Plate XXXIX. 



Monograph- O YSTKR- LAD VSTJi J ", 



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Fijr. ;!7. 



rij.. 3D. 



fS. on. v\\l ] ■« 



V\". 4(1. 



Fid. 41. 



Fig. 42. 



Figures of the egg of the oyster anil the yniiiig oyster in jirogressi ve stages of growth, illustrating the studies of Dr. W. K. Brooks. 



[FriMri lliu ii'piirt iif T. B. »rinisiin. cnTiiniiKsiiini'r uf fisheries for MaTvhnd.l 



