KONGL. SV. VET. AKADEMIENS HANDLINGAR. RAND 25. N:0 2. 95 



The radianal is bounded by (1) 1. post. Il, a convex curve, 5 mm.; (2) IBr, of 1. 

 post. arm, a slightly convex curve, 2.75 mm.; (3) os, and perhaps the T-piece, 4 mm.; 

 (4) post. B, G mm. The plate is somewhat swollen, and side 4 presents a broad flat 

 surfaee against which the base closed. 



T-piece is apparently very small, as in C. nitidus. 



Anal structures: x rests on the remains of the T-piece and 011 the r. post. and 

 r. ant. inferradials, and abuts laterally on lin-, and possibly Tax of the adjacent arms. 

 Wlien the arms are closed, x, the next plate. and just possibly part of a third are exposed 

 below the main-axils. 



Arms: 1. ant., — 9 ossieles are preserved. The first brachial rests on the super- 

 radial, just touches the large radials, and abuts in a gentle curve on IBr 15 lax, and IIBi^ 

 of the adjacent arms; its height is 2.2 mm., its extreme width is 6.2 mm. Succeeding 

 ossieles are markedly moniliform; the height of the 7th brachial is 3.5 mm., its extreme 

 width is 4.75 mm., its width at the suture is 3. C mm. 



L. post. arm. — There are two primibrachs. The first is 5-sided; it articulates 

 with the radial below and lax above, the edges being strongly bevelled; it abuts on the 

 first brachial of 1. ant. arm, on the radianal, and, by a very short side, on x; its height 

 is 1.75 mm., being a little more on the right than on the left, and its width is about 

 (>.5 mm. The priinaxil is 5-sided; it articulates below with IBi^ ; parallel to this articula- 

 tion is the slope that articulates with Ilax., which has a length of 5 mm.; the slope on 

 the left is attached to IIBi\ by a very close suture and is 3 mm. long. The succeeding 

 main-axils are seen up to Ylax; they are of the same character as the first; the upturned 

 portion is short, not at a sharp angle to the inter-faeet portion; the suture with the 

 ensuing alpha-brach is always very close and possibly syzygial. 



In the axil-arms the 2nd or 3rd alpha-brachs and the 2nd or 3rd beta-braclis are 

 axillary. The arm-branching is doubtless the same as in previous species. The proximal 

 ossieles of the inner armlets are not seen as they are in C. nitidus; but distally, where 

 the arms are somewhat opened, there may be seen between the large outer branches por- 

 tions of the small inner ones. The outer armlets lie more or less parallel to the 1. ant. 

 arm, and decrease in size as they recede from it; but the difference in size between the 

 1. ant. arm and the adjacent outer armlet is considerable; thus the 4th gamma-brach, 

 which is contiguous with the seventh brachial of the 1. ant. arm, is 2.5 mm. high and 

 2.5 mm. wide. 



Supplementary plates: These are well preserved in the present specimen, both in 

 the hinge and in the wide spaces of the artieular facets between the main-axils. Since 

 their morphological importance is greater than their diaemostic value they have already 

 been described on pages G9, 7<). 



Ornament nil. 



Stem: 44 mm. long and cornposed of 30 ossieles. A sagittal ridge is evident. 

 The axial canal is small. The 5th ossiele from the cup is 2.75 mm. high and about 4 

 min. in diameter; above this the ossieles are rather less in height and a little irregular; 

 below this they lessen in height till in the 20th ossiele the height is 1.5 mm.; the dia- 

 meter remains about the same. The remaining 10 distal ossieles gradually lessen in 



