118 
BULLETIN OF THE BUREAU OF FISHERIES 
1913 (Bigelow, 1915, p. 302), whereas in July and August, 1912, we found it only 
in the northwest part of the gulf, on the one hand, and over German Bank, on the 
other (Bigelow, 1914, p. 120). At the same season in 1914 we found no Limacina 
Fig. 44. — Occurrence of the shelled pteropod Limacina retroversa in winter and spring. X, locality records for December, 
1920-January, 1921; ©, February to April, 1920; O. May of 1915 and 1920. The hatched curve incloses its area of 
occurrence in early spring up to May 
off Penobscot Bay, where it had been plentiful during the two summers preceding, 
but towed numbers of them in the northeastern corner of the gulf (stations 10246 
and 10247) not far distant, and likewise in the Eastern Channel, over the northwest 
