22 OPHIOFLAX UUNGMANI. 



OPmOPLAX gen. nov. 



Teeth ; no tooth-papilla? ; numerous mouth-papillae. Scaling of disk beset 

 with granulation. Arms long and rather stiff Arm-spines few and smooth, 

 arranged on the ridges of the side arm-plates. One very large tentacle-scale 

 on the side arm-plate, and others, minute, on the under arm-plate. Two 

 long genital openings in each interbrachial space. 



The genus stands near OpJdocnida, hut is distinguished by the numerous 

 mouth-papilla 1 arranged as in Ophiura, and by the singular tentacle-scales. 



Ophioplax Ljungmani sp. nov. 

 PI II. f. /.;. 25. 



Special Marks. — Interbrachial spaces below and margin of disk minutely 

 granulated ; upper surface finely scaled, and with small, separated radial- 

 shields. One large and three minute tentacle-scales. Arms pretty long 

 and rather stiff 



Description of an Individual — Diameter of disk, 6""" . Width of arm without 

 spines, 1.7 mm '. Length of arm, C>0 mm . Mouth-papilla* five on each side, and 

 one under and similar in form to the teeth. The papilla' are flat and 

 crowded: the one next the outermost much wider than the others. Mouth- 

 shields small, egg-shape, with the point inward ; length to breadth .8 : .7. 

 Side mouth-shields very small and narrow: joining the side arm-plates with 

 their outer ends ; not meeting within. Under arm-plates rather wider than 

 long, with a curve without, an obtuse angle within, and re-entering curves 

 on the Bides; length to breadth. .7 : .8. Side arm-plates nearly meeting 

 below, but well separated above. Upper arm-plates much wider without than 

 within; the outer side curved ; the lateral sides straight and sloping towards 

 the median line; length to breadth, .7 : 1.4. Disk finely scaled above, sis 

 scales in the length of a nun., where they are finest. The margin and under 

 Burface covered by a minute granulation, about sixteen grains in the length 

 of a mm Radial shields small, irregularly oval, widely separated l>\ three 

 or four parallel lines of scales ; length to breadth, I : .4. Arm-spines three, 

 of Dearly equal lengths; slender, rounded, Bmooth, tapering: the longest. 

 .S mm - One very large, nearly oval tentacle-scale standing on the margin 

 of the Bide arm-plate: and three minute ones arranged along the lateral side 

 of the under arm-plate. The tentacles are smooth and moderate!} stout. 



