108 Mr. E. J. Miers o)i Arctic Crustacea. 



the apex of the terga being produced and acute, and the spur placed 

 close to the basiseutal angle. 



This species occurs on the coasts of Greenland, Iceland, Spitzber- 

 gen, Norway, Finmark, and Britain — also on the shores of Maine 

 and Massachusetts, and perhaps at China (see Darwin, I. c.) 



PYCNOGONIDA. 



Ntmphonid^. 



Nymj)hon hirtum. 



? Nymphmi hirtmn, Fabr. Ent. Syst. iv. p. 417 (1794) ; Kroyer, Nat. 

 Tidsskr. 2 R. i. p. 113 (1844-45) ; Voy. en Scand. Atlas, Crust. 



SI. xxxvi. fig. 3 ; Buckholz, Crust, in Koldewey, Zweite deutsche 

 Fordpolarf. p. 397 (1874). 

 Nymphon hirsutum, Sabine, Append. Capt. Parry's 1st Voy. no. x. 

 p. 48 (1821); Ross, Append. Capt Parry's 3rd Voy. p. 117 (1826) ; 

 Append. Parry's 4th Voy. p. 203 (1828). 

 Nymphon hirtipes, Bell, in Belcher's ' Last of the Arctic Voyages/ Crust, 

 p. 401, pi. XXXV. fig. 3 (1855). 



Coll. Feilden : Franklin-Pierce Bay, five specimens ; Discovery 

 Bay, one specimen ; Floeberg Beach, at depth of 10 fathoms, two 

 specimens. 



Coll. Hart: Franklin-Pierce Bay, 13-15 fathoms, three speci- 

 mens. 



I have referred the specimens collected with some doubt to N. 

 hirtum, as in Kroyer's figure of that species not only is the animal 

 represented as much slenderer, but also the chelse of the mandibles 

 have the fingers much shorter and scarcely denticulated on their 

 inner margins. In the specimens before me the fingers are very 

 slender, somewhat curved at the tips, and armed with a row of 

 spinules on their inner margins. In some examples the immobile 

 finger is shorter than the other, as in the form to which Bell (Z. c.) 

 has assigned the name of N. hirt'tpes, which does not otherwise difier 

 from the present species, except in the absence of hairs upon the 

 segments of the body, and can hardly be regarded as distinct 

 from it. 



Fourteen specimens in all were collected of this species ; of these, 

 two are adult females with ova. Length of largest specimen about 

 6| lines (14 millims.), greatest length between tips of legs when 

 extended nearly 3 inches 3 lines (82 millims.) ; of the largest ova- 

 bearing female, nearly 6 lines (12 millims.), greatest length between 

 legs 2 inches 11 lines (74 miUims.). 



In the males of this species the whole animal is more robust, the 

 joints of all the legs, as stated by Buchholz (Z. c), thicker and more 

 compressed ; in the females the second joint of the legs is propor- 

 tionally longer than in the males. I may add that in the two 

 ova-bearing females in the collection the fifth joint of the third (ovi- 

 gerous) pair of appendages is dilated and geniculated near its distal 



