EEPORT ON THE OPHIUROIDEA. 131 



the outer side nearly straight, but having usually a feeble lobe in the centre. Disk rather 

 thick, covered with fine, curved, rather thin, overlapping scales, which are largest in the 

 centre, where may be distinguished an ill-marked rosette of primary plates ; those near 

 the margin are much finer (about eight in the length of 1 mm.) ; on the lower surface 

 they become thinner and near the mouth shield are hard to distinguish. Eadial shields 

 short and wide, curved on the interbrachial side, straight on the brachial ; barely touch- 

 ing without, separated within by a narrow wedge of four or five scales : length to 

 breadth, I'l : -6. Three short, cylindrical, gently tapering, blunt, equal arm spines 

 about '5 mm. long. One minute, rounded tentacle scale. Colour in alcohol, pale grey. 

 Station 235.— June 4, 1875 ; lat. 34° 7' N., long. 138° 0' E. ; 565 fathoms ; mud. 



Amphimxt constricta, Lym. (PL XVI. figs. 11-14). 



Amphiura comtrida, Lym., Bull. Mus. Comp. ZooL, vol. vi., part 2, p. 22, pi. xi. figs. 

 295-298, 1879. 



Disk finely scaled on both sides. One tentacle scale. Eadial shield narrow, about 

 thrice as long as wide. Six short, stout arm spines. Upper arm plates narrow. 



(Type specimen from Station, Port Jackson.) Diameter of disk, 5 mm. Length of arm 

 30 mm. Width of arm near disk, 1 mm. One minute, rounded papilla at base of mouth 

 angle, on either side, and a pair, much larger, at the apex. Above may be seen the small 

 scales of first mouth tentacles, which resemble the outer mouth papillae. Mouth shields 

 wider than long, of a tliree-sided or wide heart shape with rounded angles. Side mouth 

 shields long and narrow, especially within, where they do not meet. First under arm 

 plate small and very narrow ; those beyond are small and narrow, a little longer than wide, 

 and four-sided with rounded corners ; they cover only a small portion of the under side of 

 the arm. Side arm plates small and not projecting. Upper arm plates small and cover- 

 ing only a jDortion of the upper side ; pretty regular transverse oval, about twice as broad 

 as long. Disk thick and somewhat puff"ed, covered with regular, small, rounded, over- 

 lapping scales, which are somewhat larger near the centre, where small round primary 

 plates, widely separated by smaller scales, may be distinguished ; below and near margin 

 of disk, the scaling is finer and more delicate, about ten in the length of 1 mm. Radial 

 shields long, narrow, and slightly curved, acute within, separated their whole length by a 

 wedge of many ii-regular scales of several sizes ; length to breadth, 1 : 'S. Six small, 

 short, stout blunt, peg-like, equal arm spines about "3 mm. long, of which one or two are 

 microscopically rough at their ends. The spines at tip of arm are similar, but propor- 

 tionately longer. One rather large oval tentacle scale. 



Station, Port Jackson, Australia ; 2 to 10 fathoms. 



Amphiura josephi nee (young?) Ljn., Dr. Goes, Oph. Of. Kong. Akad., p. G31, 1871. 

 St, Vincent, Cape Verde Islands. 



