No. 472] MASSACHUSETTS COPEPODA 



249 



Cyclops albidus (Jurine).— An abundant species. Localities: 

 Arlington, Brookline, Cambridge, Nantucket, Watertown, Welles- 

 ley. 



Cyclops bicolor Sars. — This species was observed only once at 

 Cambridge, on August 6, 1905. 



Cyclops varicans Sars. — Occurred once in a collection made on 

 Nantucket Island, May 30, 1905. 



Cyclops serrulatus Fischer. — An abundant species. Localities: 

 Arlington, Brookline, Cambridge, Middlesex Fells, Nantucket, 

 Randolph, Watertown, Wellesley. 



Cyclops phaleratus Koch. — Localities: Cambridge, Wellesley. 



Cyclops fimbriatus poppei Rehberg.— Localities: Cambridge, 

 Middlesex Fells, Nantucket. 



Genus Canthocamptus Westwood 



Canthocamptus staphyUnoides Pearse.— This is an abundant 

 species. Localities: Cambridge, Middlesex Fells, Nantucket, 

 Reading, Wellesley. 



Canthocamptus illinoisensis Forbes. — Common in a dredging 

 made October 9, 1905, at Wellesley. 



Canthocamptus minutus Claus.— Localities: Middlesex Fells. 

 Stony Brook. 



Canthocamptus northumbricus americanus Hcnic k. — This spe- 



The length of thv tVnialr was I.IH mm. which is longer than Her- 

 rick ('95) gives. In other respects the female was similar to his 



