43O BENJAMIN H. GRAVE. 



V. 9/2. 4 females spawned in quantity, 2 maximum, 2 one half maximum. 

 5 males shed sperm, 3 heavy and 2 light. 9 did not spawn. 



* September 5, full moon. 



VI. 9/5. 6 females shed eggs, 4 of them maximum. 5 males shed sperm, 



3 abundantly and 2 light. 4 did not spawn. 



VII. 9/6. 6 females spawned, 4 maximum, 2 one half maximum. 5 males 

 shed sperm, none maximum, mostly light. 8 did not spawn. 



Note. -This cessation or reduction of spawning in August is typical as shown 

 by five years' experience. Spawning is also regularly revived in September. It 

 is most marked when full moon falls during the first week of the month; and less 

 marked when it is near the middle of the month. This record for 1922 led the 

 writer to study these phenomena in detail in succeeding years. They can scarcely 

 be explained on any other ground than a lunar cycle effect. 



SPAWNING EXPERIMENTS. 1924. 



CUMINGIA TELLINOIDES. 



Table No. II. 



* July 2, new moon. 



I. 7/5. 6 females spawned well (maximum). 5 males shed well (maximum). 



One did not spawn. 

 II. 7/8. 4 females spawned well (maximum). 5 males shed well (maximum). 



3 did not spawn. 



* July o, first quarter. 



III. 7/9. 100 per cent, spawned. 3 females spawned, 2 heavy, one light. 



4 males shed, 2 heavy, 2 light. 



Remark. Heavy spawning activity during the past week and nearly 90 per cent. 



of the individuals spawning approximately maximum quantity. 

 IV. 7/12. i female spawned small amount 1/2 maximum. 4 males spawned, 



1/2 maximum. 10 did not spawn. 

 V. 7/14. 6 females spawned, one heavy, 2 medium and 3 light. 9 males 



spawned, one heavy, 4 medium, 4 light. 10 did not spawn after hours. 



Comment. Light spawning activity compared with ten days ago which was 

 remarkably heavy. Tendency to spawn reluctantly, some individuals spawning 

 only after hours. One spawned after two hours, others slow to act. Only one 

 good lot of eggs from twenty-five individuals, and none on July 12. 



* July 16, full moon. 



VI. 7/19. 4 females shed, 2 maximum, 2 light. 5 males shed, 3 maximum, 

 2 light. 6 did not spawn. 



Comment. Impression of light or medium spawning activity. 



* July 23, third quarter. 



VII. 7/2.S. 12 females shed, 5 maximum, 3 medium, 4 light. 7 males shed. 



Some very heavy, some light. 5 did not spawn. 

 Comment. Impression of heavy spawning activity. 



VIII. 7/31. 7 females shed, 4 heavy, one medium, 2 very light. 7 males shed, 



5 heavy, 2 light. 2 did not spawn. 



Comment. Impression of heavy spawning activity, but not quite as heavy as 

 at last new moon. 



