BATOCRINID.2. O17 
them angular above, the other two truncated, one of the latter support- 
ing the first anal, the other the anterior radial. Radials generally wider 
than the two costals. Distichals two when palmars are represented, but 
five or more if these are wanting. In the latter case a stout pinnule 
from the second distichal takes the place of an arm, and the plate above 
is not pinnule-bearing. Arms long and slender, composed of cuneate single 
pieces. Pinnules stout, given off alternately from opposite sides. Inter- 
brachials, interdistichals, and interpalmars numerous; the anal side wider, 
with a longitudinal row of anal plates, followed by a strong ridge. ' Ventral 
disk composed of minute irregular pieces. Position of anus unknown. Col- 
umn quadrangular; axial canal small, pentangular; the angles interradially 
disposed. 
Distribution. — Upper part of the Hudson River group of Ohio. 
Remarks. — Compsocrinus Harrisi, the type of the genus, was originally 
described by Miller under Glyptocrinus, and nothing was said of the first 
anal forming a part of the radial ring. Neither was this noticed in 1883 
in Miller’s generic description of Compsocrinus, but his diagram shows it, and 
he also stated it in the revised specific description. The structure was over- 
looked by us in 1881 when we referred the species to Mariacrinus. Since 
then we have discovered that Miller’s “ Glyptocrinus”’ miamiensis also belongs 
to this genus, having a quadrangular stem, and four basals supporting six 
plates. | 
Compsocrinus Harrisi S. A. Mitzer. 
Plate XXI. Figs. Sa, b. 
1881. Glyptocrinus Harrist — 8. A. Mitten; Journ. Cincin. Soc. Nat. Hist. Vol. TV. (April number), Plate 
1, Figs. 4, 4a. 
1883. Compsocrinus Harrisi —8. A. MituEeR; ibid., Vol. VI., p. 234, Plate 11, Figs. 4, 4a. 
1885. Mariacrinus Harrisi — W. and Sp.; Revision Paleocr., Part IIL. p. 104. 
A small highly ornamented species, Calyx higher than wide; rapidly 
expanding to the middle of the first costals, less spreading above ; interradial 
areas depressed. Surface covered with prominent ridges, arranged into well 
defined stars with intervening triangular depressions. Radial ridges wide 
and prominent, occupying one half the width of the plates, rounded on the 
back, and wider at the ends of the plates than at the middle. The ridges 
toward the interbrachials lower and flattened at the top, but like the radial 
ridges stoutest near the suture lines, a peculiarity which is also found at the 
interdistichals and interpalmars. | 
