COPEPODS OF THE WOODS HOLE REGION 



445 



ventral surface of genital segment; caudal rami foliaceous, diver- 

 gent. Rami of first three pairs of legs 2-segmented, of fourth pair 

 1-segmented ; basal segments of second and third pairs forming wide 

 aprons across the body; no fifth legs. 



Male. — Carapace larger than rest of body, with large posterior 

 lobes; second and third segments fused, with one pair of lateral 

 plates, each with a spine at its anterior corner. Fourth segment with 

 a pair of lateral plates that do not meet on the midline. Genital 

 segment subquadrangular, its dorsal plates completely fused, with a 

 shallow posterior sinus and a spine at each outer corner. Abdomen 

 partly visible dorsally, 1-segmented; caudal rami longer than wide. 

 A single species in the present area. 



PmLORTHRAGORISCUS SERRATUS (Kr0yer) 



FiGUEB 280 



Dinematura serrata Ke0yee, Naturh. Tidsskrift, set. 3, vol. 2, p. 176, pi. 8, 1863. 

 Philorthragorisciis serratus Wilson, Proc. U. S. Nat. Mus., vol. 33, p. 479, pis. 

 42, 43, 1907. 



Occurrence. — Found on the outside surface and fins of the com- 

 mon sunfish at Woods Hole, and in the Gulf of Maine. 



Distnhution. — Netherlands coast (Horst) ; English seas (Bassett- 

 Smith, T. Scott) ; North Atlantic (Brian, Fowler) ; Vineyard Sound 

 (Wilson). 



Figure 280. — Philorthragoriscus serratus: a. Female, dorsal 

 (drawn by A. H. Baldwin, 1873) ; 6, male, dorsal 



Color. — Body a clear yellowish white, clouded with gray, some- 

 times the one color predominating, sometimes the other. 



Female. — Carapace with acuminate teeth on the lateral and pos- 

 terior margins, the lateral areas with a distinct groove between the 

 head and first segment ; fused second and third segments filling the 

 71937—32 30 



