125 



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

 the ' List of Crustacea in the British Museum,' 



APTERA? 



Family Pycnogonid^. 

 Nymphon Johnstonianum, White. 



Head with a distinct neck thicker than the articulations between 

 the leg. Eyes t\vo, 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, \vith two scales on each side 

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



Chelicera longer than the beak ; the tsvo basai 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 basai joints small, fifth twice the 

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

 in length ; sixth to tenth short, the three lašt 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 

 cla\vs, &c. 



Hah. 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 Fycnogonidce. 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. 



Nymphon Phasma, White. 



Head \vith a longish neck, the greater part of which is as thin as 

 or thinner than the articulations between the legs, thickened in front. 



Beak thick, blunt, and somewhat knobbed at the end. 



Eyes two. situated on a sharp-pointed tubercle. placed between 

 the first pair of legs, somevvhat in front of insertion. 



Chelicera somewhat longer than the beak, thick, two-jointed; 

 second joint rounded, furnished with two claws ^-hich meet through- 

 out. 



