468 6. 0. SARS, [t. XIII 



The maxillipeds (fig. 10) each form a short somewhat compressed stem, 

 divided into a number of joints corresponding to those of the gnathopoda and 

 legs. The basal joint is much the largest and rather broad, being produced 

 at the end interiorly to a short, but distinctly-defined masticatory lobe. This 

 is provided at the tip with several short, partly ciliated spines, and has 

 at the base outside a strong plumose seta curving upwards, and 3 others 

 affixed at some distance from the inner edge. The ischial joint is very small 

 and imperfectly defined, whereas the 2 succeeding joints (the meral and car- 

 pal ones) are much expanded and connected by a very oblique articulation. 

 From the outer corner of the carpal joint issues a strong, anteriorly-curving, 

 plumose seta, and inside, this joint is clothed with a great number of small 

 curved spinules. The propodal joint is much smaller than the 2 preceding ones, 

 and of a rounded oval form; it is densely clothed with delicate bristles on the 

 inner edge, and has besides 3 rather strong plumose setse, 2 of which issue from 

 the tip, the 3rd from the outer edge. The dactylar joint is extremely minute 

 and linear in form, provided at the tip with 3 small spines. 



At the base of these limbs is attached the complicated branchial appa- 

 ratus, which the author elsewhere has shown to be composed of the modified 

 expodite and epipodite. In its structure it perfectly agrees with that figured 

 in the next species (see PI. Ill, fig. 5). 



The anterior gnathopoda (fig. 11) are rather slender, and distinctly 

 pediform. The basal joint about equals in length the other joints combined, 

 and is nearly linear in form; it is finely ciliated on both edges, and carries 

 at the end 3 setse, 2 of which are densely plumose. The ischial joint is very 

 small, and but faintly distinguishable, whereas the succeeding ones are all 

 w T ell defined, and constitute together a somewhat incurved terminal part, 

 which is rather richly supplied with bristles, one of which, issuing from the 

 outer side of the propodal joint, is remarkable by its length and dense 

 ciliation. At the base of each of these gnathopoda occurs a semilunar movable 

 lamella, which in the ovigerous female is bordered by a dense row of slender 

 setse increasing in length outwards. These setse project within the incuba- 

 tory pouch, and form, together with those of the other lamella, a broad 

 fan, which by its regular motions may be the means of aerating the inner 

 cavity of the marsupium. 



The posterior gnathopoda (fig. 1 2) are much larger than the anterior, and 

 like the first 2 pairs of legs, are provided at the base with well developed 

 natatory exopodites, consisting each of a somewhat cylindrical muscular 

 basal part, and a flexible 5-articulate flagellum bearing long ciliated setae. 

 The basal joint is very large, nearly twice as long as the remaining joints 

 combined, and somewhat curved. It is provided on the distal half of the 



Bulletin N. S. IV (XXXVI) p. 304. 



