62 



BULLETIN 82, UNITED STATES NATIONAL MUSEUM. 



raya and receiving its ambulacra from the ray to its left. In the genera 

 Promachocrinus and TTiaumatocrinus anal x and all the other interradialsgive 

 rise to additional (interradial) post-radial series so that a normally 10-rayed 

 animal results (see figs. 113, 114, p. 181, 115-117, p. 183, and 122, p. 191). 



Anambulacral. Bordering the ambulacral grooves. 



Angles of the calyx. A term sometimes enployed to designate the points of union 

 between the interradial sutures and the suture between the centrodorsal and 



CROWN 



CALYX' 



(PR1MIBRACHIAL AXILLARY) 



(FIRST PRIMIBRACH) 

 S 



SALS (B) 



FIG. 3. LATERAL VIEW OF A SPECIMEN OF ILTCRINUS COMPLANATUS FROM "ALBATROSS" STATION 3783; THE MAJOR PART OF 



THE COLUMN AND FOUR OF THE ARMS ARE OMITTED. THE CALYX, CONSISTING OF THE BASALS AND THE KADIALS, IS HEAVILY 

 OUTLINED (DRAWING BY THE AUTHOR). , 



the radial circlet in the comatulids. It is here that the outer ends of the basal 

 rays appear (see fig. 415, p. 319). 



Antepenultimate segment. Of the cirri; the segment immediately preceding the 

 penultimate (see figs. 314-317, p. 273, and pp. 278-283). 



Anterior arm. The arm situated directly opposite the anal area; in the endocyclic 

 species the ambulacrum leading from this arm across the disk would, if con- 

 tinued beyond the mouth, pass through the anal tube; in the exocyclic species 



