?43 



elongate as in that species. The upper margin is more strongly convex than in the other 

 species, the whole mandible being narrower in consequence. 



The maxilla (PI. XXV, fig. 9) is short and grows broader towards the free edge — 

 hence this edge is rather long. There is a distinct notch under the upper pair of large spines, 

 and there is another distinct pair of larger spines near the inferior angle. Between these 

 two pairs, as a rule, about seven spines of smaller dimension are observed. Exceptions to this 

 rule seem not to be rare, however: I saw a maxilla of which one (the first) of the spines of 

 the upper pair was not developed, another with three spines of equal size at the inferior 

 angle, a third in which the free edge was furnished with three large spines and very few 

 smaller ones between these. 



The ou ter maxillae (PI. XXV, fig. 10) have the outer lobe elongate and of lanceolate 

 shape, the inner lobe short, oval. The length of the outer lobe, in this species, is greater than 

 in the other species I was able to compare. The hairs on the surface are delicate and numerous; 

 those on the outer lobe form a denser tuft on the inner surface, towards the extremity and 

 along the upper half of the inner side ; a well-developed and irregularly doublé row of hairs 

 extencls, moreover, over the inner surface from the extremity to the upper margin of the inner 

 lobe. The hairs seen on the inner lobe are directed towards the interior and fall over the 

 margin of the quadrate shield-like plate with rounded angles, to which both lobes are attached. 

 The hairs are, as a rule, very delicate, but many of them are distinctly feathered. 



Cirri. Cirrus of first pair has the rami very unequal : the number of segments was 

 found to be 9 and 21 in the smallest specimen, in a somewhat larger specimen 10 and 20, and 

 in a much larger specimen 1 2 and 30. In both rami the segments are tapering towards the 

 extremity. Those of the shorter ramus are almost all broader than long ; in the longer ramus 

 those of the basal part are broader than long, the middle ones are of a quadrate shape, the 

 terminal ones even slightly longer than broad. The segments of the shorter (posterior) ramus 

 have the inner face distinctly protuberant, each protuberance bearing a tuft of stronger hairs 

 or spines on the extremity. The other hairs, disposed on the segments of both rami in the 

 ordinary way, are rather delicate. 



The cirrus of the second pair is shorter than that of the third; the rami are somewhat 

 different in length and have 9 and 11 segments in a smaller specimen, and 12 and 16 in 

 a larger one. Each segment bears a row of hairs along the upper margin and a tuft of such 

 hairs on the extremity of its somewhat protuberant inner face. 



In the third cirrus both rami are elongate; they have 14 and 16 segments in a smaller 

 specimen, and 18 and 21 segments in a larger one. All the segments are nearly quadrate; those 

 of the shorter ramus have a row of rather long hairs along the upper margin, and those of 

 the longer ramus, a group of 3 to 4 long hairs with a few shorter ones disposed on the inner 

 face of each segment near the extremity. The segments of the latter ramus are somewhat 

 protuberant and on these protuberances, between the hairs, a few teeth-like pointed spines 

 are observable. 



The cirrus of the fourth pair (PI. XXV, fig. 11) has 38 segments in the anterior ramus, 

 and 46 in the posterior and somewhat longer ramus in the largest specimen I examined. These 



IT 5 



