OF THE MERGUI ARCHIPELAGO. 



101 



tensity of colour varies in different individuals, and usually there 

 is a banded appearance from the colour being lighter on con- 

 secutive plates. The spines are often slightly splashed with light 

 purple. 



Upper arm surface midway is 2 millim. across, and the length 

 of the longest spiue is a millimetre more. 



Localities. Elphinstone Island, King Island, Owen Island. 



Variety 1. Same dimensions as the type, hooks at the 10th 

 joint. Upper arm plates near the disk with the median aboral 

 projection, sometimes a white line along part of the length in 

 some plates. 



Variety 2. General splitting of the upper arm-plates, near the 

 disk, in some arms ; upper arm-plates entire far out. 



Variety 3. No splitting of the upper arm-plates, stumps 

 extending in a close multitude below to the mouth-shield. 



Variety 4. Stumps on the first upper arm-plate. 



Genus Ophiocampsis, gen. nov. 



Disk and large close radial shields covered with skin carrying 

 a few thorned stumps. Ends of radial shields and the long knobs 

 of the genital plates on the top of the arm ; genital scale shorter, 

 broad and large, with a curved border. Below, the disk has a 

 plain skin carrying large, separate, irregular scales each with a 

 thorny stump, crowded and large at the tumid interbrachial 

 space and ceasing near the mouth-shield. Teeth, tooth-pap illse, 

 no mouth -papillae, and no tentacle-scales to the arms. Tentacles 

 large, long, and papillose, coming out from the lower part of the 

 arm. No upper arm-plates. A minutely squamous skin covers 

 the broad, arched upper surface of the arm, and part of the sides 

 of the arm and also the bases of the projecting flap-like side arm- 

 plates. Spines long, slender, spinulose, glassy, seven to five in 

 number, the lowest being a hook. Lower arm-plates narrow 

 orally and aborally, widest in the midst, and with a projection at 

 the sides. Arms about ten times the length of the diameter of 

 the disk, rounded above and at the sides and rather flat below, 

 can assume a vertical bending. Arm-bones with large umbo and 

 without a median articulating peg. 



Ophiocampsis pellicula, sp. nov. (Plate IX. figs. 20, 21 ; 

 Plate XI. fig. 40.) 



The disk is pentagonal, the scales at the margin are stout, 



