NO. B.] ACCOUNT OF THE SPECIES. 23 



with only a very small dentiform projection at each corner. Inside the mastic- 

 atory part, there is a row of thick ciliated spines extending from the lower 

 corner of the cutting edge to about the end of the inner third part of the 

 mandible, and at some distance from its posterior edge (see fig. 9). Anteriorly, 

 at some distance from the cutting edge, each mandible forms an angular 

 projection, outside which the palp is articulated. The latter is rather slender, 

 but scarcely longer than the body of the mandible, and has the terminal joint 

 narrow lanceolate, and shorter than the medial one, both being fringed inside 

 with a row of delicate bristles. 



The anterior maxillae (fig. 10) exhibit quite a normal appearance. The 

 terminal joint of the palp is divided at the tip into several strong teeth, 

 which, as usual, slightly differ in the 2 maxillae. The masticatory lobe is 

 rather prominent, and is armed at the tip, and along the inner edge, with 

 several strong spines. The basal lobe is of moderate size, and slightly 

 curved, and carries inside 9 plumose setae. 



The posterior maxillae (fig. 11) have both lobes rather narrow, the outer 

 one being by far the larger. Both lobes are densely clothed along their 

 inner edge with partly ciliated setae. 



The maxillipeds (fig. 12) are prominently characterised by the enormous 

 development of the masticatory lobes, which form very large, broadly oval 

 plates reaching beyond the penultimate joint of the palps, and easily observ- 

 able on viewing the animal from the side (see figs. 1 & 2). They have the 

 inner edge straight and minutely serrate, the tip obtusely truncate, and the 

 outer edge shghtly curved, with a row of delicate bristles. The basal lobes 

 are obliquely truncated at the end, and each provided inside with a row of 

 strong setae. The palps are comparatively slender, and gradually taper distally, 

 the last joint being rather narrow, oblong, and, like the other joints, clothed 

 with scattered bristles. 



The anterior gnathopoda (PI. Ill, fig. 1) are very slender and but scantily 

 setiferous. Of the joints, the ischial one is unusually prolonged, being of about 

 the same length as the carpal one. The propodal joint is somewhat shorter 

 than these joints, and gradually tapers distally, without exhibiting any distinctly 

 defined palmar edge. The dactylus is comparatively small, and somewhat 

 compressed (see fig. 1 a). 



