Plate XLI. 



Monograph- O TSTER-IJ^'D USTR Y. 



FiK. M. 



Fig. 55. 



KifT. 5G. 



ri''. 58. 



FiL'. GO. 



"-■V* 



r ifT. 51). 



FifT. Gl. 



FiK. 53. 



Fi-. G-2. 



Fi-. G3. 



Fijr. G4. 



Fig. 65. 



Fig. 6«. 



Figures of tbe egg of the oyster anil tlie young oyster in progressive stages of growtb. illustrating tbe studies of Dr. W. K Brooks. 



[Frum the report of T. B. Ferguson, commissiouei of flsberica for ilarylaud.) 



