30 



PROCEEDINGS OF THE 



Fig. 1. 



Series of Successive Types of Elasiiiobraiich Fislies. A. CladoscUiche, typically 

 Devonian, with lins supported by simple parallel rods of cartilage, the 

 paired fins merely balancers (after Dean). B. Pieiiracaiifhua, typically 

 I'eriiio-Carboniferoiis, with paired fins as paddies (after Frifsch). 

 C Hi/hodus, typically Jurassic, witli paired fins for swininiing, persistent 

 notochijrd, and simple vertebral arches. D. Chlanu/rJosclachc, now exist- 

 ing, exemplifying the Cretaceous and Tertiary type, with cartilages pressed 

 between the neurals and ha^mals, and the supports of the fins more or 

 less irregularly subdivided (after Garman). 



