Chiltox. — Ceina, an Abernnif (rcnus of the Talifridde. 



127 



and there are a few scattered on the .surface of the joint ; tlie concave 

 margin of the dactyl bears a row of small setae, but the tuft near the apex 

 has not yet been developed. 



The first gnathopod of the female (fig. 17) shows the same general shape 

 as that of the male, but appears to be somewhat longer and more slender ; 

 the basal joint is long, slender, somewhat curved ; ischium and merus 

 •of about equal length, these three joints practically free from setae ; carpus 

 is shorter than the propod, triangular, and with 5 or 6 spines on its 

 posterior margin ; the propod oblong rather than oval, palm slightly 

 oblique, fringed with fine spinules and bounded by a stout spine ; numerous 

 other spinules fringe the hind-margin, and others are situated on the surface 

 near the margin ; the finger is strong and much curved. 



Fig. 18. — Ceina eyregia ; second gnatliopocl of female. 



The second gnathopod of the female (fig. 18) is similar in general 

 appearance to the first, but is somewhat larger and has the carpus slightly 

 shorter in proportion to the propod ; the branchia is oval in shape, some- 

 what narrow and nearly as long as the basal joint ; the brood plate is oval, 

 as long as the basal joint, and has its margin fringed in the usual way with 

 long slender setae. 



The peraeopoda are very nearly subequal in length, the first (tig. 19) 

 and second being only slightly shorter than the following ; all are strongly 

 cJiitinous and comparatively free from setae. They are all fairly normal 

 in shape, and only one or two points require special notice. The basal 

 joint of the third (fig. 20) is moderately produced posteriorly but narrows 

 a little below ; its margin is free from setae or serrations, but shows short 

 transverse lines, giving it a crinkled appearance. In the fourth peraeopod 

 (fig. 21) the expansion of the basal joint is rather greater proximally. 



