60 



The scale of the antennae is narrower than in the last species, 

 and on neither edge has it any setae or teeth. The slender 

 flagellum does not reach the distal end of the merus of the 

 chelipeds. 



The third maxillipedes differ from those of U. ruhrovittatus 

 in having a groove on the outer surface of the merus. The teeth 

 of the linea cristata are also longer and sharper. 



The chelipeds differ greatly from those of the last described 

 species in having no covering of setiferous scales. Setae are 

 absent, except for the tufts at the end of the fingers. The ischium 

 is short and slender ; on its lower surface it bears two or three 

 rows of fairly sharp tubercles which point forwards. The merus 

 is a much longer and stouter joint, and its lower surface is 

 furnished with three or four rows of similar but larger tubercles ; 

 the rows vary somewhat in distinctness. The merus is more or 

 less cylindrical, but the two succeeding joints are slightly com- 

 pressed. The carpus is considerably longer than the merus, 

 and the propodite again is longer than the carpus. The carpus, 

 the upper surface of the propodite, and merus are all quite 

 smooth, and are sparsely and minutely punctate. On the lower 

 surface of the propodite, however, there are five or six longitu- 

 dinal rows of very minute tubercles ; they are often very difficult 

 to detect, and are most easily seen in dry specimens ; they may 

 be felt by passing the finger backwards along the joint. The 

 dactyl is only about one-third as long as the propodite. Both 

 fingers bear tufts of long setae which are most crowded near 

 the tip. When closed the fingers are in contact for nearly the 

 whole of their length. The inner edge of the dactyl bears near 

 its base a formidable tooth or process which is almost rectangular, 

 and is about a quarter of the whole length of the cutting surface. 

 There is a slight depression in the inner edge of the other finger 

 opposite this tooth ; the edges of the latter are crenulated. The 

 teeth on the cutting edges of the fingers are not sharp, but are 

 rounded. The tips of the fingers curve towards one another, 

 and cross when closed. The whole surface of the chelipeds is 

 bright and glistening. 



The next three pairs of pereiopods are nearly equal, but the 

 middle pair, the third pereiopods, are the shortest. The merus 

 in the second and fourth pereiopods is flattened laterally, but 

 in the third it is cylindrical. In the second and fourth the carpus 

 is slightly thickened distally, but not in the third. The propodite 

 is more slender in the second pereiopods than in the next two 

 pairs. In each case the dactyl is robust, strongly curved, and 

 bears numerous teeth on its lower surface. 



The lower side of the distal half of the propodite bears a 

 row of long, mobile spines, and these, together with the teeth 

 of the dactyl when bent back, form a very efficient subchela, 

 which enables the animal to get a firm grip of the coral on 

 which it lives. The teeth on the dactyl are broad, and not 

 long and narrow as in C7. ruhrovittatus ; there are usually ten 

 or eleven. 



