1888.] PROF. BELL ON NEW SPECIES OF OPHIURIDS. 283 



distinctive characteristics — minute though some of them may appear 

 to be — seem to justify the formation of a new species for this form. 



The description is drawn up from a single dried specimen. 



Disk distinctly, but not sharply, pentagonal ; arras about four and 

 a half times its diameter ; they are not carinated at their base, nor, 

 on the other hand, markedly flattened ; they taper gradually. 

 Granulation of disk rather coarse, about nine granules to a millimetre ; 

 the radial shields not marked by special depressions. Mouth-shields 

 not divided, irregularly lenticular, the more convex edge being adoral ; 

 side mouth-shields quite small ; the granulation between the mouth- 

 shield and the edge of the jaw is very coarse. Mouth-papillse seven, 

 the penultimate quite twice the size of its neighbours. 



The upper arm-plates have pretty straight edges, and are about 

 twice and a half as long as broad ; the under arm-plates are not 

 quite so much encroached upon by the side-plates as in O. conjun- 

 gens, and are rather more regularly hexagonal ; an aboral notch 

 frequently found in the allied species is not to be seen in the one 

 now under description. The side arm-plates carry ten subequal 

 spines S none of which are as long as the plate that bears them ; there 

 are two tentacular scales near the base of the arm and one further 

 out ; there are two pores between the first and second arm-plates. 



It would be unsafe to form a judgment as to the colour of this 

 species either when alive or as preserved in alcohol ; but it is pro- 

 bably paler than 0. conjungens, and not so much mottled ; there 

 are signs of sets of three joints at a distance of from seven to ten 

 joints from one another being darker than the rest ; this would give 

 a banded appearance to the arms ; the mouth-shields are probably 

 darker than the rest of the oral surface. 



Diam. of disk 100 (ca.) mm ; length of arms 24 mm. 



Hab. Port Jackson ; in coll. B.M. 



4. Ophioglypha amphitrites, sp. nov. (Plate XVI. fig. 6.) 



This species appears to belong to Mr. Lyman's first division of 

 the genus, or those in which the disk is flat and is "covered with 

 imbricated scales. Under arm-plates small, widely separated ; much 

 wider than long beyond the second plate, and thereafter constantly 

 diminishing in size. Arm-comb of more or less needle-like papilla?. 

 Arm slightly flattened, with spines about as long as a joint. Ten- 

 tacle-scales few, beyond the second pair of pores." But it does not 

 appear to be referable to any form yet described. 



Arms three to four times the diameter of the disk. IMouth-papillfe 

 five at the outer mouth-angle, separated by a bare space from the five 

 (two on each side, and one larger central one) which lie just below the 

 teeth, and have almost the appearance of teeth-papillse. Mouth- 

 shield longer than broad, a little constricted in the middle, distal 

 edge rounded, proximal forming an acute angle ; side mouth-shields 

 long and narrow, meeting within. 



First under arm-plate broader distally than pioximally, the second 



^ 0. conjungens may bear nine or ten arm-spinea near the base of tbe arms. 



