REPORT ON THE OPHIUROIDEA, 223 



bend together so as nearly or quite to reunite ; length to breadth, 9 : 4"5. On joints next 

 disk there are nine slender, glassy, translucent, slightly flattened feebly thorny spines, 

 whereof the uppermost are extremely long and elegant ; those below progressively 

 shorter; lengths to that of an underarm plate, 15-5, 15, 13, 9, 7, 6, 5, 3, 17 : 1'7. One 

 small, blade-like tentacle scale in the angle of the under and side arm plates. Colour in 

 alcohol, above, pale brownish-pink ; below, very pale yellowish-brown ; along upper side 

 of arm is a wide, brown stripe, whose edges are darkest. 



Station 204.— November 2, 1874; lat. 12° 43' N., long. 122° 10' E. ; 100 to 115 

 fathoms ; mud. Cebu ; 100 fathoms. 



Ophiothrix capillaris belongs near OpMothrix comata and Ophiothrix suensonii. It 

 has an arm stripe like that of the former, but has little stumps on the disk instead of 

 hair-like spines. 



Ophiothrix purpurea, V. Mart., Monatsb. Konig. Akad. Berlin, p. 346, 1867 ; Lym., 

 Bull. Mus. Comp. Zool., vol. vi., part 2, p. 54. 



Station 177.— August 18, 1874; lat. 16° 45' S., long. 168° 5' E. ; 63 fathoms (?). 

 Station (?) Banda. 



Ophiothrix aristidata, Lym. (PI. XXI. figs. 9-12). 



Ophiothrix aristuJata, Lym., Bull. Mus. Comp. Zool., vol. vi., part 2, p. 50, pi. xv. figs. 

 421-424, 1879. 



Ten moderately stout, feebly thorny, scarcely tapering arm spines. Disk, except the 

 large radial shields, densely set with short, slightly rough spines. 



(Type specimen from Station 142.) Diameter of disk 14 mm. Width of arm near 

 disk 3 mm. There are about thii'ty tooth papilla which are pointed, and are arranged, 

 as usual, in a vertical oval, the exterior line on either side composed of ten or eleven 

 longer ones, whde a similar number of shorter ones, arranged in twos at the centre, and 

 in a single line above and below, fiU closely the middle space. Three short, thick, 

 squarish teeth. Mouth shield well marked, of a transverse diamond shape, with 

 rounded corners. Side mouth shields thick and slightly swollen, rather wide, nearly or 

 c[uite meeting within, taperingly gently inward. Under arm plates somewhat wider 

 than long, with a wide curve without, short re-enteringly curved laterals, and straight 

 inner laterals sloping towards the median line. Side arm plates presenting a moderately 

 prominent spine crest. Upper arm plates wider than long, slightly overlapping, of a 

 transverse diamond shape, with corners rounded or truncated ; each plate has a median 

 rido-e, which gives to the upper arm a carinate look. Disk thick and strongly lobed in 

 the interbrachial spaces ; its upper surface occupied chiefly by large radial shields, which 

 are long triangular, with a length to breadth of 5 : 3 ; they unite without, where each 



