150 BULLETIN OF THE BUREAU OF FISHERIES 
be seen darting about in the water around the Fisheries dock throughout the spring 
months. G. annulatus reached its maximum after Calliopius had started to decline, 
although the collections of April often contained many specimens of both species. 
Verrill records great swarms of Calliopius far out at sea during this season. On 
one occasion they were found to be very abundant in the Gulf Stream. 
After heavy northeast or southeast storms great numbers of amphipods are 
often found in the tow. At such times, however, many species usually appear. 
This condition characterizes the group and contrasts it with the first group, where 
June 
July 
Auge 
Septe 
Octe 
NOVe 
Dece 
Jane 
Feb. 
Mare 
Apre 
g 
Corophium cylindricun 
Caprella geometrica 
Amphithoe longimana 
Amphithoe rubricata 
Gammarus locusta 
Pontogenia inermis 
Unciole irrorata 
C.mucronatus 
Stenethoé cypris 
Batea secumda 
Elasmopus laevis 
Ptilocheirus pinquis 
‘Caprella linearis 
Paraphoxus spinosus 
Ampelisca compressa 
Ampelisca spinipes 
Byblis serrata : 
Synchelidium spe Hensgeaedl ue aduas 
Jassa marmorata 
Ampelisca macrocephala 
Monooulodes edwardsi EEEE 
Calliopius laeviusculus PEE 
Gammarus annulatus 
Grubia compta 
Tryphosa pinguis 
Enthemisto bispinosa 
Euthemisto rubricornis 
Fic. 52.—Occurrence of amphipods in surface collections from June, 1922, to May, 1923 
one or two species make up tne entire amphipod representation. These conditions 
are particularly obvious in summer. On July 24, 1922, after a hard northeast 
storm, seven species of amphipods and two species of isopods were taken in one 
day’s collection. Such heavy offshore winds carry the surface waters out and 
cause an upwelling of bottom waters, carrying many of the bottom animals with 
them. 
The third group appeared onlyinsummer. It was made up of the same species 
as the second group, but these occurrences were the result of different causes. 
Throughout the summer and particularly after the great diatom maximum the 
water was extremely phosphorescent. At such times the net appeared like a ball 
