REPORT ON THE PYCNOGONIDA. 45 



a row of very strong hairs placed between the thinner ones (fig. 12). The auxiHary claws 

 are longer than half the length of the claw. 



The one female specimen shows large genital openings on the second joint of every 

 leg ; the two males have the openings a great deal smaller, and only on the six hind legs. 

 The female is immature. Its length is 7 mm., that of the males 8 mm. 



Habitat. — Of this species three specimens were dredged along with Nymjihon hrevi- 

 collum, south of Halifax. 



Station 49. May 20, 1873. Lat. 43° 3' N., long. 63° 39' W. Depth, 83 fathoms. 

 Bottom temperature, 1-6° C. Sea bottom, gravel, stones. 



Observations. — The specimens of this species have long been considered by me as 

 closely related to, yet distinct from the Nymplion grossipes, 0. Fabr. When I first 

 examined this species, and made the cbawings as figured on Plate III, I knew 

 Nymphon grossipes only by the description of Kroyer. Since that time Mr Wilson's 

 paper was published (March 1880), and as soon as I read his description of Nymphon 

 grossij)es, I almost felt sure that he had examined specimens c^uite identical with mine, 

 and had rightly considered them as Nymp)lwn grossipes. Lately I have had an oppor- 

 tunity of comparing the specimens of Nymp)hon grossipes dredged during the Challenger 

 cruise with others, undoubtedly belonging to the same species, collected during the two 

 cruises of the Dutch schooner " Willem Barents " in the Barents Sea. As there are, 

 however, a few differences to be pointed out, it would perhaps be better to consider the 

 Challenger specimens as forming a variety of this species, yet I hesitate to make such a 

 proposal, as it is impossible to settle these questions without large collections from the 

 same, or about the same, localities. 



Nymphon brevicollum, n. sp. (PI. III. figs. 13-15, PL XV. figs. 12, 13). 



Diagnosis.— 'Eodj not very slender; legs slender, smooth; neck short; a small 

 interval between the attachment of the ovigerous leg and the first true leg ; intervals 

 between the lateral processes short ; oculiferous tubercle blunt ; second joint of palpi 

 longer than third, second joint of the legs longer than first and thiixl, second tarsal 

 joint shorter than the first. Auxiliary claws present. 



Description. — The pr(il)oscis of this species is comparatively large, and nearly 

 cylindrical. The neck is short, yet the segment formed by the conjunction of the 

 cephalic and the first thoracic segment is tolerably large, there being also an interval 

 (longer in the females than in the males) between the ovigerous leg and the first true leg. 

 The abdomen is small. The oculiferous tubercle rounded and small, with four brown eyes. 



The mandibles vary considerably ; they often have the first joint shorter than the 

 rostrum, the second joint comparatively long, the claws long also, armed with numerous 

 small spines. Those of the males are more slender than those of the females. 



The palpi are very slender ; the first and second joints forming in the females a right 



