a2 BULLETIN: MUSEUM OF COMPARATIVE ZOOLOGY. 
Meganyctiphanes norvegica ‘ . ; ; : : . 
Euthemisto compressa . 119 
Clione limacina 119 
Limacina balea 120 
Salpae 121 
Tomopteris hdlgdianiivs a 121 
Chaetognaths 121 
Medusae 123 
Siphonophores 125 | 
Ctenophores 126 
Results of the quantitative baw ls 127 
Microplankton ; : : : : : ‘ : . « - 180 
Table of stations , : ; ; ; : ; A ; co. Joe 
Table of temperatures : * : ‘ ‘ ; oy Eee 
Table of salinities 137 
Table of densities ; ' 141 
Table of current measurements ; ‘ ‘ ‘ , ‘ . 148 
145 
Bibliography ' 
Explanation of plates. 
THE CRUISE. 
Dvurine July and August 1912 the U. S. Fisheries Schooner GramM- 
pus was detailed for an oceanographic cruise in the Gulf of Maine, 
under my direction, the purpose being to make as nearly complete 
a survey of the temperatures, salinities, currents, and plankton, of the 
waters of the Gulf as the brief time at our disposal, and the limitations 
incident to the use of a sailing vessel would allow, (Bigelow, 1913). 
It was also planned to do some systematic trawling in the neighbor- 
hood of Casco Bay, in cooperation with the Harpswell Marine Lab- 
oratory. During the cruise I was accompanied by Messrs. W. W. 
Welsh and Herbert E. Metcalf as assistants. It is a pleasure to ac- 
knowledge the assistance which Dr. C. O. Esterly has afforded in the 
preparation of this report, by identifying the copepods in more than 
60 samples of plankton, no small task. And the value of the dis- 
cussion of the plankton (p. 98) is largely due to his efforts, for copepods 
were altogether its most important constituent. A like debt of thanks 
is due to Mr. E. L. Michael, who has identified many of the Sagittae 
(p. 121), and to Mr. W. W. Welsh, who supplied the lists of fish fry 
and adult fishes (p. 107). I am also indebted to Capt. John W. McFar- 
land, of Gloucester, who made several “tows” from his Schooner 
VicTor. 
