ECHI.>fODERM \TA —CLARK. 535 



-arm-plates oblong, with rounded coi-ners, about two-thirds as long 

 -as wide. Interbrachial spaces below closely granulated. Oral 

 shields somewhat wider than long, with a nearly straight distal 

 -margin, but strongly convex proxiinally. Adoral plates small 

 and bare. Oral plates concealed by a coarse granulation, about 

 30-35 granules on each jaw. Oral papillte about seven on each 

 side, penultimate decidedly largest. Under arm-plates nearly 

 octagonal but with distal angles rounded, a trifle longer than 

 wide ; first under arm-plate triangular, much wider than long, 

 ■without pores between it and second plate. Side arm-plates 

 rather krger, with a strongly convex distal margin, but well 

 separated from each other throughout the whole length of arm ; 

 each plate carries six (very rarely seven) spines, of which the 

 ^lowest is more or less cylindrical and blunt, and about two-thirds 

 .as long as joint ] the others are a trifle shorter, and are flatter 

 and pointed; the upperaiost is clearly the smallest. Tentacle- 

 scales two, the outer decidedly wider than the inner, but, except 

 ■ on basal joints, hardly more than half as long. Colour (dry) 

 very light brown, with a greyish cast on the upper side ; under 

 arm-plates and oral shields neai-ly white ; dorsal side of disc and 

 upper arm-plates, indistinctly clouded with purple, and faintly 

 i marked Avith a fevv very small, round, whitish spots. 



1 specimen from Station 42, Off Wata Mooli, 70-78 fathoms ; 

 coarse sand. 



1 specimen from Station 48. Off Wollonfong, 55-56 fathoms ; 

 sand and mud to rock. 



It is not a little exasperating, after having just completed a 

 careful revision of the genus Pectinura and its allies,^ ^ to find 

 these two specimens, which agree in being unlike any of the 

 -previously known species ! They are nearly related to P. 

 -assimilis, Bell, but the smaller number of arm-spines distinguish 

 them from that species at a glance, for in specimens of assimilis 

 of the same size as the larger specimen of dyscrita, there are at 

 least eight or nine arm-spines on the basal joints. I see no other 

 course open, therefore, than to regard them as representing a 

 previously unknown species. 



OPHIOZONA GYMN0P0RA,i'5 sp. nov. 



(Plate li., figs. 1-3.) 



Diameter of disc, 3 mm.; length of arm, 4 mm. Disc flat, 

 covered by about sixty plates, among which the central dorsal, 



1* Clark— Bull. Mus. Comp, Zoul., lii., 1909, pp. 111-1.32. 



IS 'yiijLivoy=naked-f-7ropos=a way through, a pore, hi reference to the 

 absence of the tentacle-scales. 



