Zoological Society. 227 



EpiiirriPiioRA Kroyeri, White, List, p. 130. 



The body is very highly polished, the edges of the segments behind 

 somewhat tinged with yellow ; the legs and caudal appendages 

 slightly brownish. 



Hub. Van Diemen's Land. 



Named as a small compliment to the very eminent Danish natu- 

 ralist, whose researches among the less studied orders of Crustacea 

 are so well developed in his published but not easily accessible works. 

 I regret that, excepting a few foliated plates of the large ' Voyage 

 en Islanda,' &c, I had not seen any part of them when I prepared 

 the ' List of Crustacea in the British Museum.' 



APTERA ? 



Family Pycnogonid^e. 

 Nymphon Johnstonianum, White. 



Head with a distinct neck thicker than the articulations between 

 the leg. Eyes two, situated above the insertion of the chelicera, on 

 a rather elevated tubercle, which is pointed at the end. Beak spring- 

 ing from the under side of the head, rounded but not knobbed at the 

 extremity, rather thicker in the middle, with two scales on each side 

 at the base, the extreme apex with a triangular depression. 



Chelicera longer than the beak; the two basal joints longer than 

 the third, which is slightly thicker and covered with short hairs ; the 

 end with two sharp claws meeting nearly throughout their entire 

 length. 



Palpi filiform, 10-jointed; four basal joints small, fifth twice the 

 length of the fourth, and thicker than the sixth, which is equal to it 

 in length ; sixth to tenth short, the three last somewhat hairy at 

 the end. 



Thorax very narrow, smooth. 



Legs eight, slightly hirsute ; second and third pairs rather longer 

 than the first ; the fourth the shortest ; each of the joints with some 

 points at the end. 



Tarsi with the first joint very short, the under-side of the second 

 with many spines ; claws two, one smaller than the other. 



Abdomen somewhat elongate, most slender about the middle, ex- 

 tending to beyond the middle of the second joint of the leg from the 

 base. 



In size and general appearance at first sight resembling Decolo- 

 poda australis, Eights. Boston Journ. Nat. Hist. i. 204. t. 7, but dif- 

 fering from it in the number of the legs, structure of the head and 

 claws, &c. 



Hab. South Seas. Capt. Sir E. Belcher, R.N. 



This herculean species is named after Dr. George Johnston, of 

 Berwick-upon-Tweed, who among his many valuable works has 

 monographed the British Pycnogonidte. I am aware that Mr. Goodsir 

 has named a Nymphon Johnstonii after him, but most probably the 

 present species will be found to form the type of a new genus. 



15* 



