No. 472] ANATOMY OF CRYPTOBRANCHUS 305 



Skeleton of the Appendages 



The Anterior Extremity. — Both pairs of appendages are small 

 and weak, and the two girdles are largely made of cartilage. The 

 shoulder girdle is almost entirely composed of cartilage, and the 

 scapular, which is small, is the only ])art that is bony. 



The sternum (Fig. 9) is so small and is composed of such thin 

 cartilage that it may easily be overlooked in w Imstv disMction. 

 It lies in the usual midventral position, and 

 is overlapped anteriorly for about half of ' 

 its length by the large coracoids, that is to 

 say, the coracoids overlap it on its ventral 



about 2.5 centimeters long and of nearly the i 



same width. It is somewhat shovel-shaped, ^ 



with the rounded edge towards the anterior '"J^r"!;^,!^"''''' "'^ 



(Fig. 9). The ventral aspect is smooth and 



slightly in an antcro-dorsnl diivctiou. Ii is cliiclly l.y this thick- 

 ening that the stcniiim is attaclicd to tlic Ixxlv wall. The edges 

 of tlie stcnnnn thin .»..( so gradually ihat it is diHicilt to dcter- 



'VU- iurarniil., wliici, arr.Uwril.c.l I.n ( )s.ua a^ In-in^ .-.Hiii.nM.l 

 of parts, the procorar-nid. Fi- Id. T. , and the (nra.-.,i<ls 

 (C.) proper, though there i. iintlni.g to .li^tiiigui^h tlie Uso region^ 

 are by far the most cons])icnoiis t'lcinents of the shoulder girdle. 

 They are composed entin^lv of cartilage and, together with the 

 -stenmm, form a complete,' ihough thin .■artilau-inoii. ^hcarh for 

 the ventral side of the thoracic region of the Ixxly. Thc.v ..x.-rlap 



