121 



Genui CeratopAry*. 



'>'.)'.) The skeleton of a large specie* of homed Toad (Ceraiopkry*). 



Tin- boors of the tkull have a rough, granulated, rxtrrior surface. The diapoplivMti of 

 the atlas are compressed and truncated at their extremities ; thoae of the fourth, fifth and 

 ixth vertebnr are subcyliudrical aud elongated; thote of the aacrum are long, strong, 

 depreated and expanded. The coccygeal ftjle haa a simplr, anchyloaed, neural canal. 

 There is a semi-ossified tubercle upon the proximal extremity of each iliac boue , these arr 

 confluent at their distal extremities with each other aud with the ischimn. The lniin.ru. 

 present* a long deltoid ridge, but tho*c which extend to the outer and inner comlyles an 

 almost obsolete. All the bones of the mouth are edentulous, but a trenchant ridge i 



developed from the lower pan of each palatine. 



Purchased. 



600. The natural skeleton of a small species of Toad with rough cranial bones like 



the Ceratopkryt, but in which the neural arches of the six vertebrae betwirn 

 the axis and sacrum present a smooth concavity or depression above, instead 

 of a spine. Purchated. 



Genus Pipa. 



601. The skeleton of the Surinam Toad (Pipa motutrosa). 



This species presents eight Tertebne from the atlas to the sacrum inclusive, and the coccy- 

 geal style is anchyloaed to the sacrum : it would seem that the first vertebra answered to 

 both atlas and axis, as in the ordinary Toads and Frogs, since it is longer than the succeeding 

 one*, and devclopes a long diapophysis on each side. The vertebne of this toad are united 

 by ball-and-socket joints, but the ball is anterior instead of being posterior, as in the ordinary 

 Toads and Frogs. The diapophyses of the second and third vertebrae are of unusual length, 

 and support semi-ossified, short, flattened pleunuwphyscs. The diapophyses of the four suc- 

 ceeding vertebrae are very short and slender ; those of the sacrum have the form of depressed, 

 remarkably expanded, triangular plates, and rest upon the anterior halves of the iliac bones. 

 The inpraarspiils is bifurcate, its anterior and longer branch resting upon the diafiophysis of 

 the atlas. The acromial ridge of the scapula has coalesced with the long and slender clavicle. 

 The coracoid* remain distinct, and are unusually expanded beneath the thorax. The tibia is 

 shorter than the femur. A calcaneal sesamoid is developed in the extensor tendon of the 

 foot. The long tarsal bone representing the coalesced body of the cakmneum and cuboid, is 

 three-aided, the angles forming sharp ridges. The astragalus presents a similar form. 



