Permian of New Mexico. 



389 



ulated skeleton, reaching nearly to the upper end of the scapula, 

 flattened from side to side above. The cleithrum is small and 

 vestigial, smaller than in Diadecles, a slender, cylindroid bone, 

 reaching quite to the superior anterior angle of the scapula, 

 but not expanded over the end, as in the temnospondyls. It 

 is dilated at its lower end to articulate with the attenuated 

 upper extremity of the clavicle, lying between the clavicle and 

 the front margin of the scapula. It is only a little more than 



Fig. 4. 



Fig. 4. Limnoscelis paludis. Left pectoral girdle, two-fifths natural size, 

 c, cleithrum ; cl, clavicle ; sc, scapula. 





two inches in length. The scapula is very short. The blade 

 above is narrow, thinner and curved outward on its front part, 

 thickened at its posterior superior border. Its upper end is 

 truncated, and doubtless had a supra-scapular, cartilaginous 

 continuation, possibly the representative unossified of the upper 

 end of the cleithrum. The glenoid fossa is deep and large, the 

 stout metacoracoid extending far back relatively. The poste- 

 rior border of the scapula is curved nearly uniformly from the 

 angle to the extremity of the preglenoid facet, which is large 

 and flattened. There is a distinct supra-glenoid fossa a little 

 below the middle of the bone, between the borders, which 

 diverge nearly the middle of the length of the scapula ; it is 

 pierced in the usual temnospondyl way for the passage of the 



Am. Jour. Sci.— Fourth Series, Vol. XXXI, No. 185.— Mat, 1911. 



27 



