REPORT ON THE OPHIUROIDEA. 219 



small radial shields are set with short spines. Upper arm plates transverse diamond- 

 shaped, with lateral angles sharp. 



{Type specimen from Port Jackson.) Diameter of disk 7 mm. Length of arm 

 28 mm. Width of arm near disk 1-5. The vertical oval has about sixteen stout, blunt, 

 nearly equal tooth papillas, whereof four or five are on the median line, and nearly as 

 large as those on the margin. Four rather thin, squarish teeth, with a cutting edge mak- 

 ing an obtuse angle. Mouth shields small, closely joined to surrounding parts, broader 

 than long, of a transverse, rounded oval shape, having a curve without and a very blunt, 

 obtuse angle within. Side mouth shields narrow, wider without than within, where they 

 meet. Under arm plates with ill-marked outlines of a rude, transverse oval form, with a 

 curve without, lateral sides a little indented and the inner side vaguely angular. Side 

 arm plates with a low spine ridge. Upper arm plates much wider than long, transverse 

 diamond-shape, with lateral angles sharp and the outer one rounded ; length to breadth, 

 •5 : I'l. Disk thick, and puffed in the interbrachial spaces, thickly set near the margin 

 with short, stout stump-like spines rough at ends and sides, the longest '5 mm. in length. 

 Towards the centre the spines grow fewer, and the middle region has scarcely any, so that 

 the rounded overlapj^iug scaling is conspicuous ; next the mouth shields, also, there are 

 no spines. Radial shields small and triaugular, much obscured by the short spines. 

 Nine short, translucent, rather stout, blunt, flattened arm spines, bearing pretty strong 

 thorns on their edges; lengths to that of an under arm plate, "8, 1"5, 1"8, 17, 1'3, Tl, 

 "9, "7, "4 : "5. One minute tentacle scale at angle of under and side arm plates. Colour 

 in alcohol, above, disk faint greenish ; arms banded with lighter and darker yellowash- 

 brown. 



Station, Port Jackson ; 2 to 10 fathoms. 



In its disk this species resembles Ophiothrix triglochis, but the arm spines are much 

 flatter and more toothed, and the upper arm plates of a different shape. 



Ophiothrix angulata, Ayres, Proc. Bos. Soc. Nat. Hist., vol. iv. p. 249, 1852; Lyni., 

 Ill Cat. Mus. Comp. ZooL, No. i. p. 162, pi. ii. figs. 1-3. 



Stella marina minor echinafa 2^>t>T>i'''e(i (^), Sloaiie, Voyage to Jamaica, p. '27'2, pi. ccxliv. figs. 



8, 9, 1725. 

 Stella seolojjenJroides; Jamaicensis purjntrfiu (?), Liiick, JJe Stall. ]Mar., p. 51, 1733. 

 Ophiura angulata, Say, Journ. Phil. Acad., vol. v. p. 145, 1825. 

 Ophiothrix violncea, Miill. & Tr., Syst. Ast., p. 115, 1842; Lym., 111. Cat. Mus. Comp. Zoul., 



No. i. p. 164 ; Ltk., Addit. ad Hist., part 2, p. 150, pi iv. fig. 1. 

 Opliiura Impdda, Ayres, Proc. Best. Soc. Nat. Hist., vol. iv. p. 249. 

 Ophiothrix carihoia, Ltk., Vid. Meddel., p. 14, Jan. 1856. 

 Ophiothrix Kroyeri, Ltk., Vid. Meddel., p. 15, Jan. 1856. 



Station 36. — April 23, 1873 ; off Bermudas ; 32 fathoms. Off Bahia ; 7 to 20 fathoms 

 (young) ; var. Fernando Noronha ; shallow water ; mud. 



