C A L T G I D E A. 1355 



jointed, first segment very narrow at base, oblong, subelliptical, 

 posterior angles long and stoutly produced, the following part long 

 and narrow linear; anus not prominent. Caudal stylets sparingly 

 oblong, terminal. Posterior antennae acute on posterior side of base, 

 and armed with a spine exterior to base. Furcula simple, prongs 

 slightly divergent, slender, acute. 



Plate 94, fig. 4, ventral view of female, enlarged. 



Found with the preceding, within the gill-covers of the Bonito, on 

 the operculum. Only two females seen. 



Length, one-fourth of an inch. Very transparent, excepting the 

 external ovarian tubes, which were of a light dirt-brown colour. 



Length of carapax, about one-fifth greater than width. Front 

 emarginate at centre, and having minute processes or papillae like the 

 O. americanus. Sucker disks perfectly circular. Second segment of 

 body not more than one-fifth or one-sixth the width of the carapax, 

 and united to the preceding and following segments by a narrow neck. 



The terminal portion of the abdomen is nearly linear, or slightly 

 larger posteriorly, and about as long as preceding portion. The 

 lamellar stylets are broadest towards apex, and the two are nearly in 

 contact. 



Anterior antennae have the terminal setae less than half the length 

 of the apical joint. 



Posterior antennae with the last spiniform joint slender, scarcely 

 larger at base, and having as usual a stout recurved extremity. Basal 

 joint with a spine directed backward, and exterior to base, a curved 

 corneous process. 



Maxillae, a long and slender aculeate spine, supporting a rudimen- 

 tary jointed appendage, as in other species. 



Second pair of feet, with the base or hand very stout, subconical, 

 and without an immoveable finger ; moveable finger a slender claw, 

 more than half the length of hand. 



First pair of natatories without plumose pinnule^. Last pair of legs 

 long and slender, the second portion two-jointed, and having a ter- 

 minal toothed seta. 



External ovarian tubes rather longer than the body in the speci- 

 mens examined. 



