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bulletin: museum of comparative zoology. 



cina was taken in the depths. On the other hand, most of the Lima- 

 cinas did not come from any very great depth, because whenever two 

 hauls were made, a deeper and a shallower, it was usually the latter 

 which made the largest catch. This w^as the case both south of Cape 

 Cod (Station 10061) and in the Gulf of Maine (Stations 10092, 10093, 

 10097, 10100, 10102) and the only exception (10064) yielded so few 



Fig. 72. — Distribution of pteropod.s and heteropods, July-August, 1913. 

 A, Atlanta; b, Limacina balea; c, Criseis; C, Corolla; f, Firoloida; i, 

 Limacina inflata; p, Pterotrachea. 

 The curve shows the probable southern limit to Limacina balea. 



specimens (4) that no deductions can be drawn from it. The precise 

 depths where Lim acina was most abundant can hardly be determined 

 by the open nets which were used, but the fact that the nets which 



