NORTH PACIFIC OPHIURANS IN NATIONAL MUSEUM— CLARK. 151 



rounded corners, longer than wide, broadi}" in contact. Side arm 

 plates moderate, not meeting above or below, at least on base of 

 arm; each plate carries six or seven cylindrical, blunt arm spines, 

 of which all but the lowest are subequal and about as long as the 

 joint; the lowest is decidedly longer than the rest, and near the 

 middle of the arm is fully twice as long as the others. Tentacle 

 scale, single, elongated oval. Color (dried from alcohol), very light 

 gray. 



Locality. — Albatross station 3735, off Omai Zaki, Honshu Island, 

 Japan, 36 fathoms, coarse gray volcanic sand, broken shells, 1 

 specimen. 



Type. — Accidentall}^ destroyed immediately after the illustrations 

 given herewith had been completed. 



It is, of course, a matter of great regret that the unique specimen 

 here described should have met with such an untimely fate, but 



Fig. 61.— Amphiura MicRASPis. x 12. a, from above; 6 from below; c, side view of three arm 

 JOINTS near disk; d, side view of an arm joint near middle of arm. 



nevertheless it seems best to publish the description and figures 

 since the small radial shields, peculiar oral papilljp, and the con- 

 spicuous lowest arm spine combine to make the species one which 

 will be very easily recognized. 



AMPHIURA PYCNOSTOMA, new species.a 



Disk 4 mm. in diameter; arms 22 mm. long. Disk covered by 

 about two hundred coarse scales, among which the six primary plates 

 are rather prominent. Radial shields twice as long as wide, in contact 

 distally, but well separated at inner ends. Upper arm plates some- 

 what hexagonal, with outer corners much rounded, decidedl}' wider 

 than long, broadly in contact. Interbrachial spaces below, well 



a UuKvoc, signifying dosed, and arSfia, signifying mouth, in reference to the way 

 in which the peculiar scales of the first pair of oral tentacle pores close the mouth. 



