PART 5 



A MONOGRAPH OF THE EXISTING CRIXOIDS 



733 



The radials are even with the rim of the centrodorsal in the midradial line, but 

 extend well up in the interradial angles, where their distal angles are separated by a 

 notch. One radial is malformed, divided into three swollen parts, as indicated on the 

 right in fig. 46,a. The IB^ are very short, about eight times as broad as the median 

 length with the distal edge slightly concave in the middle, rather strongly everted and 

 armed with fine spines laterally. The lateral borders are somewhat convergent and 

 slightly convex and are widely separated from those of their neighbors. The IBr 2 

 (axillaries) are rhombic, with the two proximal sides slightly and the two distal sides 

 strongly concave; they are about half again as broad as long; the distal angle is pro- 

 duced and narrow. The lateral angles of adjacent IBr : meet over the broad gap between 

 the lateral borders of the IBr!, forming a conspicuous pore. The distal edges and the 

 outer portions of the proximal edge are everted and finely spinous. 



The 10 arms are about 50 mm. long. From the proximal side of the IBri to the 

 second syzygy (9+10) is 9 to 9.5 mm. and the width at the first syzygy (3 + 4) is 1.5 

 mm. The first brachials are short, nearly or quite three times as broad as the outer 

 (greater) length. The proximal and distal borders are parallel from the inner side to 

 the midradial line and then the latter diverge. The distal border, except in the middle, 

 is everted and finely spinous. The inner edges of adjacent first brachials are united in 

 their proximal halves while their distal halves diverge forming a right angle. The 

 second brachials, which are slightly broader than long, approximate inwardly in a 

 manner comparable to the axillaries forming another pore with the first brachials like 

 that between the division series in each interradius. The brachials following the first 

 syzygy are at first wedge-shaped and then become triangular and longer than broad. 

 The distal edges of the brachials, though scarcely produced, are finely spinous, and 

 those of the proximal ones are somewhat thickened. 



Syzygies occur distally at intervals of about two muscular articulations. 



P! is 10 mm. long with 22 to 23 segments, of which the first is rhombic, about twice 

 as broad as long. The next four are similar but increase in length with the edge toward 



G 



4- mm 



FIGURE 46. Fariometra icwelli A. H. Clark, holotype: a. Lateral view of calyx, b, PI, 

 lacking the tip; c, cirrus. 



