78 REPORT OF COMMISSIONERS -OF INLAND FISHERIES. 



stalk, distal joint three times as long as broad, with a conical end and 

 with two heavy serrate outer spines, a long serrate terminal spine, and 

 a short stalked bristle on its upper surface near the distal end. The 

 outer angle of the basal, and the outer side and end of the distal joint 

 are covered with short, heavy, unjointed spines. 



Male. — Thorax like that of female. Abdomen 6-jointed, relative 

 length, OS M 3^ ss in 48 5 - Second joint swollen, bearing on 

 each side a fringe of spines and a single bristle. Abdomen otherwise 

 as in female. Antenna and mouth parts as in the female except that 

 a large 3-jointed maxilliped is present, 1st and 2nd joints of maxilliped 

 of equal length; 2nd swollen and with a number of acute tubercles 

 upon its inner side near the base and two rows of tubercles near the 

 distal end of the joint, with a short bristle at the proximal end of 

 each row of tubercles; distal joint sickle-shaped and serrate, enlarged 

 at base and bearing there a small bristle. Feet as in female. 



Wickford and Matunuck, in the common clam {Mya arenaria) the 

 quahog {Venus mercenaria) and in the sea clam {Mactra solidissima) . 

 Almost every clam and quahog which we opened contained one or 

 more of these copepods in the mantle cavity. A very characteristic 

 matanauplius which is very abundant in the Bay during the spring 

 and summer, resembles this species, and though all efforts to rear the 

 metanauplius were unsuccessful, we suspect that it is the young of 

 this species. 



Phyllopoda. 



*Ceriodaphnia reticulata Jurine. 



Mill Pond, Wickford. 

 *Sida crystallina (Miiller) 



Mill Pond, Wickford. 

 *Pseudosida tridentata Herrick. 



Mill Pond, Wickford. 

 *Scapholeberis mucronata (0. F. Miiller). 



Wickford. Common throughout the eastern United States. 



