MONOGRAPH OF JAPANESE OPHIUEOIDEA. 



121 



Two specimens ; off Oshima, Sagami Sea ; 75-85 fathoms. 



Diameter of disk 6 mm. Length of arras 34 ram. Width of 

 arms at base 1.5 mm. 



Disk pentagonal, with nearly straight or shghtly convex 

 interbrachial borders, flat, soft, closely covered with fine granules, 

 of which eight or nine are contained in 1 mm. Radial shields 

 entirely covered over, very small, bar-like, separated from eacli 

 other. Interbrachial ventral 

 sm-faces similar to the dorsal 

 side, but fi'ce of grannies 

 and covered with fine scales 

 in the inner parts. Genital 

 slits long, nearly reaching 

 the disk margin. 



Oral shields small, rhom- 

 boidal, with convex inner 

 sides and rounded outer 

 angle, nearly as long as, or 

 slightly longer than, wide, 

 joined with the first lateral 

 arm plates. Adorai shields 

 small, triangular, pointed 

 inwards, meeting with each 

 other. Five or six oral pa- 

 pilla? on either side of each 

 jaw ; the outermost two are 



flat, leaf-like and protect the second oral tentacle pore, while the 

 others are very narrow and acute ; the innermost one, which 

 forms a pair with that of the other side, is infradental. Four or 

 five teeth in a single vertical row, more or less stout, obtuse. 



Fig. 31. Ophiacantha hisquamata. x8. a. Fi-om 

 above, h. From below. c. Arm spines of one 

 side of an arm joint near disk. 



