JAPANESE ^STEEOIDEA. 301 



Liuidia nioroisoana, n. sp. 



(PI. YI, figs. 95-103.) 



I have only one specimen of this species in alcohol. It be- 

 longs to the same group of this genus as the L. aspera of Sladen 

 and the L. hystrix and L. magnifica of Fishee, the first from the 

 Phihppines, and the last two from the Hawaiian Islands. The 

 specimen is ten-armed, with a tolerably large disk of the radius 

 of 23 mm. as against the 194 mm. of the arms, the radial ratio 

 consequently being 8.4. The colour is reddish-brown on the 

 abactinal side, the other side being colourless. The paxilla3 present 

 in general a rough appearance, and those of the two or three 

 rows bordering on the inferomarginals mostly bear each a conical 

 spine at the centre of the tabulum. The paxillae of the arms 

 lying between the three rows just mentioned are conspicuously 

 smaller, and do not bear any prominent spines. On the actinal 

 side also the spines are well developed. 



Inferomarginals, — Except at the bases of the arms the in- 

 feromarginals are very broad, and are the most conspicuous 

 plates on the actinal side, forming the lateral borders of the 

 arms. The fasciolar grooves are very distinct though not deep. 

 The most conspicuous part of the armature of the inferomarginal 

 plates is a transverse series of three or four large conical spines, 

 running along the middle of the plates (PI. VI, figs. 98, 99). 

 Of these the outermost two may be subequal, but more usually 

 the outermost one is conspicuously larger than the others, 

 and together with the similar spines of the other infero- 

 marginal plates, forms a longitudinal series along the margin of 

 the arms ; the next spine lies at the apex of the rounded angle 



