122 OPHIUROIDEBA. 
‘“* Mouth-shields heart-shaped, one subpentagonal. Side mouth- 
shields appear to be triangular; they do not project inwards beyond 
the median shields, and they meet each other in the position 
usually occupied by the first under arm-plate, which is absent. The 
other arm-plates are rectangular, with the inner and outer margins 
somewhat rounded ; farther out on the arms they form an angle 
so that the plate is hexagonal; the lateral margins straight and 
coincident with the attached margin of one of the tentacle-scales. 
Side arm-plates slightly prominent where the spines are attached, 
and meeting in the middle line either above or below. 
“Upper arm-plates transversely oval, but the proximal margin 
instead of being evenly curved forms an angle. 
“Disk flat, thin, covered with small swollen overlapping scales, 
which are coarser and radially elongated near the radial shields. 
Radial shields wedge-shaped, very long, about four times as long as 
wide, pointed at the proximal extremity, truncated distally, com- 
pletely separated from each other, except perhaps at the extreme 
outer end, by a median and one or two lateral rows of elongated 
scales. Interbrachial spaces in the under surface covered with 
similar small scales ; three, or sometimes at the proximal end of the 
arm four, straight, tapering, bluntly-pointed arm-spines. 
“« Two tentacle-scales, one towards the axis of the arm, elongated, 
semi-oval, one on the proximal margin of the aperture, shorter and 
more nearly circular. 
“Colour yellowish grey, with five rather indefinite radial mark- 
ings on the dorsal surface of the disk. 
“The typical Amphiura bellis differs from this in having one 
short stout blunt papilla on either side of the base of the mouth- 
angle. It has also subtriangular mouth-shields, and the lateral 
mouth-shields do not meet each other in the middle line. 
“The mouth-papille are of a different shape. A first under 
arm-bone is present, and the tentacle-scales of the first pair are 
spiniform and rather conspicuous. 
«This single specimen is worthy of special notice, because the 
species has been only known hitherto from specimens collected by 
the ‘Challenger’ at Stations 174, near the Fiji Islands, and 232 
and 236, off Japan. It is interesting to notice that Asteronyx 
loveni is also common to the North European seas and those of Japan, 
and a relation has been traced by Drs. Gwyn Jeffreys and Giinther 
between the Mollusca and fishes of Japan and the North Atlantic 
and Mediteranean.” 
Dredged at 59° 40' N., 7° 21’ W., 516 fms., during the cruise of 
H.M.S. ‘ Triton.’ 
4. OPHIACTIS. 
Ophiactis, Liith. Vid. Medd. 1856 (1857), p. 12; Lyman, Ill. Cat. M. C. Z, 
i. (1865) p. 105; ed. Chall. Rep. Oph. (1882) p. 112. 
Ophiolepis, M. Tr. Syst. Ast. (1842) p. 89 (pars). 
No tooth-papille ; teeth; mouth-papille few and small. Radial 
