110 Transactions. —Zoology. 



shields were forming, in others the scaUng was more advanced 

 and the discs full size. They were so delicate that it was very 

 difficult to handle them without breaking them to pieces, and 

 when taken out of spirit the discs collapsed completely, as 

 if they were only covered with skin, the scaling not being 

 sufficiently formed to give any support. One or two of the 

 arms of several specimens had also been broken off and were 

 partially restored. 



Amphiura rosea, sp. nov. Plate IX. 



Disc small, slightly tumid, roundly subpentagonal in form, 

 with constrictions in the interradial spaces, covered above 

 and below with rather coarse, circular, overlapping, very 

 irregular scales, among which the primaries can usually be 

 made out ; scaling on the interradial spaces below more 

 regular and finer than above. Eadial shields long and 

 narrow, bluntly pointed within, meeting without (in some 

 specimens they do not quite meet), separated within by a 

 wedge of two or three long narrow scales ; they do not reach 

 the edge of the disc, but are separated from it by a few 

 irregularly-shaped scales. Two short, stout, bluntly-pointed, 

 rounded mouth-papillae at the apex of the mouth-angle, and 

 one short, stout, and bluntly -pointed on either side at the 

 base of the mouth-angle. Five roundish, flattened teeth, the 

 ends truncated or bevelled, the uppermost longest and diver- 

 gent, the lowermost smallest and sometimes pointed, resem- 

 bling a mouth-papilla. Mouth-shields rather large, circular in 

 form, usually with a slight peak within ; madreporic shield 

 distinct, and a little larger than the others. Side mouth- 

 shields trigonal, with re-entering curves, the longest angle 

 within where they do not meet, Arms long, slender, and 

 regularly tapering. Upper arm - plates transversely oval. 

 First under arm -plate irregularly hexagonal, small, often 

 indefinite in shape, those beyond pentagonal, a truncated 

 angle within, and a slightly re-entering curve and rounded 

 angles without. Side arm-plates with prominent spine-crest, 

 meeting neither above nor below. Arm-spines rather slender, 

 cylindrical, tapering, divergent, four sometimes five near the 

 disc and three on the outer part of the arms, the two lower 

 ones rather longer than the upper. Two very minute ten- 

 tacle scales, one on the under arm-plate, the other on the 

 side arm-plate, sometimes only one on the under arm-plate. 



Colour in life often a generally-rosy red ; sometimes the 

 disc is grey or purplish-grey, and brownish towards the centre 

 above. The arms are often grey or reddish-brown near the 

 disc— this colour extends to a greater distance from the disc 

 on some of the arms than on others even in the same sj)eci- 

 men — and light-red or white beyond. In a number of speci- 



