336 BULLETIN 82, UNITED STATES NATIONAL MUSEUM 



The cirri are XXI, 15-17. The first three segments are short, those following 

 elongate. The longest are the fifth, sixth, and seventh, which are about 2 mm. in 

 length. The profile of the dorsal edge of the cirri is proximally smooth but distally 

 somewhat serrate, as in the distal portion the surface of the segments is somewhat 

 produced at the distal end. The penultimate segment bears an opposing spine. 



The radials are not visible. The IBrj are short; the proximal border has four 

 rounded processes, two lateral above the interradial processes of the centrodorsal and 

 two median above the border of two cirrus bases; the distal edge is deeply incised by 

 the proximal process of the axillary. On the dorsal surface there is a moderately sharp 

 median elevation. Laterally the IBrj are in close contact. The IBr 2 (axillaries) , more 

 rhombic than pentagonal, show a strong proximal process incising the IBr] which on the 

 surface of the axillaries is sharpened in the form of a keel reaching its highest point 

 on the synarthrial tubercle which it forms with the IBr^ The axillaries are laterally 

 free and have sharply flattened sides. All the 10 IIBr series are 4(3+4). The IIBr 2 

 has a proximally directed dorsal process which incises the distal edge of the IIBr! and 

 forms the summit of a second synarthrial tubercle. The IIBr series have sharply 

 flattened sides. There is a single IIIBr 2(1+2) series. 



There are 21 arms about 150 mm. long (Hartlaub inadvertently gave the expanse 

 as 30 mm. instead of 30 cm.). Only the two or three earliest brachials are rectangular; 

 the second is somewhat shorter than the first, broader than long. The brachials then 

 become bluntly wedge-shaped, then gradually triangular, as broad as long, toward the 

 tips of the arms bluntly wedge-shaped again and at the same time longer. 



The first syzygy is between brachials 1 +2 except on a single arm arising from a 

 IIBr axillary, on which it is between brachials 29+30. The position of the second 

 syzygy is variable. Hartlaub found it between brachials 26+27, 31+32, 34+35, 

 35+36, and 42+43. Two especially well preserved arms arising from a IIBr axillary 

 show the disposition of the following syzygies, which occur at very varied intervals. 

 In one the second syzygy is between brachials 42+43, those following between brachials 

 53+54, 61+62, 66+67, 74+75, 86+87, 96 + 97, 102 + 103, and 123 + 124. In the 

 other the second syzygy is between brachials 26 + 27 and those following are between 

 brachials 43+44, 52 + 53, 61 + 62, 68 + 69, 77+78, 99 + 100, 118 + 119, 127 + 128, and 

 132 + 133. 



P D is 11 mm. long with about 30 segments of which the first four or five are some- 

 what stalked and broadened, though not strikingly differentiated from those following. 

 The succeeding pinnules are 6-7 mm. long with 15-18 segments of which the two first, 

 as in all the following pinnides, are short. P 3 bears a prominent gonad. The pinnule 

 segments over the gonad are always broadened. The length of the genital pinnules 

 varies. They are usually 5-6 mm. long with 9-14 segments. Distally the length of the 

 genital pinnules appears gradually to decrease, but this cannot be determined with 

 certainty because of the poor state of preservation. At about the twenty-eighth 

 brachial the pinnules with prominent gonads stop. From about the thirty-sixth bra- 

 chial, where they measure about 5 mm. in length, the pinnules increase in length again. 

 In the distal third of the arms they are about 8 mm. long. 



The disk is 12 mm. in diameter, rather deeply incised. According to Hartlaub it 

 shows the ambulacral plating and ornamentation of angusticalyx as given in Car- 

 penter's figures. 



