180 



AIÎT. 2. — H. MATSUMOTO : 



specimens, but coarse and irregular in the other. The oral papilla) 

 are usually five on either side, but four in some of the oral 

 angles. The outermost papilla is very small. The disk spines 

 are rather more numerous than in Claek's type. 



Amx>hiacantha dividuaf sp. uov. 



One specimen ; locality unknown, probably Sagami Sea. 

 Diameter of disk 3 mm. Length of arms 15 mm. Width of 

 arms at base 0.7 mm. 



Disk subpentagonal, with slightly convex interradial borders, 

 covered with very fine, imbricating scales and scattered spines, 

 which are very short, conical and obtuse. Radial shields very 



small, subtriangular, with the 

 adradial side longest, about 

 twice as long as wide. Inter- 

 brachial ventral surfaces 

 covered also w^ith imbricating 

 scales, which are somewhat 

 finer than those of the dorsal 

 side ; without any spines. 

 Genital slits long. 



Oral shields oval, or 

 rather rhomboidal with round- 

 ed angles and convex sides, 

 distinctly longer than wide, 

 wider without than within. 

 Adorai shields triangular, long, 

 rather narrow, tapered in- 

 wards to an acute point, not 



Fig. 47. Amphhicantha dividua. xl6. a. From 

 fibove. h. From below, c. Side view of two arm 

 joints near disk. 



