396 Dr. F. A. Bather on British Fossil Crinoids : 
is perhaps predominant ; it is seen, for instance, in E 21977- 
21982, E 21984, E 22027. But the number 3 is also 
common, and occurs in E 21983, EK 21985-21993, E 21975. 
Occasionally only one facet is found, as in E 21977 epizygal, 
E 22027 hypozygal. Not a single specimen has more than 
3 facets to the node. Meneghini (op. cit., pp. 40, 41) refers 
to this species specimens from the Eocene of Albettone in 
the Euganean Hills, one with 4, another with 5 facets; but 
his reference is unconfirmed. 
Only about half of those specimens in which one of the 
syzygial faces is preserved have the intersyzygium complete. 
But those that have are enough to show that the cirri are 
distributed according to a definite plan. When there are 
three facets at one end, they are not adjacent, but one is 
opposed to the two others, being separated from them on 
each side by a blank radius. At the other end of the inter- 
syzygium there will never be 3 facets, but only 2; and these 
will occupy the radii left blank at the other end. The 
arrangement may be symbolized thus :— 
A b C D e 
a B Cc d E 
The next case is when there are 2 facets at each end. 
The arrangement then is 
a B c D e 
a b C d E 
or A b C d e 
In only one specimen, E 21984, does a facet appear to be 
repeated on the same radius, thus : 
a B c D e 
A b c D e 
but the specimen has been shifted in the middle and pro- 
bably twisted also. 
In the rare cases where only one cirrus was borne by 
the nodal (e. g., HE 21977), it seems to have alternated in 
position with two at the other end, 
a B c D e 
a b C d e 
In E 22027, however, the single notch on the hypozygal is 
on the same radius as one of the two facets on the epizygal. 
