28 
AUG. F. FOERSTE 
is part of a starfish, but if the nodose projections were removed 
the plates would at least be similar in size and irregularity. The 
larger of these plates are 2 mm. in width and the central nodose 
projections are slightly over 1 mm. in width. Smaller plates 
have correspondingly narrower projections. All plates are of 
about the same thickness, about 0.8 mm., and the nodose eleva- 
tions vary from a little over 1 mm. on the larger plates to about 
0.6 mm. on the smaller ones. The width of the nodose elevations 
is slightly greater at the top than at mid-length, and they may 
have served as supports for spines. 
Stereoaster squamosus sp. nov. 
Plate VII, figs. 2 A, B, C 
In its present state, the echinoderm here figured and described 
resembles a starfish, and as such it is here described, although 
structurally differing from all of the three major subdivisions 
of the Palaeozoic Stelleroidea so far proposed — the Asteroidea, 
Auluroidea, and Ophiuroidea. 
Rays five, slender and gradually tapering, separated by dis- 
tinct interbrachial arcs. The radius of the disk, from the center 
of the disk to the interbrachial arcs, varies from 4.5 to 5 ihm. 
None of the rays is preserved as far as its tip, but from such parts 
as are preserved it is estimated that the radius from the center 
of the disk to the tip of the rays equals about 18 or 19 mm. In 
two of the interbrachial arcs the outline of the disk is moderately 
convex rather than concave. 
Only the actinal side of the specimen is exposed, but this side 
of the specimen appears considerably worn so that almost all 
of the plates actually exposed undoubtedly belong to the 
abactinal part of the integumentary skeleton, only the inner sur- 
faces of the abactinal plates being visible in most cases. 
In the interbrachial area between rays I and V, as designated 
on the accompanying figures, there is a broad, flat, scale-like 
plate. Between this plate and the center of the disk, the bevelled- 
off inner margins of at least four additional similar plates are 
exposed. These plates overlap each other in such a manner 
