Fig. 3. — Larva of Oyster, 6 days old. 

 pr., prototroch. m., mouth. sh., shell, oi., otocysts. 



1 



*A) 



Fig. 4. — Date Larva of the Oyster captured by the Surface-net. 

 i'., velum, St., stomach. int., intestine. lie, liver. 



