468 
Aug, F. Foerste 
at least six plates take part in this cone. The outer circle consists 
of larger plates where in contact with plates 7 and 8, of medium 
sized plates where in contact with plate 14, and of small plates 
where in contact with plate 13. The details are more or less 
obscured. 
A third specimen in the Faber Collection, 9961C, is badly 
weathered, but for that very reason presents an excellent view of 
the outlines of plate 19, all of the ambulacral plates having 
dropped off. The suture between 13 and 14 also is well exposed, 
and there is no doubt as to the exclusion of plate 19 from contact 
with the anal area. Plate 19 is never in contact with plate 18. 
Some of the deltoids are very distinctly outlined along parts of 
their margins. A brachiole attached to one of the proximal facets 
of the ambulacrum crossing plate 16 has a length of more than 
3 mm. The. most interesting part, however, is the anal area, 
which again presents an outer and inner circle of plates. The inner 
circle forms the conical pyramid, and apparently consists of nine 
plates, although the number may have been only seven. The outer 
circle has the largest anal plates along plates 7 and 8, with medium 
sized plates along plate 14 and the immediately adjacent part of 
plate 13. The remaining anal plates, along plate 13, form a very 
narrow row of very small plates. Perhaps the total number of 
anal plates in contact with plate 13 is as great as fifteen or sixteen. 
From this the very small size of th smallest plates may be inferred. 
The circular area of attachment of the column has an interior 
diameter of 2.3 mm., and an exterior diameter of 3.2 mm. 
43. Brockocystis, Gen. nov. 
This genus is very closely related to Lepadocystis, but differs in 
the following particulars: 
There is no pectinirhomb on plates 11-17. Plate 19 is in direct 
contact with plate 18, at least along the upper lateral margins of 
the two plates. Plate 13 has not been raised sufficiently to 
separate plates 18 and 19, but comes in contact only with their 
lower lateral outlines. Anal area large. The ambulacral or sub- 
vective system is much more restricted, the ambulacra extending 
only short distances over plates 16 and 17, and not reaching the 
base of plates 18 and 19. The number of brachiole facets is very 
small, and although the brachioles are missing it may be assumed 
