208 Oit a Nymphon /Vom the North Pacific. 



are less than the length of the fourth johit. The proportion 

 of this and the remaining joints is as 



7-5 : 8-5 : 3-J6 : 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 setae. The next four joints, in addition to scattered 

 setas, bear an even row of tootiied spines numbering about 

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

 teeth on its inner edge (tigs. 2, 7, and 8). 



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

 Together the first and third coxa; are shorter than the second. 

 The proportion of the remaining joints is as follows: — 

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



The seise inci-ease in number distally, the last three joints 

 being closely covered. In addition there is on the inner 

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

 The claw is powerful and one-third the length of the 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 : '2i) (fig. 4). 



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

 very small (tig. 11). 



In a large genus like Ni/mphon, 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 

 part 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^ viacrum, trum which, how- 

 ever, this species is easily distinguished by other characters, 

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

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

 characters the present sj)ecies could not, 1 think, be mistaken 

 for any species yet described. 



Co-types of the species have been presented by Miss Pixell 

 to the British Museum (Natural History). 



EXPLANATION OF PLATE VII. 



Fig. 1. Nymphon 2n'Vell(Je ; dovaul \itiw. 



Fig. 2. Profile view. 



Fig, 3, Ocular tubercle. 



F%g, 4. Termiual joiuta uf leg. 



