1904] Description of Paracavtia Grani. 9 



proximal joint being only indicated by a ledge on the outer edge, 

 carrying 2 setæ. From the tip of the ramus issue 6 slender setæ, 

 gradually increasing in length outwards. The outer ramus is some : 

 what shorter than the inner, and is apparently divided into 6 articu- 

 lations, each carrying a strong seta. 



The maxillæ (fig. 7) resemble in structure those in Acartia, the 

 masticatory lobe being comparatively small, with only a restricted 

 number of spines, whereas the vibratory plate is well developed 

 and provided with 8 strong plumose setæ. Between the masticatory 

 part and the palp, there is only a single appendicular lobe, car- 

 rying on the tip 3 setæ. The palp itself has the endopodal part 

 quite rudimentary, and only represented by a single thickish seta. 

 The exopodal part, on the other hand, is well developed, forming 

 a rounded oval, somewhat recurved joint carrying 7 slender setæ, 

 2 of which issue from a ledge in the outer edge, the other 5 from 

 the tip. 



The anterior maxillipeds (Pl. III, fig. 1) form each a stout an- 

 teriorly-curving stem divided into 5 segments rapidly diminishing 

 in size. Of these segments, the first 2 constitute the basal part, 

 and are each provided in front with 2 short digitiform lobes. From 

 all the articulations spring slender claw-shaped spines, which curve 

 anteriorly towards the oral orifice, and are clothed with scattered 

 stiff hairs. 



The posterior maxillipeds (fig. 2) are much small er than the an- 

 terior, and are only 4-articulate. The Ist basal joint is råtner broad, 

 and forms anteriorly a projecting lobe carrying 5 long plumose 

 setæ. The 2nd basal joint is much smaller and is oval in form, with 

 a single short seta at the base anteriorly. The terminal part is 

 very narrow and is composed of only 2 joints, the proximal one sub- 

 linear in form and provided with 3 short setæ anteriorly, the distal 

 joint very small, with 2 similar setæ at the tip. 



The natatory legs (figs. 3, 4, 6) are of a very delicate struc- 

 ture, and, as in Acartia, are distinguished by the great length and 

 slenderness of the natatory setæ. The basal part is rather elong- 

 ated, and is, as usual, composed of 2 joints, the Ist of which, how- 

 ever, wholly wants the usual plumose seta inside. Of the rami, 

 the outer one is distinctly 3-articulate, whereas the inner consists 

 of only 2 joints, and is considerably shorter than the outer. 



The Ist pair of legs (flg. 3) are considerably smaller than the 

 others, and also somewhat different in structure. On the outer ramus. 



