344 BULLETIN OF THE 



they form an irregular row about the inner mouth-angle, and usually are 

 turned more or less downwards. The outer mouth-papillae are all more or 

 less widened and flattened ; arranged rudely in four radiating rows, but so 

 spreading and overlapping as to almost hide the whole outer part of the 

 mouth-angle. There are five or six to each side (ten or twelve to each 

 mouth-angle) all foliate in form (much like the wooly fur gus that grows 

 from dead trees) the outer ones largest, and sometimes 1 niij. wide. Teeth 

 five, flat, sharp, spear-head shaped. Mouth-shields very small, diamond 

 shape, and almost totally hidden by the mass of papilla: ai.d spines about 

 them. Side mouth-shields large, meeting within, witii a vaoant space be- 

 tween their enclosed angle and the mouth-shield proper. They carry all 

 the characteristic foliate mouth-papilla?, and are very much larger than 

 the mouth-shield. The lower and inner point of the jaw, which in most 

 Ophiurans is scarcely to be seen, is here quite large, and carries all, or 

 nearly all, the spine-like mouth-papillse. Under arm-places much wider 

 without than within ; outer side curved, with a lateral projection from each 

 corner, which joins the side arm-plate; laterals strongly re-enteringly 

 curved, by the encroachment of the tentacle pores, which are very large ; 

 inner side making a sharp angle ; length of plate (Oth) to greatest breadth 

 .5 : .5. Side arm-plates meeting above and below; above they cover 

 almost the whole surface, the upper arm-plate being reduced to a mini- 

 mum. Upper arm-plates with a curved outer fide; the inner side with 

 a rounded angle ; they occupy only a small spot of about half the width 

 of the arm, between the bases of the arm-spines. Disk uniformly covered 

 with very fine, thin scales, about fifty to a square mm. Scattered over the 

 upper surface are a very few short, delicate spines ; in the lower interbra- 

 chial spaces, just outside the mouth-shield, a group of little flat papil'ac. 

 Arm-spines on joints beyond the disk six; the three upper ones slender, 

 rounded, tapering; the three lower a little flattened and more blunt; upper 

 spines longer; the longest (6th joint) .7 mm. Within the disk the spines 

 have an entirely different form. Second joint with an unbroken row of 

 ten equal, short, flat, scale like papilla?, whereof two are on the under arm- 

 plate, and four on each side arm-plate. Third and fourth joints the same, 

 except that the papilla; get more rounded and longer, and that the fourth 

 joint has only three en each side arm-plate. Tentacle scales of second 

 joint two; of a shape similar to the outer mouth-papilla;, and lying on the 

 side of the pore opposite the under arm-plate. All succeeding joints have 

 but one scale, which lies on the inner angle of the under arm-plate. The 

 two scale-like spines on the under arm-plate disappear beyond the sixth joint ; 

 they may, indeed, be considered tentacle scales just as properly as arm- 

 spines. Some species of Ophioglypha give similar instances. The tentacle 

 scales, except those of the second joint, are flat, oblong, and similar to the 



