BATRACHIA. 



SYNOPSIS OF ORDERS. 



A. Tail present; inferior ]»elvic elements not consolidated 

 into a single vertical mass; j^roximal elements of tarsus not elon- 

 gated; frontals not continent with ])arietals. 



a. Dentaries and premaxillaj without teeth, covered with 

 horny plates; two ethmoids, forming part of palate 

 laterally; maxillaries, prefrontals, palatines, and ptery- 

 goids wanting; nasals present; posterior extremities 



absent; branchire persistent Trackystomata. 



h. Dentaries and ])reniaxilh^ toothed; two vertical ethmoids, 

 one on each side of cerebral lobes; ]~)Osterior extremi- 

 ties present. 



X. Maxillaries, prefrontals, and nasals wanting; ptery- 

 goids and palatines present; branchiai persis- 

 tent Proteida. 



y. Usual cranial bones ])resent; pterygoids and pre- 

 frontals sometimes absent; branchifc wanting 

 when completely developed . . Cadnciljranchiata. 



B. Tail absent in adult; coccyx represented by a single 

 long cyclindrical bone; inferior pelvic elements consolidated into 

 a single vertical mass; proxhnal elements of tarsus much elon- 

 gated; frontals confluent with parietals; ethmoid, a ring usually 

 ossified above, surrounding cerebral lobes; limbs four; body 

 short, depressed Anwra. 



' Order TRACHYSTOMATA. 



Family SIRENID.E. 



Premaxilhe not anchylosed; two groups of vomerine teeth; 

 parasphenoid edentulous; occipital condyles sessile; four persis- 

 tent branchial arches; tongue free in front and on sides; eyes 

 small; eye-lids not well develoj)ed; veitebra' amphic(elian; car- 



