REPORT ON THE PYCNOGONIDA. 17 
CATALOGUE OF THE SPECIES OF PYCNOGONIDA AT PRESENT KNOWN, WITH INDICATIONS 
.OF THE Hapirat AND RANGE IN DEPTH OF EACH SPECIES. 
A point of interrogation has been placed before uncertain or not sutfticiently deter- 
mined species, and an asterisk before those dredged by the Challenger Expedition, and 
during the cruise of the “ Knight Errant” ; of these a full description is given hereafter. 
In the left-hand column the range in depth of each species is given. 
Class PYCNOGONIDA, Latr. 
Crustacea haustellata, Johnston ; Crustacés aranéiformes M.-Edw. ; Podosomata, Leach ; Pantopoda, Gerstiecker. 
Family I. Nympsonip% 
Contains those Pycnogonida which have both mandibles and palpi strongly developed. 
The ovigerous legs are always present in both sexes, and are, as a rule, furnished with 
denticulate spines. The only genus: NMymphon. 
Depth in Fathoms. Name. Geographical Distribution. 
Nymphon. Fabr. (1794) 
Mandibles biarticulate, cheliform ; palpi, five-jointed ; ovigerous legs, 
ten-jointed. 
A. Species with auxiliary claws. 
10 to 15 Nymphon hirtipes, Bell, Belcher, The Last of the Arctic | Lat. 64° 36’, long. 10° 21’ 5”, 
(Miers). Voyages, vol. ii. p. 408, 1855. Prof. G. O. Sars Off Halifax ; Franklin-Pierce 
33 (Bell). (1877) considers this species to be the same as JN. Bay ; Discovery Bay; Fle- 
48 to 50 hirtum, Fabr., which in that case would not be identi- berg Beach; Northumberland 
(Wilson). cal with WN. hirtum, Fabr., as described by Kroyer Sound. ‘Appears to be a 
52 (U.S. (1845). As it is impossible to recognise the species common inhabitant of the 
Fish. Com.). by the description of Fabricius, I think it safest to high northern latitudes ” 
299 (Sars). retain the name JV. hirtum for the species of Kroyer (Miers). (A common species 
whose description was published long before Sars’ at different stations in the 
Prodromus. WV. hirvtum, Fabr., Sars, in Prodromus Barents Sea. Hoek, in MS.) 
descriptionis, &c. (Arch. fiir Math. og Nat., ii. 1877). 
NV. hirtipes, Bell, Wilson, Pyenogonida of New Eng- 
land, Trans. Connect. Acad., vol. v., 1880. Having 
received from the U. 8. Fish. Commission a specimen 
brought up off Halifax, I feel certain that the animal 
described by Wilson belongs to this species. Finally, 
I believe that the specimens studied by Miers, and 
referred by him to W. hirtum (Arctic Crustacea in 
Ann. and Mag. Nat. Hist., 4th series, xx. 108, 1877 
belong to this species and not to WN. hirtum, Fabr. 
The WN. hirtum, var. obtusidigitwm, Miers, seems to be 
an undeveloped female of the same species. 
(ZOOL. CHALL. EXP.—PART x.—1881) K 3 
