250 BFLLETIX •")4. UXITED STATES NATIONAL MUSEUM. 



All tlio legs are preluMisilc. tenniiuitino- in long, luwrow curved 

 dactvli. There is a high carina on the exterior margin of the basis 

 of the last four pairs of legs; the height of the carin;i increases from 

 the fourth to tlie seventh, where it is extremely high." 



CYMOTHOA EXIGUA'' Schioedte and Meinert. 



Ctfmofhoa exiffua Schhedte and Meixert, Naturh. Tidsskrift (^S), XIV, 1883-84, 

 pp. 282-234, pi. VI, figs. 7-8. 



Localiilcs. — Panama; also Charles Island, between the Galapagos 

 Islands. 



Found in the mouth of dtharieJithys sordlda. 



Bodv ovate, rather compressed, more than t^vice as long as wide 

 (9:1)." 



Head moderately large, subtriangular, widely rounded in front, two 

 or three times narrower than the fourth thoracic segment (almost '1: o), 

 manifestly wider than long (almost 7: •)), a little immersed, frontal mar- 

 gin incurved, widely rounded. 



Eyes distinct, moderately large, subtriangular or subrectaugular. 

 First pair of antenna^ smooth, rather stout, extending with the last 

 article to the anterior angle of the tirst segment of the thorax, or to 

 the eighth article of the second pair of antenntv; they are composed of 

 eight articles. 



The second pair of antenna^ are smooth, or rather compressed, much 

 more slender than the tirst pair of antenna\ and extend with the two 

 last articles to the anterior angle of the tirst thoracic segment; they 

 are composed of nine articles. 



The anterior margin of the tirst thoracic segment is straight, with 

 the anterior angles short and ol)tusely rounded; the sides of the 

 segment are straight. 



The posterior angles of the anterior thoracic segments are roundcnl, 

 those of the posterior ones truncately rounded. 



The epimera are incurved and rather long; those of the tirst and sec- 

 ond pairs are rather narrow, posteriorly a little dilated, obliciuely and 

 rounded truncate; those of the third and fourth segments are rather 

 narrow, posteriorly a little narrower, obliquely and wideh' rounded; 

 those of the lifth and sixth pairs are rather Avider, posteriorly ver}^ 

 much narrower (but little narrower in the voung female), and obliijuely 

 and widely rounded. The (^pimera of the tirst, second, and third pairs 

 do not reach by a great and graduallv increasing distance the posterior 

 angle of the segment; those of the fourth pair do not reach bj^ a small 



"For the description of the male, female, and the young of the first and second 

 stages, see Schianlte and Meinert, Nat. Tidsskr. (3), XIV, 1883-84, pp. 238-244. 



^ This species is included because the fish on which it is parasitic is found as far 

 north as the coast of (California. 



