DEVELOPMENT OF ELASMOBRANCH FISHES. 247 



of these two bodies the suprarenal bodies of the higher Yerte- 

 brata are homologous. This question I shall not attempt to 

 answer in a definite way. My ow^n decided belief is that the 

 suprarenal bodies of Scyllium are homologous wdth the supra- 

 renal bodies of Mammalia, and a good many points both in 

 their structure and position might be urged in favour of this 

 view. In the mean time, however, it appears to me better to 

 wait before expressing a definite opinion till the embr^^onic 

 development of the suprarenal bodies has been worked out in 

 the hiofher Yertebrata. 



