MONOGRAPH OF J.iPANESE OPHIUEOIDEA. 



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closely covered with very fine granules, of which eleven or twelve 

 lie in 1 ram. Radial shields entirely covered over. Interbrachial 

 ventral surfaces and oral angles, including the oral and adorai 

 shields, also covered with granules, which are similar to those of 



Fig. 8b. Ophmroconis monolepls. d. From above. xl5. h. From below. xl2. 

 c. Side view of two arm joints near disk, x 12. 



the dorsal side. Genital slits long, nearly reaching to the disk 

 margin. Six or seven oral papilte on either side, closely set, 

 acute ; the outermost one is pointed inwards, projecting above the 

 next papilla, which is slightly larger than the rest and obtuse. 

 Teeth triangular, not very stout, obtusely pointed. 



Arms about five times as long as the disk diameter, more or 

 less cylindrical, widest at the base, uniformly tapered outwards to 

 a very slender tip. Dorsal arm plates rather small, fan-shaped, 

 with convex outer border, slightly shorter than the corresponding 

 arm joint, wider than long, convex along the median line, so that 

 the arm is keeled as a whole. Lateral arm plates of the two sides 

 meeting above as well as below. First ventral arm plate extreme- 



