10 PROCEEDINGS OF THE NATIONAL MUSEUM vol.82 



The foregoing description is compiled from those of preceding 

 authors with some additions and changes resulting from a study of 

 the author's preparations. Herrick found the antennae 24-seg- 

 mented. Forbes and, after him, Schacht considered them 24-seg- 

 mented. A careful study of the preparations at hand leads the au- 

 thor to consider them 25-segmented. The separation of the first 

 two segments is not always easy to distinguish. Moreover, the basal 

 segment is not jointed, and, perhaps on this account, has not been 

 counted by some authors. 



Apparently the peculiar enlargement of the seta on the second 

 segment of the exopod of the male fourth foot with the hollow of 

 the second segment has not been noted by others. This was found 

 constant in all the male fourth feet examined. 



Family TEMORIDAE 

 Genus EURYTEMORA Giesbrecht, 1881 



Last thoracic segment separated from the preceding, often ex- 

 panded into wings, symmetrical in male. Abdomen of female 3- 

 segmented. Abdomen of male 5-segmented. 



First antennae 24-segmented ; but E. gri7n77ii has 25 segments. 

 Terminal portion of right antenna of male generally stated to be 

 2-segmented. Giesbrecht and Schmeil (1898) state "two, seldom 

 more."' Apparently in most cases there is a distinct short terminal 

 segment, which would make the typical number three. Giesbrecht 

 (1882) states that in E. hirundo it is 2-segmented. Sars's figure for 

 E. grinvmi shows five segments, while his figure for E. gracilis shows 

 four. Probably it is safe to say that the terminal portion of the 

 right antenna of the male ordinarily consists of three segments, but 

 in some cases there are more. 



The exopod of the second antenna, as in Diaptomus^ consists of 

 seven segments, with four short ones in the middle. The endopod 

 of the maxilliped consists of five segments, as in Diaptomus^ Lim/no- 

 calanus^ and Osphranticum. The endopod of the first foot is 1- 

 segmented; of feet 2 to 4, 2-segmented. The penultimate segment of 

 the fifth foot of the female has a process from its inner distal angle. 

 The right fifth foot of the male has four or five segments. 



KEJY TO THE SPECIES OF EUBYTEMORA (FROM CHARACTERS OF FEMALE) 



1. Third segment of fifth foot with one external spine 2 



Third segment of fifth foot with two external spines 3 



2. Last cephalothoracic segment expanded, with large wings 



pointed backward velox (Lilljeborg)' 



Last cephalothoracic segment without wings, rounded behind. 



grimmi (Sars) 



* Synonyms : E. udlcri Schiklejew and E. lucinulata (Fischer). 



