176 
SMITPISONIAN INSTITUTION 
PLATE 2 
(All figures natural size unless otherwise stated) 
Gazacrinus inomatus S. A. Miller 
PAGE 
. 16 
Fig. I. 
2. 
3- 
S- 
Sa. 
6 . 
7- 
8,9. 
Post, view of calyx and rays to level of IBr. X S/2. 
Ant. view of crown with part of arms intact. X 2. 
Dorsal view of calyx, showing excavate base with IBB concealed by a columnal ; r. ant. 
side above. X S/2. 
Ventral view of cup, showing articulating faces of RR at level of IIBr, the strong inter- 
radial processes for support of orals, which are wanting here. X 2. 
The tegmen, with oral plates in position resting on the interradial processes, except the 
central part of post, oral, or a part corresponding to it. here broken away. X 2. 
Basal view of same, showing IBB at bottom of cavity. X 2. 
A detached set of oral plates lacking central part. X 3/2. 
Tegmen of another specimen with all oral plates in place, surmounted by ridges not present 
in fig. 5 ; fractured part restored in outline. X 2. 
Basal views of two other specimens. X 3/2. The ventral structures vary in different 
specimens. 
Laurel limestone; St. Paul, Indiana. 
Gazacrinus magnus new species I7 
Fig. 10. Very elongate central pyramid of tegmen, being the 5 oral plates divided by vertical 
sutures, one of which is seen at the right lower corner. X 2. 
loa. Internal view of same, showing division of the plates ; the outer lighter area corresponds 
to the lower shaded one in fig. ii. X 2. 
11. An isolated plate, one of the 5 orals from a still larger specimen, showing the sharp 
sutural faces at either side ; the lower shaded area is the surface of attachment to 
interradial processes, corresponding to the lighter area in fig. loa. X 2. 
12. Another ventral pyramid having only half as many plications as in fig. 10. 
Laurel limestone; St. Paul, Indiana. 
Gazacrinus depressus new species 17 
Fig. 13. Specimen with depressed, rounded calyx and heavy arms ; base crushed. X 3/2. 
14. Detached base, perhaps of this species, somewhat resembling the Tennessee species. 
X 3/2. 
Laurel limestone; St. Paul, Indiana. 
Gazacrinus ventricosus (Wachsmuth and Springer) 17 
Figs. 15, 15a, 15b. Posterior, basal and ventral views of tbe type specimen, the latter having the low, 
radiating pyramid in place, somewhat imperfect in the median part. X 4- 
16, 160. Distal and proximal views of detached ventral pyramid from another specimen. X 2. 
Laurel limestone; St. Paul, Indiana. 
Gazacrinus ramifer (Roemer) 18 
Fig. 17. Dorsal view of calyx with anal side above, showing the broad basal cavity lodging IBB ; 
with pentagonal projecting rim upon basals and less prominent triangles passing to the 
radial series. 
18. A nearly complete crown from 1. post, radius, with long and heavy biserial arms. 
19, 190. Anterior and posterior views of crown with part of arms, the latter having the ven- 
tral pyramid clearly in view. 
20, 200. A complete crown with the triangular sculpture on basals and radials sharply accen- 
tuated ; ant. and r. post. iR views. 
21. Part of crown of similar well marked specimen from Wa3me County, Tennessee. 
Beech River formation; all but the last from Decatur County, Tennessee. 
Gazacrinus milliganae (Miller and Gurley) 18 
Fig. 22. Basal view of type; plates raised into prominent nodes. 
23, 24. A detached ventral pyramid, and a larger specimen, perhaps of this species. 
Beech River formation ; Decatur County, Tennessee. 
