AJMTHIURA. 121 



" Disk greyish ; arms bright orange. 



"A single specimen of this most interesting addition to our fauna 

 was dredged in 1861, by Mr. Jeffreys and myself, on the haddock- 

 ground about six miles to the north of the "Walsey Lighthouse, 

 Shetland, in 40-50 fathoms. The species had, previously to the 

 date just mentioned, been inserted as .British in the ' List of British 

 Marine Invertebrate Fauna ' published by the British Association ; 

 but, as far as we can learn, at that time it had not been taken in our 

 seas ; and it would seem that the name was inserted by mistake for 

 A. chiajii. 



•• The arms of these species are more flexible than those of any 

 other Echinoderm with which we are acquainted. 



" They are commonly coiled upon themselves in many complete 

 circles." 



Allied to A. squamata, but with more slender and longer arm- 

 spines, coarser disk-scales, and longer arm-plates. Perhaps only a 

 variety. 



Distribution. Both sides of Xorth Atlantic. 



5. Amphiura borealis. 



Ophiopeltis borealis, G. 0. Sars. Fbrh. Vid. Selsk. Christ. 1871 



(1872), p. 16. 

 Amphiura borealis, Lyman, Chall. Rep. Oj)h. (1882) p. 144 ; Hoyle, 



Proc. Hoy. Phys. Sac. Ed. viii. (1885) p. 139. 



A small species, with arms more than twelve times the radius of 

 the disk ; scaling of disk distinct on dorsal surface only ; radial 

 shields divergent internally ; three or four short arm-spines, one of 

 which is considerably thickened at its free end. Xo tentacle-scales. 

 Two mouth-papilla?, one at the side and one at the angle. 



Faeroe Channel ; 203 fms. (fide Hoyle). 



Distribution. Lofoten, coast of Xorway. 80-400 fms. 



6. Amphiura bellis, var. tritonis. 



Amphiura bellis, Lyman. Chall. Rep. Oph. (1882) p. 127. 

 Amphiura bellis, var. tritonis, Hoyle, Proc. Roy. Soc. Ed. xii. p. 716 

 (pi. vii. tigs. 1-3). 



Mr. Hoyle gives the following account of the single specimen of 

 this variety known : — 



" Diameter of disk, 12 mm. Arms long and slender, 11 cm. 

 Width of arm close to disk, without spines, 2 mm. Two mouth- 

 papillae on either side ; one large, trapezoidal, at the apex of the 

 mouth-angle, one of its sides coinciding with the corresponding 

 margin of its fellow, the ten papillae almost enclosing the circle 

 of the mouth ; the other mouth-papilla is at the commencement 

 of the oral process, is acutely pointed and triangular, and is 

 succeeded immediately by a diamond-shaped scale, which covers the 

 opening of the first tentacle. A supplementary scale was noticed at 

 one mouth- angle. 



