REPORT ON THE CRUSTACEA MACRURA. 525 



In these several specimens from very distant localities, the presence of an extra 

 tooth on the lateral margin of the rostrum, and the cleft condition of the dactylos of the 

 p osterior pair of pereiopoda are constant, and the sharp spine-like tooth attached to the 

 boss on the coxal plates of the pleon is present in the best-developed forms, but that its 

 presence is not a specific feature may be inferred from the circumstance that in one 

 specimen it is found to exist on one side and not on the other, the absence in some 

 instances being probably due to friction. 



The type of this species was brought up by the trawl in the same locality in the 

 South Atlantic (Station 133) at which Willemcesia leptodactyla was obtained, and it is 

 worthy of remark that while in this last-named genus the organs of vision are reduced 

 to a rudimentary condition, those of Glyphocrangon are unusually large. 



Nika, Kisso. 



Nika, Risso, Crust, de Nice, p. 84, 1816. 



,, Milne-Edwards, Hist. Nat. Crust., t. ii. p. 363. 



„ Bell, Brit. Crust., p. 273. 



,, Dana, U. S. Expl. Exped., Crust., p. 533. 

 Processa, Leach, Malacos. Pod. Brit., pi. i. 



Carapace smooth, about one-third of the length of the animal ; anteriorly produced 

 to a short smooth rostrum, horizontal w<ith the dorsal surface and not laterally compressed. 

 Outer canthus of the orbit defined by a small projection of the margin, beyond which is 

 an antennal tooth, between the two antennae, whence the margin is smooth to the fronto- 

 lateral angle, which is defined by an imperfect point. 



The pleon is smooth and the somites subequal in length, the first being divided, the 

 anterior portion passing under the carapace. 



Telson long, slender and tapering. 



Ophthalmopoda short, uniarticulate. Ophthalmus subreniform ; having no ocellus. 



First pair of antennae having a rounded concave stylocerite at the base, and terminating 

 in two unequal flagella. 



The second pair of antennas is subequal in length with the animal, and carries a lono- 

 scaphoeerite, squamose on the inner side, strengthened and toothed on the outer. 



Mandibles without either a psalistoma or synaphipod. 



The first pair of siagnopoda has three branches, one of which is membranous and 

 rudimentary, the other two short and tipped with hairs. 



The second pah has a rudimentary central or primary branch and a large squamose 

 plate of extreme tenuity projecting anteriorly and posteriorly. 



The third pair is squamose, having a rudimentary central branch and two squamose 

 plates; the inner is narrow and fringed with strong hairs, the outer broad, rounded 



