ANATOMY OF VEUTEBRATES. 15 



scales. Teeth rendered complex by undulation and side branches 

 of the converging folds of cement, whence the name of the order. 



Genus Bhombojjhol/s. 

 Lahi/rinthodon. 



Order XIV. BATEACIIIA. 



Endoskeleton ossified ; two occipital condyles ; vomer divided, 

 in most dentigerous ; temporal fossas unroofed ; scajDular arch 

 detached from occiput ; riljs as processes, or short, straight and free ; 

 skin nude, often lubricous. Limits digitate, trisegmental. Intestine 

 without spiral valve, vent posterior to urethra. Embryonal gills, 

 in some retained, in most lost ; with a metamorphosis associating 

 a tail-less body with pulmonary respiration and a heart of two 

 auricles and one ventricle. 



Suborder I. Opiiiomorpha. ' ;,'-'' *-'-''' 



iU-J 



Fam. CceciliadcB. Ex. Cascilia. 



Suborder II. Iciitiiyomoepha. 



Fam. Protekl(e. Ex. Siren, Proteus. i 



Salamandndce. Ex. Newt, Salamander. 



•7 < 



Suborder III. Theeiomoepha. Anura. t-i- ' 



Fam. 1. Aglossa. Ex. Pipa or Surinam Toad. 



2. Ranida. Ex. Frog. 



3. Ihjlidce. Ex. Tree-frog. 



4. Bufonida. Ex. Toad. 



Subclass V. Order XV. ICHTHYOPTERYGIA.' {Exti7ict.) 



Body fish-like, without neck ; limbs natatory, with more than 

 five multiarticulate digits ; vertebraj many, short, biconcave ; no 

 sacrum ; anterior trunk-ribs with bifurcate heads ; an episternum 

 and claT,dcles ; post-orbital and supra-temporal bones ; a foramen 

 parietale ; maxillaries small ; premaxillaries long and large. 

 Teeth confined to maxillary, premaxillary, and premandibular 

 bones, implanted in a common alveolar groove, penetrated by 

 convero-ing folds of cement at the base ; nostrils two, small, near 



' Gr. ichthys, a fish ; ptenjx, a fin. 



