32 
The coast sections exhibit the same division, but not so 
clearly marked as it is in the fine vertical exposure of 
Uintacrinus in the quarry. Marsupites testudinarius was for- 
merly described in text books under several specific names, 
derived from the smoothness or roughness of the ornamenta- 
tion on the calyx plates. The smooth plates are generally 
found in the small specimens, and may be younger than the 
rougher ones. Marsupites has been described by a great living 
authority* as like to ‘‘ Mahomet’s coffin suspended between 
heaven and the earth, for it has no ancestors or successors.”’ 
This zone is very well represented on the low cliffs and inter- 
tidal chalk near Roedean Cottage, and poorly, mainly in single 
plates, in Kemp Town Railway Quarry, as we there reach the 
base of the zone only. It has not yet been found in any other 
exposure in this district. I think it may yet be discovered in 
the railway cuttings between Brighton and the Dyke. This 
rare and beautiful fossil is formed of sixteen unjointed body 
plates, with five rows of unjointed arm ossicles. It was a free 
swimmer, and no perfect specimen has yet been found, a rare 
joy awaiting some future searcher. I have seen a few fair 
specimens in flint, and should not be surprised if it is found 
in that position. There is no better exposure for fine large 
examples than the low cliffs and inter-tidal chalk from Roedean 
Cottage, and four hundred yards eastward there I have found 
many beautiful specimens, but without the arm plates. I give 
the dimensions of two kindly made for me by Dr. F. A. Bather. 
They may be useful for the guidance of future collectors :— 
Noss No. 2. 
Mm. Mm. 
Height ... 2 :.. 45°22 | Height... = ... 458 
Greatest width... ... 46°5 | Greatest width ... 406 
Least width ... > 84:4 | Leastwidth ... =. ple 
Average width .. ... 40:4] Average width «2 O90 
So far as is known at present, Marsupites is better repre- 
sented in England than in any other part of the Cretaceous 
sea, and it is only found in a small vertical horizon in that 
sea. It has now a very small geographical range, being 
found only in fragments in France and in Algeria, and not 
in America, which is very surprising when we consider the 
large development in that country of the lower part of the 
zone Uintacrinus. There is little doubt it will yet be found 
in the United States, India, and Palestine. 
Among the characteristic fossils of the zone are found 
Echinocorys vulgaris, of a helmet shape, hence the popular name 
of Shepherd’s helmet. The zone can be fairly well recognised 

Dr: ” Bather. 
