252 



s. goto: 



" rigid " and " rays of moderate length." It appears to me not 

 necessary to set up a new genus for the sake of these characters. 

 In liaving the inferomarginal plates destitute of any specialised 

 spines this species is like D. anoplus. 



Dipsacnster grandlss iniiiSf u. sp. 

 (PI. Yin, figs. 136-139; PL IX, figs. 140-141.) 



This is a very characteristic species, different from any one of 

 the genus yet described, the most striking feature being the softness 

 of the body, especially on the abactinal side. Its great size is also 

 remarkable. I have only one specimen, in which the marginals 

 are more or less disjointed, owing partly to maceration, but 

 more, as I take it, to the softness of the intervening tissue. The 

 whole body is very flat, and a slightly elevated carinal ridge is 

 seen to be present in each arm, all meeting at the centre of the 

 disk, so that there is left a depressed area in each interradius, 

 similarly as in some species of Pentagonaster. The disk is very 

 large ; the arms are very broad at the base and rounded at the 

 end ; so that the body is regularly and broadly 5 -radiate. 



The mouth is largely open in my specimen, and the am- 

 bulacral furrows are also very wide ; but these conditions evident- 

 ly depend much on the contraction of the muscles. The am- 

 bulacral feet are very large and appear to be provided with a 

 small sucker. My specimen measured as follows : 



Supeiwnarginals. — These are very conspicuous, but do not 

 form the lateral forder of the body, except near the tip of the 



