REPORT ON THE OPHIUROIDEA. 139 



outer and inner edges much curved. Disk flat and slightly angular, covered with thin, 

 semicircular, overlapping scales, the six primary plates being much the largest ; the 

 scaling in the interbrachial spaces is somewhat coarser than on the rest of the disk. 

 Radial shields very large and broad, somewhat longer than wide, of a blunt pear-seed 

 shape ; joined without, separated within by a wedge of two small scales. On the under 

 surface the interbrachial space is covered with very minute scaling. One large tentacle 

 scale longer than broad. Three short arm spines, the upper one longest and slender, 

 whde the middle one is strongly swollen at its base. Colour in alcohol, straw. 



Station 241.— June 23, 1875; lat. 35° 41' N., long. 157° 42' E. ; 2300 fathoms; 

 red clay. 



Amphiura glauca, Lym. (PI. XVIII. figs. 1-3). 



Amphiura glauca, Lym., Bull Mm Comp. ZooL, vol. vi., pt. 2, p. 29, pi. xii. figs. 326-328, 1879. 



Four mouth papillae on each side. One tentacle scale minute and like a lip. Four 

 slender arm spines. Radial shields long and narrow, and diverging inward. Disk 

 naked below. 



(Type specimen from Station 232.) Diameter of disk 5"5 mm. Width of arm close 

 to disk 1 mm. Four short pointed mouth papillae on each side of the mouth angle, of 

 which that at the apex is much the largest and most rounded. Mouth shield small, 

 with a rounded angle inward, and outer edge curved. Side mouth shields small, long, 

 triangular, somewhat curved, just meeting within. Under arm plates small, longer than 

 wide, with re-entering curves on the lateral sides, outer corners rounded and a truncated 

 angle within. Side arm plates small and little projecting, meeting neither above nor 

 below, till some distance out on the arm. Upper arm plates small, a little broader than 

 long, bounded within by a deep curve, and without by a gentler one, having a small 

 ridge in the centre, which forms a continuous line along the arm. Disk rather thick, 

 naked below, but covered above with very minute rounded scales, about seven in the 

 length of 1 mm. where they are finest. Radial shields long and very narrow, tapering 

 inward to a blunt point ; they are joined without, and separated within by several small 

 scales. Four slender tapering arm spines, the upper and under being usually somewhat 

 longer than the two in the middle. One very small lip-like tentacle scale, on the inner 

 side of the tentacle pore. Colour in alcohol, dull grey. 



Station 232.— May 12, 1875 ; lat. 35° 11' N, long. 139° 28' E.; 345 fathoms; sandy 

 mud. Station 236.— June 5, 1875 ; lat. 34° 7' K, long. 138° 0' E.; 420 fathoms ; mud. 



Amphiura verrilli, Lym. (PI. XVII. figs. 16-18). 



Amphiura verrilli, Lym., Bull. Mus. Comp. ZooL, vol. vi., pt, 2, p. 29, pi. xii. figs. 329-331, 1S79. 



Four mouth papillae on each side. Four arm spines. No tentacle scales. Radial 

 shields large and wide, and joined for half their length. 



