ARGULIDJ5 OF THE WOODS HOLE REOloN. 



129 



Argulus megalops Smith. Male ami female known. 



Carapace elliptical, longer than wide, scarcely covering the third pair of legs; posterior sinus 

 triangular and shallow, lobes broadly rounded and free from the thorax. Eyes very large (one-tenth 

 of the breadth of the carapace) and far forward; thorax partly uncovered, narrowing slightly poste- 

 riorly; abdomen broad elliptical, slightly longer than wide; anal sinus triangular (not more than 



Argulus megalops Smith, a. Two posterior swimming legs of male; h, posterior maxilliped of male; c, antenna of female 



r/, ventral surface of female. 



one-fifth the entire length); papilla basal. Antenna' medium, closely approximated and well-armed; 

 sucking discs small. Posterior niaxilhpeds large, well-armed; basal plate broad triangular, teeth 

 rather widely separated, stout and blunt. Swimming legs long, projecting far beyond the edge of the 

 carapace, without flagella; lobes on posterior legs narrow- and sharply pointed posteriorly. Male with 

 a large thumb-shaped projection on the anterior border of the basal joint of the third legs, in addition 

 to the regular accessory organs. 



B. B. F. I'.Hil— 9 



