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brought about a depressed triangular area in each interradius with 

 smaller paxilla?. Of the coronal spinelets, the peripherals and the 

 centrals are usually well distinguished both by their form and 

 position, the centrals being shorter (PI. X, fig. 154). On one of 

 the largest paxillœ near the centre of the disk, there may be as 

 many as twenty peripherals and eleven centrals. Some of the 

 paxillaß bear pedicellaria) which are, so far as I have' observed, 

 always bivalvate, and are usually formed by the transformation of 

 peripheral spinelets. Each valve is curved and flattened and is 

 apposed to its fellow face to face (PL IX, fig. 152). I have never 

 seen a paxilla with more than one pedicellaria. Towards the tip 

 of the arms the paxillar area becomes very narrow, and only a 

 single paxilla is in contact with the terminal plate (PI. X, fig. 



153). 



The papular pores are very numerous and are uniformly 

 distributed in the elevated radial bands already mentioned. They 

 are however absent fi'om the apical parts of the arms. 



Madreporite. — The madreporite is tolerably large and con- 

 spicuous, being elevated to about the level of the surrounding 

 paxillœ (PL X, fig. 155). It is nearly twice as far removed from 

 the margin of the disk as from the centre. 



l^cr mined plate.— The terminal plate is fairly large and nearly 

 oval in outline (PL X, fig. 153). 



Locality.— My specimens are from a depth of 270 m. in 

 Uraga Channel and 550 m. off Misaki. 



Two specimens in S.C. 



This species stands near to M. elegans Ludwig and M. tenellus 



FiSHEK. 



