HIGHER CRUSTACEA OF NEW YORK CITY 



173 



Aegathoa loliginea Flarger 



A e g a t h o a 1 o 1 i g i n e a Harger. Am. Jour. Sci. Ser. 3, 1878. 15:376. 

 Harger. /. c. 1880. p.393, pl.io, fig.66. Richardson. /. c. 1901. p. 526. 



Front of head evenly rounded, eyes 

 very large. Antennae 10 jointed. First 

 thoracic segment longer than others, 

 which are equal in length. Legs armed 

 with strong curved claws. Pleon long 

 and large, uropoda slightly ciliated. 

 (The uropoda in the specimens taken 

 were like the right uropod in the figure.) 



Parasitic in the mouth of the squid 

 usually, but taken on bluefish in Great 

 South bay. 



Length 13 mm, breadth 3.6 mm. 

 Color in alcohol, yellow with minute 

 black spots. 



loll ln " 



Livoneca ovalis (Say) 



C y m o t h o a ovalis Say, T. /. c. 1818. 1 1394. 

 Cymothoa t r i 1 o b a DeKay. I.e. 1844. P-46, pl.io, fig.4O. 

 Livoneca ovalis Verrill. I.e. 1874. P-572. Harger. /. c. 1880. p. 395. 

 Richardson. /. c. 1901. p. 531. 



A parasitic Isopod, with body broadly 

 oval and more or less distorted. Dorsal 

 surface moderately convex. Feet pressed 

 closely to the body and concealed; the 

 first three pairs pointing forward, the 

 last four backward. 



They are found clinging to the roof 

 of the mouth or to the gills of fishes. 

 The bluefish is the usual host, but it 

 occurs on other forms, such as the scup. 



Length 15-22 mm, breadth 1012 mm. 

 Color light with minute, short, dark 

 lines, which may be numerous enough 

 Fig. 44 Livoneca ovalis to give the animal a very deep color. 



