THE MOUNT DESERT REGION 225 



Sars in liaving an extra seta on the distal segment of the fifth 

 foot. The species is new to New England. On mnd, depth 

 90 feet. Station: D 1. 



Tribe CYCLOPOIDA 



Subtribe GXATHOSTOMATA 



Kiefer's (1929) monograph in Das Tierreich is an invalu- 

 able gnide to the literature of this group as well as to his 

 important views on nomenclature and synonymy. 



Oithonidae 



Oithoninae 

 OiTHONA Baird 



0. siMiLis Claus. {lidgolmuUca G. O. Sars, 1913, p. 8, pi. 3.) 

 In the early part of the summer a common plankton form. 

 Stations: D30; S6; P5, 6, 10. 



Cyclopinidae 



Cyclopininae 



Cyclopina Claus 



C. NORVEGiCA Boeck. (G. 0. Sars, 1921a, p. 102, pi. 69, 

 fig. 1.) Taken at low water on a mud flat. New to New Eng- 

 land. Station: S 25. 



Cyclopidae 



The general of the two fresh-water species included here are 

 taken according to the definitions of Kiefer. 



Eucyclopinae 

 Macrocyclops Claus 



M. annulicornis (C. L. Koch) comb. nov. (G. 0. Sars, 

 1914, p. 68, pi. 42.) In the shallow pond, S 22. 



