello dorsi marginali anlico Intermedio nullo ; bractea 

 pectoris versus caudam bifurcati pentagona, pone acuminata; pedibus s(juamaiis, large palma- 

 tis, squamis latis aliisque linearibus transversis. 



r\ ♦• ♦ 



JL^escripti o. Caput in enibryonibus flavuin , in verlice nigro - bipvmctatum , in 

 adullis fusco - flavicans , pyramidale, postice largissimum, membrana colli obvolutum , 

 antice compressum, breve, acutum, supra inter oculos approximatos sulcatum, s(jua- 

 mis papyraceis quatuor munitum , quarum verticalis unica , subhexagonali - trigona , 

 oblonga, antice larga, postice angustior; nares membranaceae, rotundae, vix separatae, 

 subsuperae; maxilla superior et inferior corneae, oblicjuae, apice vix aduncae, fla- 

 vescentes, cin-ho in gvxla unico; collum subcrassum, rugosum, breve, flavescens, oc- 

 ciput involvens. Testa maxima, magis ovata , convexo - depressa , in medio adulto- 

 rum dorso planiuscula , antice svibangusta, vix emarginata, vel immarginato - trun- 

 cata, postice largissima mai-gine planiore, in junioribus flavo-virescens dorso conve- 

 xlore subangulato, in adultioribus brunneo nigra sive grisea, subtus flavescens dorso 

 planiore; scuta disci in junioribus punctulato-rugosa, in adultioribus undulato-stri- 



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