118 Mr. A. H. Clark on @ 
the remainder of the dorsal surface of the disk ; few or none 
of the scales in this area bear spines. 
The interbrachial areas below and on the sides of the disk 
are covered with small rounded imbricating scales which do 
not bear spines. 
The oral shields are, roughly, triangular ; the inner angle 
is slightly more than a right angle; the outer angles are 
very broadly rounded; the median third of the distal 
border is occupied by a rather high, rounded, posterior 
process. 
The side mouth-shields are not quite in contact interiorly ; 
they are narrow, with the proximal and distal borders 
diverging only very slightly, the lateral angles somewhat 
produced, and with a narrow posterior process enveloping 
the broadly rounded outer angles of the oral shields. 
The mouth-papille are five (rarely six) in number ; the 
innermost is more or Jess spatulate, about twice as long as 
the maximum width, broadly rounded distally ; the three 
following become progressively more and more slender; the 
outermost is broader again (about of the same proportions 
as the second) with the outer part more or less bent toward 
the apex of the jaw. 
One or two tooth-papillz may be present. 
The upper arm-plates are fan-shaped, broader than long, 
with produced lateral angles and a rather sharply rounded 
distal angle ; they are separated from each other the entire 
length of the arm by the union of the side arm-plates. 
The arm-spines are from seven to nine in number, slender, 
very strongly flattened, and very finely spinous ; the two 
uppermost are the longest (3 mm.in length on the proximal 
segments), the others decreasing in length and becoming 
very slender. 
The second under arm-plate is slightly broader than long, 
with the distal border gently convex ; the following increase 
very slowly in length, so that the fifth is about as long as 
broad with a strongly and evenly convex distal edge, and 
the remainder are slightly longer than broad with an almost 
semicircular distal border and the proximal border in the 
form of an obtuse angle, delimited by the distal ventral 
borders of the side arm-plates. 
There is one broad, leaf-like, sharply pointed tentacle- 
scale with serrate edges ; over the first two-or three arm 
tentacle-pores there are two scales, narrower and less pointed 
distally than those beyond, the inner the smaller. 
Type. Cat. no. 38582, U.S.N.M., from ‘ Albatross ’ 
Station 2818, among the Galapagos Islands, in 392 fathoms. 
