EEPORT ON THE PYCNOGONIDA. 



17 



Catalogue of the Species of Pycnogonida at present known, with Indications 

 OF THE Habitat and Eange in Depth of each Species. 



A point of interrogation has been placed before uncertain or not sufficiently 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 haudeUaia, Johnston ; Crustaces araneiformes M.-Edw. ; Podosomata, Leach ; Pantopoda, Gerstecker. 



Family I. Nymphonid^ 

 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 : Nymphon. 



Depth in Fathoms, 



Name. 



Geographical Distributiou. 



Nyinplwn. Fabr. (1794) 

 Mandibles biarticulate, cheliform ; palpi, five-jointed ; ovigerous legs, 



ten-jointed. 



A. Species with auxiUary claws. 



10 to 15 Nymphon hirtipes, Bell, Belcher, The Last of the Arctic 



(:Miers). Voyages, vol ii. p. 408, 1855. Prof. G. 0. Sars 



33 (Bell). (1877) considers this species to be the same as N. 



48 to 50 hirtum, Fabr., which in that case would not be identi- 



(Wilson). cal with N. hirtum, Fabr., as described by Kroyer 



52 (U. S. (1845). As it is impossible to recognise the species 



Fish. Com.). by the description of Fabricius, I think it safest to 



299 (Sars). retain the name N. hirtum for the species of Kroyer 



whose description was published long before Sars' 

 Prodromus. N. hirtum, Fabr., Sars, in Prodromus 

 descriptionis, &c. (Arch, fur Math, og Nat, ii. 1877). 

 N. hirtipes, Bell, Wilson, Pycnogonida of New Eng- 

 land, Trans. Connect. Acad., vol. v., 1880. Having 

 received from the U. S. 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 K hirtum (Arctic Crustacea in 

 Ann. and Mag. Nat. Hist., 4th series, xx. 108, 1877) 

 belong to this species and not to N. hirtum, Fabr. 

 The N. hirtum, var. obtimdigitum, Miers, seems to be 

 an undevokiped female of the same species. 



(ZOOL. CHALL. EXP. — PART X. — 1881) 



Lat. 64° 36', long. 10' 21' 5". 

 Ofl' Halifax ; Franklin-Pierce 

 Bay ; Discovery Bay ; Flre- 

 berg Beach; Northumberland 

 Sound. " Appears to be a 

 common inhabitant of the 

 high northern latitudes " 

 (Miers). (A common species 

 at different stations in the 

 Barents Sea. Hoek, in MS.) 



K 3 



