No. 447-] HA MINE A SULITARIA SAY. ' 225 



laying period extends from the middle of June to the last of 

 August during which time the adults migrate from the deep 

 water into shallow ponds and lagoons. The eggs are laid in a 

 gelatinous mass, spherical in form, attached to eel grass, algai, 

 stones, sticks, etc. The eggs pass from the one celled stage to 

 the free swimming embryo in seven days. The method of seg- 

 mentation of Haminca solitana is in close agreement with the 

 other mollusca. No positive results were obtained from attempts 

 to produce abnormal segmentation. 



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