» F. STOLICZKA^ ON OXYGLOSSUS PUSILLUS 



raaxillaries (m). From the lateral branching of the frontals^ a slig-ht 

 furrow is traceable in the upper view of the occipital bones (fig. 3), 

 running posteriorly near the lateral margins : it disappears afterwards, and 

 two narrow ridges are seen converging posteriorly where the occipital (o) 

 should be placed. The tympanic bones (tm) are thick, thejugal (j) rather 

 thin : they do not appear, so far as they are seen, to differ from the 

 corresponding bones in the recent species of Ranida. 



The lower jaw ^fig. ^, IJ consists of a narrow bone without teeth, 

 nor is there any trace of vomerine teeth observable. The absence of 

 these is the chief distinction between Oxyglosms and Rana. 



3. The vertehral column consists of vertebrae, which are of the usual 

 form, broader than long, with very short neural spines, minute posterior 

 zygapophyses, and the diapophyses of various length. The atlas (no. 1 in 

 fig. 1 or cd in fig, 3) has, as usually, no diapophysis, but is laterally rather 

 sharply pointed j the diapophyses of the third vertebrae are longer than 

 any of the others, although very slightly longer than those of the 

 second : those of the fifth vertebra are subequal to the fourth. The 

 diapophyses of the succeeding vertebrae rapidly shorten, being nearly of 

 equal length, — about equal to one-half of those of the third vertebra. 

 The sacral vertebra is prolonged into a strong coccygeal style (co), slightly 

 expanded a little below its junction with the sacral vertebra, and then 

 gradually narrowing posteriorly ; it appears to have had a sharp 

 ridge above, and its length equals two -thirds of that of the ver- 

 tebral column. The diapophyses of the last vertebrae are club-shaped, 

 considerably thicker externally where the ilia (il) join. These are two 

 long, laterally compressed bones of about equal thickness, very slightly 

 bent externally, posteriorly united to the ischia, which project a little 

 behind (i). At the junction of the iliac and ischiac bones, the former 

 are slightly thicker, but the joints for the femora do not project 

 laterally. 



3. Anterior extremities and their appendages. — The total length of 

 the anterior extremity is three-fifths of that of the body, the length 

 of this being almost equal to that of the humerus, the anchylosed ulna 

 ( 3bS ) 



