Prof. H. L. Hawkins—Echinords from Shenley Hill. 59 
between the Shenley specimen and that figured in Wright’s Mono- 
graph, pl. lxiv, fig. 1, but the former is slightly smaller. 
16 and 17. These small internal moulds might be referred to 
Cardiaster or Holaster with equal reason. If they are Cardiasters, 
the nearest approach would be C. benstedi Forbes, from the Lower 
Greensand ; if Holasters, H. levis (de Luc) from the Cenomanian. 
19—21. If shape is of any use in recognition of species of 
Cardiaster, the suggestions made seem the most reasonable ; they are 
given without any real confidence. 
The only specimens whose determination is sufficiently precise 
to afford safe stratigraphical evidence are Nos. 6—9 and 12—15. 
Pyrina inflata was described by d’Orbigny as occurring in the 
Cencmanian of Le Mans (Sarthe), where the general Echinoid fauna 
shows strong affinities to that of the ‘‘ Top-beds”’ of the Upper Green- 
sand. Pyrina desmoulinsi is characteristic of the “* Chloritic Marl” 
and associated deposits. P. levis is a “‘ Warminster”’ species, 
probably from the highest beds or “Cornstones”. Catopygus 
columbarius (and Caratomus rostratus) occur at the same horizon, 
and in the lowest part of the Chalk itself (sub-zone of C. columbarius). 
Nucleolites lacunosus occurs in the zone of P. asper, and ranges up 
into that of Am. carians. ‘‘ Echinospatagus”’ murchisonranus 1s 
recorded by Jukes-Browne, in the Survey Memoir, from the zone 
of Am. rostratus (Malmstone) of Blackdown and Haldon. This 
summer I found it in abundant fragments at the last-named locality, 
always in the uppermost, chalcedonic beds. These have also yielded 
a mould of Anorthopyqus orbicularis, a fossil familiar at Le Mans, so 
that they may well contain coastal deposits of ‘‘ Chloritic Marl” 
age. Cardiaster latissimus is similarly recorded from the Malmstone, 
and in Western England has been found at Golden Cap (Dorset) 
fide Wright, in sands presumably equivalent, in part, to the Black- 
down and Haldon beds. 
All definite indications seem to point to an horizon roughly 
corresponding to the ‘‘ Warminster top-beds” (of the Survey 
Memoir) for the Shenley Echinoids. It has been shown that a large 
proportion of the fossils recorded from Warminster were in reality 
collected from the ‘* Cornstones ”’ of adjoining districts, and so belong 
rather to the base of the Chalk than to the top of the Greensand. 
The outstanding feature is the relative abundance of Pyrina, about 
half of the specimens being referable to that group. This probably 
indicates local littoral conditions, since Echinonéus, the modern 
representative of the family, inhabits tidal flats. The absence of 
Biscoidea subuculus from the collection is thereby made noteworthy, 
since that species is usually far commoner than any others in the 
zone of P. asper. 
The only specimen in the collection referred to a species belonging 
to an earlier zone than thst of P. asper, is “ E.” murehisonianus. 
There can be no question as to the indigenous quality of thespecimen; 
it is quite unbroken, and of too delicate a texture to have survived 
