552 BULLETIN 82, UNITED STATES NATIONAL MUSEUM 



The ends of the basal rays are visible as small tubercle in the angles of the calyx 

 just beneath the ends of the radials. Deep but very narrow subradial clefts are 

 present. 



The radials are visible only in the interradial angles where their anterolateral 

 angles form a narrow and rather high triangle in the middle of the base of which is 

 situated the end of the basal ray. The IBri are extremely short and band-like, in the 

 midradial line almost completely hidden by the centrodorsal. Their proximal lateral 

 angles are just in contact above the triangle formed interradially by the anterolateral 

 portion of the radials. From this point of contact the lateral sides, which are very 

 short, diverge at a right angle. The IBr 2 (axillaries) are short, from somewhat more 

 than twice to three times as broad as long, triangular, with the anterior sides moder- 

 ately concave. The lateral angles project for some distance beyond the anterolateral 

 angles of the IBr b and the proximal border of these lateral angles makes approximately 

 a right angle with the lateral borders of the IBr^ All 10 of the IIBr series are 4 

 (3 + 4). They are strongly and evenly rounded dorsally, interiorly quite and exteriorly 

 almost in lateral contact, there being only a narrow strip of perisome visible beneath 

 the bases of the adjacent P D , which are in lateral contact. There are 19 IIIBr series, 

 all of which are 4 (3 + 4). These resemble the IIBr series. The 2 arising from each 

 IIBr series are in close contact interiorly. The 2 on either side of the miradial line 

 are separated only by the bases of the P D . Those on the outermost sides of the post- 

 radial series are separated from their neighbors by usually about half their width. 



The 39 arms are 130 mm. long. The earlier brachials, beyond the proximal 

 discoidal brachials, are triangular, about half again as broad as the longer side, after 

 the proximal third of the arm becoming very obliquely wedge-shaped, and after the 

 middle of the arm shorter, nearly twice as broad as the longer side, and distally longer 

 again. The distal edges of the brachials are rather strongly produced and are armed 

 with very numerous minute spines which become larger and stouter in the outer half 

 of the arms. 



The first brachial syzygy is always between brachials 3 + 4, and the first pinnule 

 is always on the second brachial. 



The earlier segments of the pinnules on the division series bear high carinate 

 processes which are usually shaped like a thick T, and the opposite side of the segment 

 is similarly produced. On PI the side of the basal segments toward the arm tips, 

 beyond the first, is produced into a high narrow process of which the height is equal 

 to about half the width of the segment which bears it and the width is equal to some- 

 what less than half the length of the segment. The processes on the second and third 

 segments are more or less T-shaped with a more or less sharp crest parallel to the axis 

 of the pinnule. Those on the succeeding segments are transversely broadened and 

 thickly studded with short spines. After about the eighth segment these processes 

 very slowly decrease in height and disappear after about the middle of the pinnule. 

 Soon after this this border of the segments again slowly rises into a hump crowned 

 with numerous short spines. As this hump increases in height it gradually moves 

 to the outer side of the pinnule and becomes transformed into the teeth of the terminal 

 comb. The terminal comb of P! has about 16 teeth which are high, practically oblong, 

 and are separated from each other by about their own width. The earlier segments 



