178 Memoirs of the Indian Museum. [Vol. IV, 



on either side defining the lateral and antero-lateral margins, and on the second, third 

 and fourth there are two broad and shallow lateral depressions between the thickened 

 lateral edge and the feeble ridge that limits the smooth central portion of the somite. 

 These two depressions are separated by a longitudinal elevation which is itself furrowed 

 This sculpture is inconspicuous, but may be seen without much difficulty in speci- 

 mens of good size, especially after the removal of all surface moisture. The fifth somite 

 is strongly puckered and wrinkled laterally. The poster o-lateral angles of all four 

 somites are subacute, but not spinous. 



The sixth abdominal somite is almost immovably articulated with the telson and 

 the middle of its posterior margin is concave in dorsal view. It bears six oval bosses 

 in a transverse row and the outermost, which is the longest (more a ridge than a boss), 

 trends outwards to meet the external margin in a small postero-lateral spine. In most 

 perfect specimens these elevations are clothed with short setae; the interspaces be- 

 tween them are coarsely and irregularly punctate. 



The general form of the telson is shown in fig. 118. The median of the three dorsal 

 bosses or elevations is somewhat triangular in shape while the submedians, which, though 

 longer, reach only to about the middle of the telson, are more or less pyriform. The 

 lateral margins of the telson and the surfaces of all three elevations are usually beset 

 with short setae similar to those on the last abdominal somite, elsewhere the surface 

 is coarsely reticulate. The distal margin is divided by seven fissures, cut right through 

 the telson, into eight lobes. These fissures l are exceedingly narrow ; they are widest 

 proximally, but distally their margins are usually in contact. The median incision 

 extends almost to the base of the central elevation ; those on either side reach about 

 half way to the lateral elevations. Bach distal lobe of the telson comprises an outer 

 subacute portion and an inner movable denticle. In addition there are numerous 

 denticles on the margins of the median incision, and on the convex inner edges of the 

 submedian lobes. 



The process from the base of the uropods consists of two sharp teeth : the inner 

 at least half the length of the outer. The two segments forming the exopod articulate 

 normally with one another; the innermost bears nine movable spines on its external 

 margin. The margins of the distal segment and of the endopod are uniformly beset 

 with setae. 



Miers regarded this form merely as a variety of G. trispinosus, and in this he has 

 been followed by most subsequent writers ; but, although I have not been able to com- 

 pare the two, there is, I believe, little doubt that G. pulchellus is entitled to rank as a 

 distinct species. 



The colouring of fresh specimens is rather striking. The general tone is pale oliva- 

 ceous brown due to a profuse marbling of warm olive brown on a pale ground. The 

 whole surface is in addition sprinkled with very small black chromatophores. On the 

 carapace there are faint indications of anterior and post-median dark transverse bands, 

 while, on the post-abdomen, two pairs of dark spots on the sixth thoracic, and a dark 

 median patch on the first abdominal somite are generally conspicuous. Median patches 



1 The fissures are best seen if the telson is examined from below. 



