304 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 was 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 
Fic. 72.— Distribution of pteropods and heteropods, July—August, 1913. — 
a, Atlanta; s, Limacina balea; c, Criseis; C, Corolla; r, Firoloida; 1, 
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 Limacina was most abundant can hardly be determined — 
by the open nets which were used, but the fact that the nets whieh 
