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arms than in tlio disk, wliere they are of irregular form and size, 

 and being covered over witli relatively coarse granules, the in- 

 dividual plates are in this part i)articularly difficult to make out 

 from the surface. On either side of the ambulacral furrow there 

 is a series of roundish or almost square plates for the entire 

 length of the arms, which becomes merged into the general pave- 

 ment of the ventral surface of the disk. A second row can also 

 be made out, but this is not so i-egular ns tlie first one. and 

 terminates at a short distance from the tip of the arms. A third 

 very short row can also be distingnished at the base of the arms. 



There are manv roundish or transverselv elongated, valvate 

 pedicel I arioG on the ventrolateral plates, which are most numerous 

 on the plates on either side of the ambulacral furrow and on -those 

 forminij: the interradial areas. Tn the latter, liardiv anv are to be 

 obserxed near the inferomarginal plates. In the longitudinal series 

 on either side of the ambulacral furrow, there may be as many 

 as three or four on one plate, mostly close to the furrow. 



Abactlnal side. — The lophial tubercles are well developed and 

 conical and armed with a conical si)ine at the tip. in my speci- 

 men there are five of them on each of the four of the arms and four 

 on the lifth. The adcentral tubercles are conspicuously larger 

 than those of the arms and are provided with two conical spines, 

 one at the tip and the other, which is smaller, on the outer side 

 of each tubercle, about half way between the tip and the base. 

 'Vho adcentral tubercles enclose a (.'entrai area, in which five de- 

 pressed ridges can be made out radiating from the centre to each 

 tubercle. The adcentral tubercles themselves are connected with 

 one another by similar ridges running between them. The space 

 l)etween the adcentral, Bell's apical, and the first lophial tubercle 



