58 BULLETIN 82, UNITED STATES NATIONAL MUSEUM 



The radials are about twice as broad as long, in close apposition laterally, with 

 the distal border moderately concave. The dorsal profiles of the radials on opposite 

 sides make an angle of about 90 with each other. The distal half of the radials is 

 slightly turned outward. The IBri are of about the same length as the radials or 

 very slightly longer, somewhat over twice as broad as long, with the distal border a 

 broadly obtuse angle and the anterolateral angles broadly rounded and slightly 

 everted. The IBr 2 (axillaries) are half again as broad as long, pentagonal with the 

 lateral borders about as long as those of the IBri, the proximal border a broadly 

 obtuse angle fitting in to the corresponding angle on the distal border of the IBr], 

 and the distal sides slightly concave. It is moderately convex and smooth dorsally. 

 The proximal lateral angles are sb'ghtly everted. 



The 10 arms are about 27 mm. long. The first two brachials are wedge-shaped 

 with the outer border not quite twice as long as the inner. The first syzygial pair 

 (composed of brachials 3+4) is oblong, about as long as broad. The next three 

 brachials are oblong, about twice as broad as long, those following becoming wedge- 

 shaped and after two or three more very obliquely wedge-shaped and longer than 

 broad, in the distal part of the arm two or even three times as long as broad, and 

 somewhat constricted centrally. 



The proximal portion of the animal is much compressed, the profiles of the IBr 

 series and arm bases diverging at an angle of about 45. The IBr series are in close 

 apposition and narrowly wall-sided. Beyond the first brachial the ossicles become 

 much more deeply wall-sided, the flattened side of the seventh brachial extending 

 inward to a depth greater than the length of the ossicle, reaching to about the end of 

 the third segment of the pinnule on the preceding brachial. The wall-si dedness is 

 continued as far as the ninth or tenth brachial. Up to this point the arm, as viewed 

 dorsally, is stout, but from here on it tapers rather rapidly, soon becoming very 

 slender. 



Syzygies occur between brachials 3+4 and 9 + 10 and distally at intervals of 2 

 muscular articulations. 



PI is 2 mm. long with 6 segments, stout at the base and tapering rather rapidly to 

 the tip, stiff and styliform. The first segment is twice as broad as long, the second is 

 somewhat broader than long, the third is somewhat longer than broad and tapers 

 slightly distally, the fourth is about twice as long as the median width and tapers more 

 rapidly, the fifth is about twice as long as broad with the sides almost parallel, and 

 the last is much smaller, scarcely longer than broad. P a is similar with the same num- 

 ber of segments, but only about two-thirds as large. P 2 is longer, about 2.2 mm. long, 

 with 8 segments and is evenly curved distally; it is about as stout as P, basally but 

 tapers more gradually. P 3 seems to resemble P 2 but is somewhat more curved. The 

 genital pinnules, which are farther out on the arm than usual, have the third and fourth 

 segments much broadened to protect the gonads, and the fifth wedge-shaped. The 

 distal pinnules are exceedingly slender and hairlike with much elongated segments. 



Conspicuous large dark sacculi are abundant on the pinnules. 



The perisomic deposits in the pinnules consist of slender rods bent near the middle 

 at an angle of about 120 and usually roughened at the larger end, together with 

 short, straight, and apparently smooth rods. Broadly speaking, they are essentially 

 similar to the deposits of Oligometrides adeonae (see Part 2, p. 246; fig. 793, p. 372), but 



