CANADIAN FisHEliIKH EXPEDITION, 19tJrl5 



467 



The distribution in July-August is represented in fig. 9. The large individuals 

 (those above 20mm. in length are represented by vertical lines) are more restricted 

 to the deeper parts of the coastal water, and in the northern part of the gulf they are 

 few in number or altogether lackin.g even in the deep water. We again see 

 them abundant off the mouth of the Laurentian channel on the southern 

 side, at Acadia station 70, indicating the presence there of coastal water, tliat 



Fig. 9— Distribution of S. dcfiium, .Tiily-August 1915. Horizontal line.s indicate individuals under 

 20 mm. in length and vertical lines those over 20 min. 



has doubtless come from inside Banquereau. Tlie absence of large individuals 

 on the banks where warmer water conditions prevail than in the spring- 

 is important. The small individuals (represented by horizontal, lines) are 

 generally present over the whole of the continental shelf, and pass out with the coastal 

 water from the mouth of the Laurentian channel. In two places they are absent, and 

 for different reasons. In Northumberland straits there were none, perhaps because 

 this area is too far from the places where the adults occur. In the Bay of Fundy. 

 among 156 specimens there was only one individual under 18mm. in length, and that 



6551—34 



