DEVELOPMENT OF ELASMOBRANCH FISHES. 



59 



A nearly corresponds with the longitudinal section represented 

 on PI. III. fig. 4, and B with PL IV. fig. 7. In PL iv. fig. 7, 

 the segmentation cavity has however completely disappeared, 

 while it is still represented as present in the diagTam of the 

 same period. If these diagrams, or better still, the wood-cuts 

 fig, 2 A, B, C (which only differ from those of the Elasmo- 

 branch fish in the smaller amount of food-yolk), be compared 

 with the corresponding ones of Bombinator, fig. 3 A, B, G, 

 they will be found to be in fundamental agreement with them. 

 First let fig. 1 A, or fig. 2 A, or PL ill. fig. 4, be compared 



Fig. 2. 



