166 
broad as long. The transition joint and those following bear 
distally on the dorsal end a transverse ridge, furnished with 
usually six rounded teeth; distally this ridge gradually becomes 
narrower, after about twenty joints becoming merely a pair of 
teeth, and after about eight joints more a single dorsal spine; 
with the decrease in width of the transverse ridge the dorsal sur- 
face of the joints becomes more and more carinate, at first only 
in the distal portion, but gradually more and more of the surface 
is involved, so that, viewed laterally, there appears to be a series 
of dorsal spines, which at first rise sharply from the distal end 
only, but later progressively involve more and more of the dorsal 
surface, at the same time taking on a rounded character dorsally; 
opposing spine terminally situated, erect, or pointed slightly for- 
ward, stout, arising from the whole surface of the penultimate 
joint, and equal to about half the diameter of that joint in height; 
terminal claw considerably longer than the penultimate joint, stout, 
slightly curved. The radials are much produced in the interradial 
angles, entirely separating the bases of the IBr,; the rays are 
deep, rounded dorsally, and very widely separated; the first joints 
after each axillary are united in the earlier axillaries for about 
their proximal half, their distal halves diverging widely; in the 
later axillaries progressively more and more of the inner edge of 
the joints is involved, until in the free arms we find the first 
brachials usually entirely united interiorly. The arms and division 
series are rather sharply rounded dorsally, deep and laterally 
compressed; the first brachial is broader than long, the second 
squarish, the third and fourth (syzygial pair) oblong, longer than 
broad, the next seven or eight oblong, nearly twice as broad as long, 
then triangular, over twice as broad as long, after the proximal 
third of the arm wedge shaped and very short. P, 22 mm. long. 
not particularly stout (though much the stoutest pinnule on the 
arm), evenly tapering, with thirty-three joints, the first short, the 
third "squarish, the following about half again, later nearly twice, 
as long as broad; P, 3.5 mm. long, delicate and weak, evenly 
