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is less typic<al, the pLates are entirely covered with close, flat gi-anules and 

 measure in the inteiTadins 4 mm. by 4 mm., being less regular in size and 

 not at all tumid. The tliickness of the edge of the disk is 5 mm., which 

 includes the height of the combined plates. In B the plates are very 

 regular, 5 mm. long by 6 wide, and the edge of the disk is 8 mm. thick. 

 The superomarginals are strongly tumid, but entirely covered with granules 

 except for a few distal plates. In A there are forty-two to forty-four 

 superomarginals and about fifty inferomarginals to a side of the pentagon ; 

 in B thirty-six superomarginals and forty-two inferomarginals. In typical 

 jajponicus as described by Sladen the sm'peromarginals all had an extensive 

 tumid bare space on the abactinal sm-face, and the inferomarginals a smaller 

 one on the actinal surface. The size of tliis spot is variable even when it 

 is present. In my Misaki specimen the spots are smaller than those 

 described by Sladen. One of the Washington examples lias the bare spaces 

 (on superomarginals only) about as in the Misaki specimen ; tlu'ee others 

 lack them. Out of twenty-four specimens from station 3608 only three have 

 a bare spot on the superomarginals and inferomarginals. A small specimen 

 from 3331 has fairly large tvunid bare spots, while a large emample (' B ') 

 lacks them. The shape of the plates is variable. In specimens with large 

 marginals the width is greater than length, but when the plates are small 

 and not tmnid the proximal plates may be square or even longer than wide. 

 The extreme in this respect is a specimen from station 4775 wliich has prox- 

 imal plates 4 mm. long by 3.25 wide. Japanese s^Decimens vary in this 

 respect, as the type had longer proximal superomarginals than tlie Misaki 

 example, wliich has the plates decidedly wider than long tln'oughout. A 

 remarkable variation is exhibited by a specimen from 4774, wliich has the 

 marginal plates slightly concave, the ti'ansverse sutures being on the summit 

 of a tumidity. The number of pedicellarise on the superomarginals varies 

 greatly, two or three are commonly present, sometimes thi'ee or four on all 

 except the most distally situated. The inferomarginals sometimes lack 

 pedicellaria3, but usually most of the plates have one or even two which are 

 slightly larger than the superomarginal ones. 



