49 



species described. All our species come uuder Prof. Cope's suborders 

 Arcifh-a and Firnmternia. Of the first, we have representatives of two 

 families; of the secoud, one family. 



Kf.y to the Families of Salientia. 



A. Clavicles* and coracoids of each side connected by an arched car- 

 tilage ; that of the one side overlapping that of the other, 

 (Areifera. ) 

 a. Upper jaw without teeth ; digits without disks. 



Biofonidce, p. 49, 

 aa. Upper jaw furnished with teeth. 



b. Form frog-like ; toes and fingers with disks. 



Hylklce, p. 52, 



bb. Form toad-like ; digits without disks. Scaphiopodidce, 



AA. Clavicles and coracoids of the one side firmly connected with those 



of the other side by means of a narrow median cartilage, 



{Firmisternia.) 



a. Upper jaw with teeth. Ranidce, p. 64. 



aa. No teeth on upper jaw. Engystomatidce. 



Family VII. BUFONID^. 



Both upper and lower jaws destitute of teeth. Vomerine teeth usually 

 absent. The diapophysis of the sacral vertebrae more or less expanded, 

 Vertebrse procoelous. Ribs none. 



A widely distributed family, containing, according to Cope, fourteen 

 genera, of which we possess only one, Bufo. 



Certain characters are very commonly possessed by the Bufonidce,. 

 Among these are a heavy squat form, short limbs, a rough, warty skin^ 

 and a collection of integumentary glands lying behinh the head,, and 

 known as the paratoids. 



GENUS BUFO, Laurenti. 



Laurenti, 1768, 109, 25; Boulenger, 1882, 27, 281; Cope, 1889, 51,. 

 260. 



iSTo vomerine teeth. Tympanum distinct or hidden. Toes webbed ;. 

 fingers free. Sacral diapophysis more or less dilated. Outer metatarsals 

 united. 



'■'In order to understand the arrangements of the shoulder girdle on which the divisiors 

 of the Salientia into Arcifera and Firmisternia is based, the student ought to dissect this por- 

 tion of the common Toad, as a representative of the Arcifera, and the same portion of th& 

 Leopard Frog, as an example of the Firmisternia. The accompanying figures, 7 and 8, pi. 2, 

 will assist. 



4 



