40 
Remarks :—By its size and general proportions this species 
resembles E. miliark, O.F M., from wliicli it differs in the 
tuhercnlation. In E. miliaris a row of large tubercles runs 
down each side of the interradii and each ambital plate has in 
addition four or five secondary tubercles and a crowd of 
granules. In the new species corresponding plates have two 
tubercles nearly equal in size^ witli occasionly one or two 
small secondary tubercles and a very few granules. The 
tuhercnlation of the Crag specimens of E. miliark agrees fully 
with that of recent forms : the vertical row of secondary 
tubercles does not become pronounced till the sixth plate from 
the summit instead of on the third, as in this new species. 
Echinus icoodi. Desor, 1856. PI. I., fig. 8. 
There is a fragment apparently belonging to this species in 
the collection from the Coralline Crag of Orford. The only 
other specimen of this species was identified by Professor 
Forbes in his monograph as belonging to the cbaracteristically 
Mediterranean Echinus melo. 
Echinus hensloici. Forbes, 1852. PI. I., fig. 2, 3 & 4. 
Red Crag. Walton. 
In this paper, an Echinus, from the Red Crag at Walton, 
which was named E. ruber by Mr. Keeping, is referred to 
E. hensloivi. This course has only been done after considerable 
hesitation. The tuberculation differs from that shewn bv 
Forbes, in his enlarged diagram showing the arrangement in a 
plate of E. hensloici ; but a careful examination of the type 
shows that this figure is not quite accurate in details, and that 
the distribution of the granules is practically identical in the 
two specimens. The main difference between the two specimens 
is in their general form: E. hensloici is conical, and the Reed 
Collection specimen yery depressed; the area round the apical 
system has been destrot^ed in the latter, but the British Museum 
has recently received a specimen which explains the depression. 
In this specimen there is a series of five hollows in the summits 
of the five interradii, and these are connected hy a depressed 
ring which surrounds the apical area. The cause of these 
depressions is at present quite uncertain; exactly the same 
arrangement is found in the depressed forms of Temnechinus 
