Sihiric Cystoidca and Camarocrinus. — Schuchert. 239 
specimens the number is variable. The branches going to the 
brachioles at the lateral ends of the plates have the ambu- 
lacralia as well developed as the median series. Brachioles 
slender, composed of rather large elongated pieces. Those at 
the distal ends of the ambulacra have 6 pieces in a column 4 mm. 
long, and seemingly these brachioles did not exceed 6 to 8 mm. ' 
Anal area small, not prominent, and composed of two circles 
of plates. The outer circle has from 7 to 9 pieces of unequal 
size and the flat pyramid has 7 or 8 equal triangular pieces. 
The madreporite is rather large for Pseudocrinitcs, but the 
hydropore is minute and both are placed within a distinct hol- 
low separating the ambulacra of one side. 
Basal pectinirhomb smallest and that of plates 14 and 15 
largest. 
Column slender, tapering rapidly for a short distance from 
the theca and composed of pieces of equal thickness. Length 
unknown. 
Comparisons. — -This splendid, large and odd Pseudocrinites 
is readily distinguished from all other species of this genus by 
the short, high and angulated ambulacra. The form of the 
theca and the plate sculpturing are also characteristic of this 
species. 
Formation and locality. — Of this form the National Mu- 
seum has five excellent examples, Geological Survey of Mary- 
land 1, Mr. Gordon 1, and Mr. Hartley 12. All are from the 
cystid beds of the Manlius in the quarries near Keyser, West 
Virginia. The specific name is given in recognition of the as- 
sistance rendered the writer by Mr. Geo. M. Perdew of Cum- 
berland, Maryland. 
Cat. number, 35,072, U. S. N. M. 
Camarocrinus ulrichi n. sp. 
This species is more pyriform or balloon-shaped than C. 
saffordi, and the theca is usually considerably pinched and 
prolonged basally into a high collar, evidently for the greater 
protection of the basal openings. The plates are very much as 
in C. saffordi and where stellation has not set in, adjoin with 
very finely serrated sutures, but the pores between the plates are 
much smaller and are far more abundant than in that species. 
Stellation begins in some individuals by the insertion of small 
spicular pieces between and around the pore openings and 
