No. 477] RHODE ISLAND COPEPODA 



647 



Abdomen slender, 5-jointed. Anal segment with few spines and 

 furca without spines on the upper surface. Furca six times as 

 long as broad, inner edge with long slender bristles. Fureal sette 

 as in the female, therefore longer than the furca. The left first 

 antenna is relatively longer than in the female, reaching to the 

 second segment of the abdomen. Right first antenna as in E. 

 herdmani, i. e., about as long as left antenna, very hea\T, and with 

 the terminal portion composed of two long segments and a min- 

 ute terminal segment; seventeenth and eighteenth joints with a 

 comb-like ridge; nineteenth joint with a notch on the anterior 

 side at base and two toothed ridges beyond the notch. The 

 right fifth limb (Fig. 9) is 5-jointed, the last two not being fused 

 and the next to the last slightly swollen at base. Left fifth limb 

 5-jointed, the last joint separated from the fourth joint by an 

 oblique hinge and ending in three lobes, each with a spine upon 

 its apex. 



The first to fourth limbs of both sexes are very similar to those 

 of E. velox. 



Length of 9 , L8 mm.; cephalothorax, L07 mm. 



Length of 6", 0.9 mm.; cephalothorax, 0.68 mm. 



Narragansett Bay, January to April ; Charlestown Pond, summer. 



Males and females of this species were l>n>ii<clit thn)u>rli flu* hist 

 molt to sexual maturity. The males liappeiied to moh earlier 

 than the females, and for some days each carried a sj)ermat()phore 

 by its stalk in the fifth liml). anotiier spermatophore being almost 

 or ([uire fully formed within the hodv. 



Eurytemora hirunoides (Xordquist) 



Eurytemora herdmani Thoin])S( 



