Boone, Crustacea, Cruises of " Eagle'' and "Ara," 1921-28 205 



is slenderer and a trifle longer than the outer ; both are curved, taper- 

 ing distally to an acuminate point, the outer lateral margin slightly 

 convex, proximally, the inner lateral margin correspondingly concave. 

 Legs : The seven pairs of legs are similar, strongly prehensile, the 

 posterior four pairs being slightly longer than the anterior three pairs. 

 The first segment is stout, elongate, excavate on the outer postlateral 

 face of the first three pairs of legs and also on the posterior four pairs, 

 but these latter have the anterior lateral face convex and produced 

 into a laminate, convex margin posteriorly. The second segment is 

 scarcely two-thirds the size of the first and is convex, widest distally ; 

 the third and fourth joints are very short; the fifth joint is longer, 

 stocky, slightly curved, compressed, convex, its distal articulation 

 heavily reinforced ; the sixth or terminal article is as long as the fifth 

 and is very curved, tapering, acuminate, its tip closing down upon the 

 fourth article, hook-like. 



Synonymy. — Cymothoa exigua Schiodte and Meinert, Naturh. Tids- 

 skrift (3), vol. 14, p. 232, 234, pi. 6, figs. 7 and 8, 1883-84.— 

 Richardson, Bull. 54, U. S. Nat. Mus., p. 250, fig. 261 (after 

 Schiodte and Meinert), 1905. 



Cymotlioa excisa Perty. 

 Plate 77, fig. B. 



Type : The type came from Sebastionopol, Brazil, and is deposited 

 either in Munchen or Berne. 



Distribution : Known to be parasitic on the lip and gill of two 

 fishes, a * * Chub ' ' and a species of Sparus. Found from Massachusetts 

 southward along the East Coast of the United States, throughout the 

 West Indies and along the northeastern coast of South America, as 

 far down as Rio de Janeiro. 



Material examined : One specimen from fish, Pilon, Cuba, March, 

 1928. 



Technical description: The head is about one-third wider than 

 long, deeply inserted in the first thoracic segment ; the prominent, 

 narrowed, acute anterolateral angles of which extend forward about 

 half the length of the head. The median frontal portion of the head 

 curves downward and the anterolateral angles are rounded and curve 

 slightly upward, so that in a dorsal view the frontal margin appears 

 slightly excaA^ate. The eyes are small, indistinct, placed about mid- 

 way the lateral margin. 



