I. 2i. ir 



about half as long again as the carpus, and the palm is slightly 

 longer than the fingers. The two lateral margins of the palm are 

 almost parallel. Its upper surface is gently arched and bears a 

 large number of blunt tubercles which are mostly of small 

 size. On the central part of the palm, however, there are 

 two anteriorly converging rows of somewhat larger tubercles. 

 Along the whole outer margin of the joint there are well-deve- 

 loped but rather blunt tubercles. The dactyl is also covered 

 with small tubercles. The tips of the fingers are blunt. 



As already stated the left cheliped is much smaller than the 

 right. On the carpus there is a row^ of sharp tubercles on the 

 upper inner margin and these increase in size towards the distal 

 extremity of the joint. On the middle of the upper surface 

 there is a similar but less prominent row. The propodite 

 resembles that of the right cheliped but is much more slender. 



The next two pairs of legs are long and well developed, those 

 on the right being usually slightly longer than those on the left. 

 The merus is strongly compressed laterally and bears a few 

 scales on its upper edge, but no spines. On the dorsal surface 

 of the carpus there is a single row of spines which increase in 

 size from behind forwards. The upper surface of the propodite 

 bears several irregular rows of tubercles all of which point 

 towards the distal end. The dactyl is much longer than the 

 propodite and bears row^s of small spines on its upper surface. 

 A deep groove runs along the inner surface ; there is a similar 

 but much fainter groove on the outside. The dactyl is marked- 

 ly twisted so that in its distal half the inner surface is turned 

 more or less dorsally. On the lower edge of the dactyl there 

 is a row of sharp transparent spines which are largest and 

 most crowded together near the tip, w^hich is furnished with 

 a strong yellow claw. The dactyl does not taper gradually 

 to its tip but is almost as broad quite close to the distal ex- 

 tremity as it is at the proximal end. 



The fourth and fifth pereiopods are very small and feeble 

 <3ompared wdth the preceding pairs. Those of the fourth pair 

 are laterally compressed and end in imperfect chelae. On the 

 outer part of the propodite there is an area covered wdth closely 

 crowded imbricate yellow scales. 



The fifth pair end in minute chelae and have also an im- 

 bricate scaly area near the distal end of the propodite. 



On the left side of the abdomen there are three unpaired 

 biramous pleopods. The tw^o branches of these are very un- 

 equal, the posterior one being very small. The uropods are 

 unequally developed, that on the left being much larger than 

 that on the right. On both endopodite and expodite there 

 is a large area covered with minute overlapping scales. 



Size. — The length of the carapace in the largest specimen 

 taken by the Helga is 35 '5 mm. 



General Distribution. -^^he species is found in great numbers 

 in all British seas (Bell, Norman, Scott). It has been recorded 



2 



