62 



BULLETIN 82, UNITED STATES NATIONAL MUSEUM. 



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

 Promachocrinus and TTmumatocrinus anal x and all the other interradials give 

 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). 



Anamhulacral. — Bordering the ambulacral grooves. 



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

 between the interradial sutures and the suture between the centrodorsal and 



CROWN, 



CALYX' 



Br/(PRIMIBRACHIAL AXILLARY) 



I 9ti (FIRST PRIMIBRACH) 



lALS 

 SALS (B) 



Flo. 3.— Lateral view of a specimen or Ilycrinus complanaivs from "Albatross" Station 3783; the major part o» 

 the colum.v and four of the arms are omitted. the calyx, c0s3i3tinq of the bisals and the radiai^s, is hea\'ily 

 outlined (deawino 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 immediateh^ 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 endocychc 

 species the ambulaci-um leading from tlus arm across the disk would, if con- 

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



