94 THE VOYAGE OF H.M.S. CHALLENGER. 
APPENDIX I. 
DESCRIPTION OF THE SPECIES DREDGED DURING THE CRUISE 
OF THE “ KNIGHT ERRANT.” 
During the recent cruise of the ‘ Knight Errant,” organised by Prof. Sir Wyville 
Thomson to acquire a more accurate knowledge of the abnormal distribution of tempera- 
ture in the Faroe Channel, numerous Pycnogonids were collected by trawling. As this 
cruise bears upon the voyage of the Challenger and the study of the results of her 
voyage, I was asked to give also a description of these forms for this report. 
Nymphon strémi, Kroyer. 
Nymphon strémii, Kroyer, Bidrag til Kundskab, &c., Natiirh. Tidskr., N. R., i. 111, 1845. 
Nymphon gracilipes, Heller, Crustaceen, Pycnogoniden, und Tunicaten der K. K, Oester. 
Ungar. Nordpol. Exped. Denkschr. der Math., Naturw. Classe der Kaiserlichen Akad. der 
Wiss., xxxv. 40, 1875, 
Nymphon strémii, Kroyer, Miers, Ann. and Magazine, 4th series, vol. xx. p. 109, 1877. 
Nymphon gracilipes, Heller, G. O, Sars, Prodromus descriptionis Crustaceorum et Pyenogoni- 
darum, quae in expeditione Norvegica, anno 1876, observavit, Arch, f. Math. og Naturvid., 
ii. 265, 1877. 
Nymphon stromii, Kroyer, Wilson, Pycnogonida of New England, Transact. Connect. Acad., 
vol, v. p. 17, pl. vi. fig. la-1h, 1880. 
This beautiful and distinct species is accurately described by Kroyer, and also by 
Wilson. Its synonymy and wide geographical range I have discussed at some length in 
the description of the Pycnogonids collected during the two cruises of the Dutch schooner 
*“ Willem Barents” in the Barents Sea, which at this moment is in the hands of the 
printer, and will be published probably before the end of the year (1880). 
The dimensions of the ‘‘ Knight Errant” specimens are much smaller than those of 
the specimens described by Heller and myself, and even smaller than those which Wilson 
has got from the neighbourhood of the North American coast. 
The extent” of the largest “Knight Errant” specimen is not quite 100 mm. The 
_ 1 Supplement-Band of the Niederliindisches Archiv fiir Zoologie, Leiden, E. J. Brill. 
° “Extent is the distance from tip to tip of the outstretched legs” (Wilson, loc. cit., p. 5). 
