42 
Interradii :—Of liigh plates, six or seven, between the ambitus 
and the summit. A row of large tubercles runs down each side 
of each interadius. A series of small secondary tubercles occurs 
along the middle of each area, and this becomes zigzag at the 
ambitus. In the same region, and on the actinal side, there is 
also a row of secondary tubercles on the adambulacral sides of 
the plates. A few small miliaries are scattered over the area. 
Distribution :—Coralline Crag, Aldborob Type :—Reed 
Collection. 
Remarks :—This species is totally unlike any Crag Echinoid, 
and the roughness of the test (whence the name) produced by 
the large size of the tubercles, would enable scattered plates to be 
recognized. The genus has not been previously recorded, at least 
in Europe or America, from deposits older than the Pleistocene. 
Among recent species it most resembles S. eunytJirogrammus, 
with which it agrees in the arrangement of the tubercles and 
pores; but the new species differs from this in the much larger 
size of both its tubercles and apical system. 
Family FIBULARIID^. 
Grenus Echinocyamus, Yan Phelsum, 1774. 
Echmocyamus pusiUiis (0. F. Muller), 1776. 
Coralline Crag. Sutton. 
Red Crag. Allerton ; Hollesley ; Sutton; and Walton. 
Family SPATANGID^. 
Genus Spatangiis (0. F. Muller ), 1776. 
Spatangus purpureas (0. F. Muller), 1776. 
Red Crag. Sutton ; Woodbridge. 
Genus Brissus. Gray, 1825. 
Brissus unicolor (Leske), 1778. 
Coralline Crag. Iken; Orford. 
Genus Eckinocardium. Gray, 1825. 
Echinocardiuni cordutum. (Pennant), 1777. 
Coralline Crag. Boynton (Spines). 
Red Crag. Sutton (P Cor. Crag); Walton. 
J. WALTER GREGORY. 
