76 BULLETIN 82, UNITED STATES NATIONAL MUSEUM. 



Cirriferous. Bearing cirri. 

 Cirriferous nodals. See Nodals. 

 Cirrus facets. See Cirrus sockets. 



Cirrus sockets. The depressions or sockets in the centrodorsal (or hi the nodals) 

 upon which the cirri are situated, and by which they articulate with the centro- 

 dorsal (or with the nodal) (see figs. 1, p. 60, 9, 10, p. 65, 29, p. 71, and 148, 

 p. 220, and pp. 108, 109). 



Closed ring. Of calyx plates, a circlet in which all the plates are in apposition 

 laterally with the neighboring plates of the same series (see fig. 566, pi. 7). 



Close suture. See Suture. 



Column. (1) The linear series of ossicles arising from the center of the circlet of 

 basals; the stem; in the comatulids the column is discarded just distal to the 

 topmost ossicle in early life, and the animal becomes free (see figs. 126, p. 195, 

 127, p. 197, 128, p. 199, 129, p. 201, 144, p. 207, 145, p. 209, 532, 533, pi. 3, 543, 

 pi. 4, and 594, pi. 16, and pp. 108, 228). 



(2) A series of cirrus sockets arranged in a straight line in the dirrection of 

 the dorsoventral axis (see figs. 190, p. 235, 192, 194, 196, 198, p. 237, 200, 203, 

 204, 205, 207, p. 239, 208-216, p. 241, 218, 223, p. 243, 227, 228, p. 245, 558, 

 pi. 5, and 573, 574, pi. 8, and pp. 198-219). 



Columnals. The individual ossicles of which the column is built up; these are often 

 referred to as "stem joints" (see figs. 2, p. 61, 3, p. 62, and 135-143, p. 205). 



Columnar arrangement. Of cirrus sockets; an arrangement of cirrus sockets in 

 lines parallel with the dorsoventral axis of the animal (see figs. 203, 204, 207, p. 

 239 and 208-216, p. 241, and pp. 108, 228). 



Comb. A peculiar comb-like modification of the distal part of the lower pinnules 

 found always hi the Comasteridse, but only rarely in the other families; the 

 outer ventrolateral edge of each segment is produced into a more or less elon- 

 gate spade-shaped or triangular process, which may be repeated on the inner 

 ventrolateral edge. In one of the comasterid genera (Comaster) the combs are 

 not confined to the proximal part of the arms as usual but occur at intervals 

 on the middle and distal pinnules (see figs. 56-58, p. 83, and 59-60, p. 85, and 

 pp. 112-113). 



Combed pinnules. The pinnules which are provided with a comb; in general this 

 term is synonymous with oral or proximal pinnules, bub in several species the 

 combed pinnules are found far up the arms; combed pinnules occur in the Comas- 

 teridse, and, less perfectly developed, in the antedonid genus Solanometra. 



Commissural canals. The canals within the substance of the radials which lodge 

 the circular commissure connecting the axial cord of each radial with those of 

 the radials on either side (see figs. 442, 444, 446, p. 351, 549, 551, 552, 557, 

 pi. 5, and 600, pi. 17, and pp. 350-354). 



Commissure. The circular nerve ring within the radials connecting the axial cords 

 all around the calyx (see fig. 63, p. 89, and pp. 350-354). 



Compound basals. The basal rays, together with the adjacent basal bridges and 

 the interradial portions of the rosette (see figs. 416-427, p. 321 , and pp. 327, 328). 



