COPEPODS OF THE WOODS HOLE EEGION 



429 



Female. — Carapace orbicular, wider than long, its posterior lobes 

 reaching the dorsal plates of the fourth segment. Dorsal plates of 

 second segment lateral and nearly concealed, of third segment median 

 and fused, the posterior margin concave; of the fourth segment 

 nearly as wide as carapace, covering two-thirds of the genital seg- 

 ment, with denticulate margins and a stout spine at each anterior 

 corner. Genital segment elliptical, with wide posterior lobes bear- 

 ing leg rudiments, and between them a median dorsal plate. Abdo- 

 men large and wedge-shaped ; caudal rami oblong, each tipped with 



Figure 2 6 8. — Echthro- 

 galeus denticulatus : 

 Female., dorsal (drawn 

 by Sidney I. Smith, 

 1873) 



FiGDRB 269. — Echthrogale- 

 us torpedinis: Female, 

 dorsal 



two or three small setae. Exopod of fourth legs distinctly 3-seg- 

 mented, endopod fused into a single lamina, which is unarmed. 

 Total length, 9 mm. 



Male. — Unknown. 



Remarks. — This species can be identified by the denticulate mar- 

 gins of the fourth dorsal plates, and the spines at their anterior 

 corners. The host is only rarely captured and this probably accounts 

 for the paucity of material. 



ECHTHROGALEUS TORPEDINIS Wilson 



Figure 269 



Echthrogaleus torpedmis Wilson, Proc. U. S. Nat. Mus., vol. 33, p. 371, pi. 21, 

 1907. 



Occv/rrence. — ^Taken from the fins of the common torpedo {Tetra- 

 narce occidentalis) at Woods Hole and at Provincetown. 



Distribution. — Not found outside the present area. 



Color. — Body of preserved specimens a uniform dark cinnamon- 

 brown. 



71937—32 29 



