132 OPHIUROIDEA. 
arm-plates have a concave proximal and a strongly curved distal 
edge ; the upper surface is carinate and the distal end of the keel is 
knobbed. The side arm-plates intrude considerably on the proximal 
part of these plates and carry about seven spines, of which the 
uppermost is shorter than the next three or four, but not so short as 
the lowermost two or three. The under arm-plates have the distal 
edge wider than the proximal, and often concave outwards. (One 
tentacle-scale. 
Colour very variable, sometimes very dark, often banded and 
spotted with brick-red ; 
vailing hue, sometimes grey, slate, or bluish. 
It is difficult to give a satisfactory account of the length of the 
sometimes a deep brown is the very pre- 
arms; in the four here given the total length of the arm is nearly 
correct for the last only. 
R. Ds 
76 8 
55 55 
4] 4:5 
28 o7 
Distribution. Norway to Mediterranean—often very abundant. 
0-52 fms. 
a-e. Faeroe Bank. ‘Porcupine’ Exp. 
fh. 
59° 35’ N., 9° 11' W., 767 fms. 
z. The Minch. 
‘Porcupine’ Exp. 
‘Porcupine’ Exp. 
j-z. Sound of Mull, Tobermory, 50 fms. John Murray, Esq. 
a’. Sound of Mull, Tobermory, 70 fms. John Murray, Esq. 
6’. Sound of Mull, Tobermory, 5/9/87. John Murray, Esq. 
c'. Loch Leven, 25 fms., 27/8/87. John Murray, Esq. 
d’-h', Firth of Lorn. John Murray, Esq. 
t', x’. Blacksod Bay, 5-6 fms., 01/4/91. R. Tish Acad. 
v'. Blacksod Bay. Dr. Grenfell. 
w'-z', Kenmare River. 
a", b". Portaferry, Aug. 1837, and Strangford, Belfast Phil. & Nat. 
11/10/34. Hist. Soe. 
e'-e", Off Liverpool. 
f"-k". Falmouth. W. P. Cocks, Esq. 
Ul’. Falmouth Harbour. W. P. Cocks, Esq. 
m''-o'’. Falmouth. 
p'-r"'. Plymouth. 
s'-w'', Torbay. 
v''-b®, Weymouth, Oct. 1880. KE. A. Smith, Esq. 
e*—e*, (Herm. R. LL. Spencer, Esq. 
J*. Herm, Sept. 1889. Prof. Bell. 
g®. Channel Isles. R. L. Spencer, Esq. 
h®, 2°. Lulworth, July 1889. F. J. B. Beckford, 
Es 
j°-l. Lobster Patch, Poole, 53 fms. F. JB Beckford, 
/. Loch Etive. 
. Great Cumbrae and Wemyss Ground. 
. West coast of Scotland. 
. 20 miles off Achill Head, 126 fms. 
. 40 miles off Achill Head, 220 fms. 
John Murray, Esq. 
John Murray, Esq. 
John Murray, Esq. 
R. Irish Acad. 
R. Irish Acad. 
