202 
SMITHSONIAN INSTITUTION 
PLATE IS 
(Figures natural size unless otherwise stated) 
Marsipocrinus inflatus (Troost) 
Figs. I, la, ih. Lateral, dorsal and ventral views of characteristic calyx, with rather smooth teg- 
men, high conical and laterally constricted; dorsal surface elaborately sculptured; 
basal pentagon very large, slightly concave, and notched at the interbasal sutures; iBr 
not projecting, but bent over into the tegmen. 
2, 2a, 2b. Similar views of specimen with tegmen plates tubercular and better defined. 
3- Specimen with typical contour; tegmen profusely covered with small tubercles. 
4, Ad, 5, 5a, Sb, 6, 6a. A series of dorsal cups, showing large size of basal pentagon. 
7, ya. A similar specimen, original of Wachsm.uth and Springer, N. A. Crin. Cam., pi. 75, 
fig. 17. 
8. Detail of tegmen of broken specimen, enlarged, showing course of ambulacra leading to 
the interbrachial pinnules. Reproduced from paper on Scyphocrinus, 1917, pi. 9, fig. 6, 
as M. striatus? X 2. 
From limestone beds top of Beech River formation; Decatur County, Tennessee. 
Marsipocrinus rosaeformis (Troost) 
Fig. 9. Ventral side of an imbedded specimen, with bases of arms perfectly preserved, and pin- 
nules springing both from the arms and interbrachial margins as continuations of 
tegminal ambulacra. Posterior is at upper right. 
9a. Detail from posterior margin of same, enlarged X 3, showing course of ambulacra lead- 
ing to interbrachial pinnules. From Scyphocrinus, igij, pi. 9, figs. 5a, b; Dolatocrinus, 
1921, pi. 2, figs. 5, 6, as M. tennesseensis. 
Beech River formation; Decatur County, Tennessee. 
PACE 
. S8 
57, 59 
