106 Transactions of the Royal Canadian Institute 



taken were 7 mm. Evidently the spawning season in the Gulf was 

 not continued beyond the middle of June. This sudden disappearance 

 of the eggs coincided with an abrupt decrease in the numbers of the 

 adults taken in the vertical haul with the larger net. The numbers of 

 adults for the different weeks up to and including June 13 were 20, 5, 8 and 

 5 respectively. On June 20 a single one was taken, and after that date 

 none at all. That the adults had not entirely disappeared is evidenced 

 by the fact that on August 23 of the same year a deep tow made below 

 55 metres depth yielded 10 large Sagittae from 21 to 35 mm. long. 

 Nearly all of these had well developed ovaries. It seems probable that 

 spawning is not so limited in time in the Gulf as the results given in 

 Table II would indicate. This view is, corroborated by the finding in the 

 early part of August, 1915, of individuals as small as 5 and 6 mm. in 

 length generally distributed over the Gulf, even in the region where 

 "Prince" station no. 30 is located, and at one place — "Princess" station 

 no. 31 — some as small as 2 and 3 mm. in length (Huntsman, 1919, 

 pp. 459-461). 



In the Bay of Fundy, however, we find a much longer season, (see 

 Table III). As was expected after examining the ovaries of the adults, 

 eggs were found in the plankton from April to October. 



Owing to the large numbers in which the eggs are found there, the 

 results from station no. 3 seemed to be best suited for a study of the 

 proportionate numbers of the three developmental stages in the different 

 months. At station no. 30 where the eggs developed normally and the 

 season ended early, the proportion of eggs in stage 3 increased as the 

 season progressed, so the fact that at station no. 3 from April to the end 

 of July the number of eggs in stage 3 was never as large as the number in 

 stage 1, together with the almost complete absence of the young Sagittae, 

 leads to the conclusion that the eggs do not develop properly in the Bay. 

 September was the only month in which stage 3 predominated, and it 

 was also the only month when young Sagittae were found in large numbers. 

 Even then, their numbers do not approach the swarms found in the 

 Gulf in the early summer. 



It is rather curious that in October the number of eggs in the first 

 stages was again much greater than that in the later ones, and the number 

 of young had also fallen off. This may have been due to the onset of 

 cooler weather. The average of the temperatures at the surface and 

 at a depth of 10 metres on each of the dates when tows were made is 

 given in one of the columns of Table III. The abundance of the later 

 embryonic stages and of the young shows a close correlation with the 

 temperature, increasing up to September and then decreasing. 



