ojioh upper sloping side a single secondary radial which is axillary, 

 and one of them bears upon each up]3er sloijiiig side three tertiary 

 radials and the other hears ii])on one slojjing side three tertiary radials 

 and u})()M tile other, (wo. Ilie Inst of wliicli is axillary and hears upon 

 each upijer side two ((uatfrnary radials. which gives to this ray five 

 arnis. There are, therefore, s(^ventccn arms in this sjiecies. The 

 arm formula is 3+!^ 3 3 3. 



There seem to be only two interradials in each area. The first is 

 medium, in size, for species, in this genus, and tlie second is smaller 

 and cult off from connection with the vault by a uiuon of the radial 

 l)lates. Or. at least, we cannot find any sutures for the small plates 

 that usually unite these areas with the vault. The azygous area is 

 substantially like the other areas. 



The vault is highly convex and bears a short siilicentral proboscis. 



The vault is covered by a few large, plane plates. There are two 



elongated, curved, ovarian a}>erturcs in each interrailial area, and 



two within each radial series which gives to this species twenty 

 ovarian apertures. 



'i'his si)ecies most resembles D. Juiiiimclli, from which it is 

 distinguished by having seventeen instead of sixteen arms. Jt has 

 also an increased number of tertiary jjlates as well as the (piaternary 

 platt\s. Tlu' inlcrradial areas are connected with the vault by two 

 plates in that species, which do not, as it appears, exist in this 

 specie's, 'llu-re are other minor diirerences. 



l''t)iind by (u'o. K. ( Jrceiic in the Hamilton (Jroupncar Cinirles- 

 tdwn. fndiana. and now in the collectii)n of Wm. I"\ E. (lurley. 



KTEUUOC'RINTS TNIII.XNICXSIS n. SJ). 



I'liilc ] I f. Fiji. t.'S. ririr of (I cdlij.r ultoirluij (ill llic j^hilt'n : FiiJ. 



11. Idlcral ricir, slioiriui/ lici)/h{ ofc(i1i/.r: Fkj. ]■'>, ricir 



(if (I silirijicd s/irrimoi In Hie usii'il coiidHion. 



Species snuill. Calyx flat with the exception of raised, rounded, 

 radial ridges. The surface of the plates is dc'licately smdptured. 



The basal plates are small, and form a small, more or less, conical 

 elevation in the interior. The first primary radials are about twice 

 as large as the second. The second are axillary and support on each 

 upper sloping side a serii's of secondary radials. As many as five 

 sec;ondary radials are preserved in some of the rays. There is no 

 other bifurcation of a ray. There are, therefore, only ten arms in 

 this species. The first regular intorradial plate is elongated and has 



