122 DICHELASPIS WARWICKII. 



cimen, on one side of the mouth, the mandible had only 

 three teeth. 



Maxillce, small ; at the upper angle there are two large 

 spines and a single small one, beneath which there is a 

 deep notch, and beneath this a straight but projecting 

 edge, bearing a few moderately large and some smaller 

 spines. Outer maxillae sparingly covered with bristles 

 along the inner margin. 



Cirri. — First pair far removed from the second pair, 

 and not above half their length ; segments rather broad, 

 with transverse rows of bristles not very thickly crowded 

 together ; terminal segments very obtuse, and furnished 

 with thick spines. The segments of the three posterior 

 pair have each three or four pair of spines, with a few 

 minute spines scattered in an exterior, parallel, longi- 

 tudinal row ; dorsal tufts, with four or five long spines. 

 The second cirrus has its anterior ramus not thicker, 

 but rather shorter than the posterior ramus ; the former 

 is only a little more thickly clothed with spines, owing 

 to those in the longitudinal lateral row being longer and 

 more numerous, than is the sixth pair of cirri. Bristles 

 not serrated. 



Caudal Appendages, narrow, thin, slightly curved, about 

 half as long as the pedicels of the sixth cirrus ; in young 

 specimens, the appendage bore seven or eight pair of long- 

 bristles rectangularly projecting; in some older specimens, 

 there was a tuft of bristles on the summit, and two 

 other tufts on the sides. 



I at first thought that the Borneo specimen was a 

 distinct species, but after careful comparison of the ex- 

 ternal and internal parts, the only difference which I can 

 detect is, that the terga are slightly larger, and that the 

 carina, to a more evident degree, is wider, more especially 

 in the middle and lower portions. 



