EEPOET ON THE OPHIUKOIDEA. 137 



Amphiura concolor, L}tii. (PI, XVII. figs. 1-3). 



Amphmra concolor, Lym., Bull. Mus. Comp. Zool., voL vi., part 2, p. 27, pi. xii figs. 

 317-319, 1879. 



Three mouth papillae on each side, the inner one large and thick, the two outer small 

 and bead-like. Two, sometimes only one, small tentacle scales. Four arm spines. 

 Radial shields narrow and separated. 



(Type specimen from Station 195.) Diameter of disk 8 mm. Length of arm 65 mm. 

 Width of arm close to disk, without spines, 1 mm. Two very short, small mouth papillaj 

 each side of the mouth angle, and a pair, large, rounded, much swoUen at its apex. 

 Four large, thick teeth, with a square cutting edge. Mouth shield wide spear-head shaped, 

 with a blunt angle within, and the inner sides slightly curved. Side mouth shields large, 

 broad without, tapering inward, where they just meet. Basal under arm plates large, penta- 

 gonal with the inner angle truncated, broader than long, outer edge straight, lateral 

 sides re-enteringly curved. Side arm plates rather small, projecting moderately, meeting 

 neither above nor below. Upper arm plates short and wide, of a transverse pointed oval 

 form, with outer and inner edge slightly curved. Disk round and flat, but rather thick, 

 covered with irregular, overlapping scales ; those in the interbrachial spaces being some- 

 what coarser than the others. Eadial shields long and narrow, with outer end rounded, 

 and an acute angle inward, separated their entire length by a single row of scales. 

 Interbrachial spaces on the under surface covered by similar, but finer, scaling. Four 

 short, blunt, rather slender arm spines, the upper one being slightly shortest. Two 

 small, rounded tentacle scales, one on the brachial side of the tentacle pore and one on 

 the side arm plate. On some pores there is but a single scale. Colour in alcohol, straw. 



Station 195.— October 3, 1874; lat. 4° 21' S., long. 129° 7' E. ; 1425 fathoms; 

 grey ooze. Station 191.— September 23, 1874 ; lat. 5° 41' S., long. 134° 4' E. ; 800 

 fathoms ; mud. 



Amphmra depressa (?), L)^m. 



Amphipholis depressa, Ljn., Oph. Viv. Of. Kong. Akad., p. 312, 1866; Ltk., Oph. Nov. Descr. 

 pis. i. and li. figs. 2a, 2b. 



I put a query to this species, though I am nearly sure of its identity. 

 Station 233&.— May 26, 1875; lat. 34° 20' N., long. 133° 35'; 15 fathoms; mud. 

 Fiji Islands ; 6 fathoms. 



Amphmra dalea, Lym. (PL XVIII. figs. 11-13). 



Amphiura dalea, Lym., Bull. Mus. Comp. Zool., vol. vi., part 2, p. 27, pi. xii. figs. 

 320-322, 1879. 



Four mouth papillae on a side. Three arm spines, the middle one swollen. One 

 tentacle scale. Disk scales fine, only the central primary plate being conspicuous. 

 First under arm plate small. 



