98 



BULLETIN OF THE 



DESCRIPTIONS OF FIGUEES. 



LIST OF ABBREVIATIONS. 



The figures of Plates I.-IV. are surface views of eggs by reflected light, each 

 magnified about sixty diameters. 



Fig. 



PLATE I. 



1. An egg showing the primitive cumulus. 



2. A more advanced egg, showing the primitive cumulus, the caudal thick- 



ening (c dn. ca.), and between the two, traces of the forming ventral 

 plate. 



