362 LITHOTRYA NICOBAR1CA. 



straight row of small discs, which are attached to the walls 

 of the cavity, as explained in the generic description. 



Mouth. — Palpi with their ends square and truncated ; 

 thickly clothed with long spines. 



Mandibles, with fully twice as many pectinations, (viz. 

 from 16 to 20,) between the first and second main teeth, 

 as between (viz. 8 to 10) the second and third main teeth. 

 Inferior angle, coarsely pectinated. The distance between 

 the tips of the first and second teeth, is considerably less 

 than between the tip of the second tooth and the inferior 

 angle. 



Maxilla, with the edge very slightly irregular ; beneath 

 the two great upper spines there is a slight notch, with 

 some small spines : inferior angle slightly prominent, with 

 a brush of moderately fine spines; besides these, there 

 are about seventeen pairs of large spines ; sides very hairy. 



Outer Maxilla, with the inner margin slightly concave, 

 and with the spines continuous. 



Cirri. — The segments in the three posterior pairs sup- 

 port three or four pairs of long spines, with a single row 

 of moderately long intermediate spines ; the dorsal tufts 

 consist of a few rather thick, and some long and thin 

 spines. The front of the segments is not protuberant ; 

 the whole surface is hirsute with minute comb-like scales. 

 Second cirrus, with the anterior ramus having its eight 

 basal segments highly protuberant and thickly clothed 

 with spines, the upper nine having the usual structure ; 

 the posterior ramus has four or five basal segments 

 thickly clothed with spines, and the twelve upper ones 

 with the usual structure. Third cirrus, with the anterior 

 ramus having six segments highly protuberant and thickly 

 clothed with bristles, and the fifteen upper ones on the 

 usual structure ; in the posterior ramus, only three or four 

 of the basal segments are paved with bristles. The spines 

 on the first three pairs of cirri, are coarsely and doubly 

 serrated. 



The Caudal Appendages are more than twice as long 

 as the pedicels of the sixth cirrus, and equal half the 



