Agelacrinidae and Lepadocystinae 
453 
also arranged in mosaic. This interambulacral area narrows to a 
single row of plates distally. 
Only the tip of the anterior ray, for a length of 1.5 mm., is 
preserved. 
A single large prominent plate extends from the proximal end of 
the right posterior ray toward the anal pyramid. The homology 
of this plate is unknown. 
The lateral covering plates are long and linear, and are suffi- 
ciently erect and parallel to produce the palisade effect charac- 
teristic of the genus. The longer ones slightly exceed 2 mm. in 
length, and about four lateral covering plates occupy a length of 2 
mm. At their tips they are rather abruptly truncated, presenting 
a triangular transverse outline along the crest of the rays. The 
acute angles of these plates alternate along the median line of 
the rays. 
Peripheral ring consisting of two zones. Of these the upper 
zone or inner band consists of comparatively strong plates, consid- 
erably extended in a lateral direction, but exposing only their outer 
edges. From these edges they are inclined toward the interior 
at angles of about 35 degrees with a horizontal plane. Although 
these stronger plates are arranged in diagonal lines, they maybe 
said to form about five circular rows, the upper plates being consid- 
erably larger, the largest attaining a width of 4 mm. Even in 
the second lowest row some of the plates have a width of 2.5 mm. 
In the lowest row of the larger plates the width is about 1 mm. 
These larger plates formed the less flexible support for the upper 
part of the theca. Below this was the much more flexible zone 
of small sized marginal peripheral plates, also arranged in diagonal 
rows, consisting each of about six plates. The latter vary in 
size and form from small sized plates, laterally extended, to those 
of much smaller size, vertically elongated, like the vertical scales 
of the cup of an acorn. The latter fit snugly against the bryozoan 
surface upon which they rest. 
Although only the posterior half of the specimen is preserved it 
presents the characteristic features of this half in a verysatisfactor}^ 
manner. The reversed curvature of the right posterior ray will 
distinguish this species from any other hitherto described. 
