34 
Rowe’s collection,—undescribed for twenty years. They were 
also found in the Willett collection in the Brighton Museum, 
described as Marsupites. In 1899, directed to search in the 
neighbourhood of the Black Rock, by Dr. Rowe and Mr 
Sherborn, I was successful in finding a few plates and 
ossicles on the inter-tidal chalk, the only exposure on the 
coast. They are not found beyond five hundred yards to the 
east of the steps at the Coombe Rock, where Marsupites begin 
to be sparingly found. Making an examination of the inland 
exposures this winter, I found an exposure of the zone of 
fifty feet in the Kemp Town Railway Station Quarry. It con- 
tains single plates and many ossicles, accompanied by many 
fragments of Bourgeticrinus. This is the only other exposure 
of Uintacrinus in the Brighton district and also the best. It 
can be traced from the base of the west side of the quarry, 
gradually rising until it joins the Marsupites beds at the 
top of the tunnel, a height of 85 feet. The base of the 
tunnel is the zone of Micraster cor-anguinum. This quarry is 
the only exposure of Marsupites, Uintacrinus and Micraster cor- 
anguinum that can be studied in situ in the inland exposures, 
as only a few connected plates of Uintacrinus have been found in 
Britain. I give some measurements and description from 
Professor Beecher* of perfect specimens found on a slab in 
Kansas. ‘‘ Notwithstanding the considerable geographic range, 
the horizon appears to be nearly constant. The slab occupies 
27 square feet of surface. In the area are calyces of 220 
individuals. Occasionally a specimen measures 70™™ across 
the diameter. A flattened condition is about 60™™ 
minimum specimen. The arm branches can seldom be traced 
more than 10mm _ from the calyx, though separate ones 
extend quite five times that distance from the surface. The 
presence of several small Ostrea larva tends to show that the 
water was of a moderate depth. Nearly all the specimens of 
Uintacrinus, as well as the limestone layers containing them, 
are of a light buff colour.” 
I have found Ostrea larva in the Uintacrinus beds at the 
Black Rock. It is now in the British Museum. This is the 
lowest zone that it has been yet found in England. This co- 
relation of Uintacrinus and Ostrea larva from Western Kansas 
in America to Brighton, a distance of six thousand miles, gives 
an enormous area to the nearly contemporaneous deposits in the 
cretaceous sea. The absence of Marsupites in America may 
possibly have been caused by the land rising in America and 
sinking in England. With Uintacrinus is associated, at the 
Black Rock and Kemp Town quarry, two fossils of an equally 
restricted vertical range. Actinocamaw verus, which is not 

* American Journal of Science (1900). 
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