404 Dr. F. A. Bather on British Fossil Crinoids : 
where the indents of one margin alternate with those of the 
other. This produces a granulate effect. 
The Cirrus-facet is at the margin of the epizygal and 
facing downwards, as in B. didactylus, but does not project 
so far beyond the general outline of the columnal. In 
575438 c (Fig. 7) the outline is elliptical, with the axial canal 
and fulcral ridges dividing it into unequal halves, the larger 
being on the outside. The fulcral ridge is straight, on a 
line with the periphery of the columnal. It thickens 
slightly round the canal and towards the ends. The floor 
of the facet is curved as in B. didactylus, but toa less extent. 
The diameters are 1:°2X1:0 mm. on one facet; and 1:0x 
0-9 mm. on the other. Although the inner half of the facet 
has not the triangular shape seen in B. didactylus (Baily’s 
drawing being inexact on this), there is an inward pro- 
longation of its margins which produces an angular outline 
as seen from the syzygial face and indicates how the 
excavation might be extended. Other specimens present 
slight variations of measurement, but the plan is essentially 
the same. 
The notch on the hypozygal is not so marked as in 
B. didactylus. 
Cirrals are occasionally preserved, either attached to the 
epizygal or lying in a very shallow channel on one or more 
of the subjacent columnals. They indicate a rapidly tapering 
cirrus, of subelliptical section, with the upper (7. e., outer) 
side flattened, in the way that appeared probable in B. di- 
dactylus. The greatest length indicated is 96 mm. 
(57543 d). 
The uumber of cirri to a whorl] varies between 1, as seen 
in 57543 d, E 21926, E, 21927, E 5887 a; 2, as in 38620, 
4.9834 b, 57540 (lectotype), 57541, 57543 6, c, E 5887 a, 6, 
E 6480, E 21920, KE 21929, E 21931, E 21932, E 21934, 
E 21937, E 5888 (P. sowerbit); and 3, as in 49834 a, 
57541, 57542 a, 57543 a. Fragments containing two whorls 
are 57541 with 3 & 2 facets, 57543 6 and E5888 with 2 & 2, 
58887 a with 2&1. The arrangement in all of these is 
as in B. didactylus. The only exception is presented by 
E 21942, from Harwich, which contains 2 syzygies, one of 
which appears to bear only 1 facet, and the other 2 facets, 
separated as usual by a blank radius; but one of these 
latter lies on the same radius as the single facet on the 
other whorl]. The specimen, which lies on matrix, has, how- 
ever, been broken across in several places, and the fragments 
may well have been replaced with the wrong orientation. 
