228 



AET. 2. — H. MATSUMOTO 



Diameter of disk 15mm. Length of arms 35 mm. Width of 

 arms at base 1.8 mm. 



Disk rather flat, covered by the large radial shields and rather 

 coarse, partly imbricated and partly tessellated scales. The scales 

 are covered by skin, so that they are very inconspicuous, especial- 

 ly inside and outside the radial shields, where they are finer than 

 between the radial shields. There are two or three rows of them 

 in each interradius, whore they are coarse, irregular, polygonal, 



and tessellated. Eadial 

 shields large, triangular, 

 with acute inner angle, 

 longer than two-thirds 

 the disk radius, twice as 

 long as wide, those of a 

 pair separated from each 

 other by a single row 

 of oblong, quadrangular 

 scales, three to five in 

 number. Interbrachial 

 ventral surfaces covered 

 by a soft, naked skin. 

 Genital slits large. 



Oral shields small, 

 quadrangular, or rather 

 pentagonal, very wide 

 and short, more than 

 twice as wide as long, 

 Adorai shields very small, 

 quadrangular, joined within. The oral and adorai shields have 

 chagreened external surfaces, which are covered, by skin. Buccal 



Fig. 66. OpMomam kmwkoi. x4. a. From above, h. 

 From below, c. Side view of three .arm joints near 

 disk. 



with a very large inner angle 



