no. 1404. PARASITIC COPEPODS— CALIG ID JE— WILSON. 603 



First maxillae short and strongly curved, the base only slightly 

 enlarged; second pair longer than the proboscis, straight and acu- 

 minate, with a small tooth on the inner margin near the center. 



Terminal claw on the second maxillipeds bent nearly into a semi- 

 circle. Furca short and wide, the branches longer than the base, 

 straight and divergent. Claws at the tip of the first swimming legs 

 moderately long, and all, together with the seta at the distal corner, 

 the same length. Branches of the second legs longer than usual, the 

 exopod with long and pointed spines. Rami of the third legs large 

 and close together, the spine at the base of the exopod large and 

 strongly curved. Fourth legs four-jointed, w T ith live spines, all 

 slightly curved, the one at the tip of the second joint longer and 

 curved more than the others, the rest about equal. 



Total length 4.5 mm. Length of carapace 2 mm.; width of same 

 1.9 mm.; length of genital segment 1.4 mm.; length of abdomen 

 0.9 mm. 



Color not given. 



(isonyx, fcog, equal and oVi><*;, a claw.) 



This species is based on a single example, which is evidently a 

 female although it lacks the egg strings. It was taken from the gills 

 of the great barracuda, Sphyrsena barracuda (Walbaum), in the West 

 Indies. 



CALIGUS THYMNI Dana. 



Plate XV, figs. 178, 179. 



Caligus thymni Dana, 1852, p. 56.— Dana, 1852, p. 1353, pi. xciv, fig. 3, a-c— 

 T. Scott, 1894, p. 129, pi. xiv, fig. 21.— Bassett-Smith, 1899, p. 451. 



Female. -Carapace oblong, not narrowed anteriorly, the length one 

 and a half times the width. No emargination at the center of the 

 frontal plates; lunules elliptical and not prominent. A short seta on 

 the frontal margin on either side about half way between the lunule 

 and the center. Eyes deep red on a black background. Free segment 

 short and wide. Genital segment oblong, the sides divergent, widest 

 posteriorly, where it is about twice the width of the abdomen; poste- 

 rior angles prominent and tipped with seta?. Abdomen longer than 

 the genital segment, two-jointed, with the basal joint about half the 

 length of the terminal; anus prominent. 



Anal laminae small, tilling out the posterior angles and hardty pro- 

 jecting beyond the anus. The three plumose seta? which they carry are 

 as long as the last joint of the abdomen, and do not diverge, as is many 

 species, but are parallel. 



Egg t uhes a little narrower than the abdomen, longer than the 

 entire body, each containing 4<> eggs. 



First antenna' small, terminal joint very slender and tipped with seta? 

 as long as the joint itself. Second antennae of moderate size with a 



