208 On a Nymplion from the North Pacijic. 



are less tlian tlie length of the fourth joint. The proportion 

 of this and the remaining joints is as 



7-5 : 8-5 : 3-16 : 1-5 : -88 : '75. 



The fifth joint is more slender than the fourth, and is 

 markedly swollen at the distal extremity ; and on the swelling 

 are numerous hairs. The sixth joint is straight, with 

 few setse. The next four joints, in addition to scattered 

 setae, bear an even row of toothed spines numbering about 

 18, 12, 14, 13. The claw is powerful, with 15-17 small 

 tetth on its inner edge (figs. 2, 7, and 8). 



The leys are very long, attaining a length of 83 mm. 

 Tooether the first and third coxse are shorter than the second. 

 The proportion of the remaining joints is as follows: — 

 16 : 20 : 29 : 6-5 : 2-8. 



The setse increase in number disfally, the last three joints 

 being closely covered. In addition there is on the inner 

 surface of each an even row of lanceolate larger setaj (fig. 5). 

 The claw is powerful and one-tliird the length of tiie pro- 

 podus. Accessory claws are well developed. The relative 

 lengths of claw and accessory claws (in the same terms as 

 above leg measurements) are as '92 : "25 (fig. A). 



In one specimen only were egg-masses seen : the eggs are 

 very small (tig. 11). 



In a large genus like Nymplion, where species are in the 

 main characterized by differences in the relative size, or in 

 the degree of development, of the several parts, or where one 

 ])art may be enlarged and another diminished with little 

 apparent order or connection, there is very little ground for 

 assumption as to the actual kinship between one species and 

 another. Among our Atlantic species, it is perhaps N. longi- 

 tarse that this new species most resembles in general pro- 

 portions both of limbs and body. On the other hand, 

 the slender and graceful chelae and chelifers more closely 

 resemble those, for instance, of A'^. macrum, from which, liow- 

 ever, this species is easily distinguished by other characters, 

 such as those of the neck, the palp, the length of the tarsus, 

 and the form of the ocular tubercle. In its assemblage of 

 characters the present species could not, 1 think, be mistaken 

 for any species yet described. 



Co-types of the species have been presented by MissPixell 

 to the British Museum (Natural History). 



EXPLANATION OF PLATE VIL 

 Fig. 1. Nyi7iphon pixellce ; ^oxsii\ y'mw . 

 Fig. 2. Profile view. 

 Fig. 3. Ocular tubercle. 

 Fig. 4. Terminal joints of leg. 



