A.MPHIPODA. 285 



subquadrate, as long and wide as the first 3 segments united; the proximal part of 

 the front margin is very convex and fringed with long plumose setae ; the palm is 

 rectangularly transverse, defined by a sharp tooth with 5 equidistant, irregular teeth 

 between it and the hinge of the dactylus. The hind margin is almost straight and 

 about two-thirds as long as the front, with a few seta3 below the palmar angle. 

 Dactylus slightly curved, narrow, witb subparallel margins, (be point meeting that 

 of the defining tooth (fig. 42. gn. 2 d*). Dr. Giles' specimen had only 3 teeth on the 

 palm, but this is a feature that doubtless varies with age. 



First perasopods rather longer than the first 3 joints of the 2nd gnathopods in the 

 male, and as long as the whole limb in the female; 1st joint curved in the male, 

 straight in the female, rather stout; 3rd and 5th subequal in length, the 3rd widened 

 distally with a group of long stiff setae at the anterior angle. Dactylus rather 

 slender and recurved (fig. 42. pp. 1 ). In the female this limb is much more setose 

 than in the male. 



Second peraeopods in the female like the 1st pair ; in the male smaller and with 

 the 1st joint straight. 



Third perasopods about as long as the 2nd pair in the male : 1st joint much 

 expanded behind and fringed on both margins ; next 3 joints subequal in length and 

 width; 5th longer and narrower, with 5 or 6 spines on the hind margin. All the 

 joints have long plumose setae on the front margin and the 3rd and 4th joints have 

 a group at the posterior angle as long as the next joint. Dactylus rather short, 

 recurved, and reversed as in Photis (fig. 42. pp. 3 o"). 



The remaining perasopods increase in length successively, the last pair extending 

 beyond the uropods and having the 1st joint broader than the 4th pair. Both pairs 

 are densely hirsute. 



The first uropods extend a little beyond the 2nd, and these beyond the 3rd ; in 

 the 1st and 2nd the rami are subequal and shorter than the peduncles, all the parts 

 being spinous. 



The 3rd uropods have the outer ramus shorter than the peduncle, without a 

 terminal joint, but with 3 short spines and some stiff setae at the tip ; inner ramus a 

 spiniferous tubercle (fig. 42. up. 3 ). 



Telson as in Microprotopus, squarely truncate when seen from above mounted, 

 with 3 or 4 setae in each angle ; it does not quite reach the end of the peduncle of the 

 3rd uropods. 



Length of male, 4 millims. 



Incubatory lamelke elongate-triangular, the apex below. 



The great size and resemblance in shape and colour to a broken piece of shell in 

 the hands of the 2nd gnathopods of the male suggest, as in Melita anisochir, Kr., a 

 protective purpose. It is, however, not easy to see why, in both species, the males 

 only should be protected. There can, I think, be little doubt that Eurystheus 

 hirsutus, Giles {loc. cit.), is the female of this species. 



