Xo. 522] 



THE CANADIAN OYSTER 



or lines and very thin edges— the whole oyster being thin 

 and fitting so solidly against the supporting shell as to 

 require some force with a knife-blade to separate it. In 

 some of the larger was to be seen a tendency to turn 

 white, in that the dark rays were irregularly separated 

 by reversed lighter radiations. Sizes but little larger 

 than these may be found later in the spring and in the 

 early summer. The spat of the oyster-fishermen, varying 

 mostly over one inch in length, are abundant, many bar- 

 rels of which are collected by the Indians at Earn Island 

 Point and thrown out off Lennox Island, the Indian 

 reserve, for further growth. 



Important results added to those given in the preced- 

 ing part on the larva are : 



19. First systematic use of plankton nets in the pro- 

 curing of oyster larva?. 



20. First undoubted recognition of the larva of the 

 oyster in Canada. 



21. Stages hitherto unobserved (constituting the blank 

 referred to by Jackson) may be taken in the plankton net. 



22. The first undoubted recognition of young stages 

 of Canadian oyster spat. 



23. The spatting period has been limited. 



24. The free-swimming period of life of the larva 

 been limited. 



25. Size is a more useful criterion than age. 



26. Sections have been prepared of both larvae and 

 spat in order to determine accuracy of structure. 



27. The gills have been carefully studied. 



28. The intestinal system has been described through- 

 out. 



29. Development has been followed up to adult sizes. 



30. Many structural or other observations have been 

 made, which to enumerate would be largely to rew r" 

 foregoing pages. 



