542 BtfLLETIN 82, UNITED STATES NATIONAL MUSEUM 



Portions of the radials are just visible in the interradial angles of the calyx. 

 The IBi-j, which are partially concealed by the large centrodorsal, have curved 

 proximal borders and are more or less united laterally. The IBr^ (axillaries) are 

 broadly pentagonal, with concave distal borders. The succeeding di^^sion series 

 are all 4 (3 + 4). The rays divide four, or sometimes five, times. 



The 70-80 arms are about 140 mm. in length. The first brachials are large, 

 partly united with their fellows, and not quite oblong, their outer sides being slightly 

 longer than the inner. The second brachials are somewhat shorter and more nearly 

 oblong. The first syzygial pair (composed of brachials 3 + 4) is square, or just longer 

 than broad. The next 4 or 5 brachials are transversely oblong, their proximal edges 

 having shght basal projections alternately on opposite sides. The following brachials 

 are longer, rather sharply wedge-shaped, with, spiny overlapping distal edges. After 

 the fortieth brachial thev become shorter, blunter, and more oblong and overlap less 

 distinctlv. 



Syzygies occur between brachials 3 + 4, again from between brachials 16 + 17 to 

 between brachials 19 + 20, and distally at intervals of 3-6 (usually 4 or 5) muscular 

 articulations. 



The second ossicles after each axillary bear long pinnules. The first 2 are nearly 

 equal, nearly 30 mm. in length and composed of 70 segments. The size decreases 

 to Pi, which is not quite half as long as Pp. The next 5 or 6 decrease rather more 

 rapidly, and those following increase again. The pinnules as far as the third or 

 fourth brachial have very strong blunt processes on their last 12 or 15 segments. 

 On the next 6 or 8 brachials the terminal comb becomes less and less prominent, and 

 finally disappears altogether. 



The disk is from 30 to 35 mm. in diameter. It bears a few calcareous granules, 

 especially about the anal tube. The mouth is radial, or nearly so. All the arms 

 are groove~d. The dorsal perisome uniting the rays and their divisions is more or less 

 plated as far as the IIIBr axillaries. 



The color in alcohol is brown or reddish brown. 



Carpenter noted that the 2 specimens differ slightly in the number of cirri and 

 in the extent of the bare dorsal pole of the centrodorsal. They also differ in the 

 development of spines upon the brachials and in the extent to which the perisome is 

 plated between the division series. 



A specimen without locality in the Hamburg Museum Carpenter said differs 

 in points of detail from the type at Leyden. It is considerably mutilated, nothing 

 remaining but the calyx, arm bases, and disk. The mouth, as in the type, is nearly 

 radial, though not absolutely so. The centrodorsal reaches 12 mm. in diameter, and 

 the cirri are much longer and stouter than in the type. Some of them reach 35 mm. 

 in length and are composed of 35 segments. The basal segments are very broad, and 

 there are few, if any, that are at all longer than broad. All of the division series are 

 4 (3 + 4). The bracliials have the distal edges slightly raised and somewhat spiny. 

 There are no articular tubercles. The specimen is remarkable for the great length 

 of the lowest pinnules, which may reach 40 mm., but are relatively slender, none of 

 the component segments except the broad basal ones being especially stout. 



