NORTH PACIFIC OPHIURANS IN NATIONAL MUSEUM CLARK. 171 



wider than long, barely in contact. Tentacle scales f-vvo, luuisuiilly 

 large and flat, nearly closing the large pores. 



Locality. — AVmtross station 4964, off eastern Japan, lat. 34° b' 30" 

 N.; long. 134° 56' 40" E., 37 fathoms, fine gray sand, mud, bottom 

 temperature 66.6°, 2 individuals without disks. 



Type.— Cat. No. 25633, U.S.N.M., from station 4964. 



It is too bad that this very well marked species shoukl be repre- 

 sented in the collection only by two diskless specimens, for I know of 

 no other species in wliicli typical Amphioplus mouth parts are com- 

 bined with such remarkable tentacle scales and arm plates. It 

 would be most interesting to know the disk structure. 



AMPHILEPIS PLATYTATA, new species." 



Disk S mm. in diameter; arms about 32 mm. in length. Disk 

 excessive] V flat, covei-ed with a smooth coat of about two hundred 



Fig. 



70.— AMPHILEPIS PLATYTATA. X G. «, FROM AliOVE; 1), FROM BELOW; C, SIDE VIEW OF THREE 

 ARM J()INT.S NEAR UI.SK. 



large, thin, rounded scales. Radial shiekls, more than twice as long 

 as broad, well separated within, but just barely in contact distallv. 

 Upper arm plates broadly pentagonal, with somewhat rounded angles 

 and a convex distal margin, twice as wide as long, not in contact 

 except at very base of arm. Interbrachial spaces below, quite naked 

 except for a few marginal scales. Oral shields triangular, with 

 slightly convex sides, a little wider than long. Adoral plates large, 

 wider without than within. Oral plates large, each canv^nng tAvo 

 low, wide, truncate papillae. Teeth nearly triangular. Genital slits 

 very inconspicuous. First under arm plate large, somewhat pentag- 

 onal, with inner lateral margins concave; succeeding plates also 



a nXazurazoc, signiiymg flattest, in reference to the exceedingly flat disk. 



