2é BOVALLIUS. iNEW ISOPODA. 



Cymothoa elegans is most nearly allicd to C. recta, Dana, 

 C. eremita, Bruennich, aud 6". liinbata, Schioedte and ]\Ieinert, 

 bnt it is well distinguished from all these, as will be seen 

 from the following descriptiou. 



Ocir/erous female.. 

 Plate V. Hg. 47-56. 



The bodi/ is elongate, almost linear, witli feebly rounded 

 margins, very convex Avitli transversally convcx segments. 

 The surface is härd, smooth, as if it were polished. 



The head is flattened, transversally concavated ou the 

 upper side, with a broad margin on the nnder-side anteriorly. 

 The front margin is slightly emarginated, the lateral and 

 posterior margins straight (Pl. V lig. 49). 



The ef/es are very small, almost imperceptible, situated at 

 the base of the lateral margins. 



The jirst pair of cuitennce (Pl. V fig. 50) are thick, short, 

 with a distinct three-joiuted pedimcle; the third joint is the 

 longest; the flagellum is more slender, five-jointed; the last 

 joint carries a short, tooth-shaped, subterminal spine and four 

 minnte hairs. 



The second pair of aiäennce (Pl. V fig. 51) are seven- 

 jointed, a little shorter than the preceding; the two first joints 

 are short and thick, the following five more slender, the last 

 one fringed with very minute hairs. 



The maxillipeds (Pl. V fig. 52) are robust, the peduncle 

 laminar, the last joint fringed with minute hairs at the anterior 

 corners; the palp is two-jointed; the first joint la^ge, laminar; 

 the second small, cyliudrical, with a feebly curved spine at 

 the tip. 



The first segment of the pereion is long, twice as long as 

 the head, and lono-er than the sixth and seventh segments 

 together (7 : 6) ; it is but little narrower than the fifth (5: 6) ; 

 the very long anterior processes are broad, obliquely truncated, 

 and a little emarginated. The second to fourth segments 

 successively increase in length; the hinder corners are trun- 

 cated, but not emarginated. The fifth to seventh segments 

 decreasc in length; the hinder corners are rounded; the fifth 

 segment is the broadest of all, the seventh the narrowest. 

 The sixth seo-ment is twice as lono- as the seventh. The 



