REPORT ON THE PYCNOGONIDA. 45 
a row of very strong hairs placed between the thinner ones (fig. 12). The auxiliary 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 Nynphon brevi- 
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 Mymphon grossipes, O. Fabr. When I first 
examined this species, and made the drawings as figured on Plate III., I knew 
Nymphon grossipes only by the description of Kréyer. Since that time Mr Wilson’s 
paper was published (March 1880), and as soon as I read his description of Nymphon 
grossipes, I almost felt sure that he had examined specimens quite identical with mine, 
and had rightly considered them as Nymphon grossipes. Lately | have had an oppor- 
tunity of comparing the specimens of Nymphon 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. (Pl. III. figs. 183-15, Pl. XV. figs. 12, 13). 
Diagnosis.—Body 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 third, second tarsal 
joint shorter than the first. Auxiliary claws present. 
Description.—The proboscis 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 jomt forming in the females a right 
