PETALOCRINUS MIRABILIS 173 
STRICKLANDINIA CASTELLANA White. 
1876. Stricklandinia castellana (NV. S.) White. Proc. Acad. Nat. Sci. Phil. 
Pp. 30. 
1894. Stricklandinia castellana Hall & Clarke, Rep. N. Y. State Geol. for 
1893, Vol. Il., Pl. 49, Figs. 1-3, 5. (Handbook of Brachiopoda, Part II.) 
As this species is found in association with the preceding it 
is thought advisable to make note of it here, and as the original 
description is somewhat inaccessible it is copied in full: 
Shell moderately large, sublenticular, broadly subovate or subcircular in 
marginal outline; valves almost equally convex. 
Dorsal valve usually showing a slightly elevated, indistinctly defined 
mesial fold, which is quite narrow upon the posterior portion of the valve, 
but widens towards the front, of adult shells; umbo broadly convex; beak not 
prominent. 
Ventral valve usually having a slight flattening of the antero-median por- 
tion, corresponding with the indistinct fold of the other valve; umbo broadly 
convex ; beak not prominent, projecting backward little if any beyond the 
beak of the other valve; area distinct, narrow, its length less than half the 
greatest width of the shell. 
Surface of both valves marked by numerous, rather coarse, radiating, 
more or less recurving, angular or sharply rounded plications of unequal size 
and separated by spaces of unequal width. 
Length and breadth of the largest example discovered, each forty-two 
millimeters; thickness, both valves together, twenty-one millimeters. 
EXPLANATION OF PLATES.* 
Plate VI. 
Fig. 1. Petalocrinus (?) major. 
Figs. 2-5. Petalocrinus mirabilis. 
Figs. 2, 3. Two specimens showing all the arms in position. 
Fig. 4. Animpression in the chert of the ventral surface of a detached arm. 
Fig. 5. Ventral surface of a detached arm, 
Figs. 6-8. Goniophyllum pyramidatle. 
Plate VII. 
Figs. 1-4. Pentamerus oblongus var. corrugatus. 
STUART WELLER. 
A. D. Davipson. 
LABORATORY OF PALAONTOLOGIC GEOLOGY, 
UNIVERSITY OF CHICAGO. 
‘All the figures are natural size. 
