VoL. XVI.(2) | INFERIOR-OOLITE ECHINOIDS 153 
horizon is the one at which it occurs most abundantly. 
Second, Hyboclypeus caudatus is definitely a Lower 
Trigonia-Grit form, and occurs in but one other deposit, 
namely, the Upper Freestone, and then is only of rare 
occurrence. The horizon Lower Trigonia- Grit was 
queried in the list. 
Thus, although a certain amount of knowledge is pos- 
sessed concerning the horizons at which the echinoids 
occur in the Inferior Oolite of the Cotteswold Hills, it is 
hoped that the details contained in this paper concerning 
their stratigraphical distribution over the more extended 
region of the West of England, will be of service to the 
palzeontologist—to whom the knowledge is essential— 
who may not have had the same opportunities that we 
have had for collecting in the field. 
There was necessarily a considerable amount of palzon- 
tological research work to be done in connection with the 
;dentification of the specimens collected, and this has 
been accomplished by one of us (E.T.P.) alone. In the 
progress of this work several hitherto unnamed species 
and varieties were encountered, which it was thought 
desirable to name ; but it must be understood that the 
paper does not claim to be a revision of the Inferior- 
Oolite echinoids of the West of England. 
We have received assistance from several sources : the 
loan of echinoids from Miss H. M. Hutton, of Hares- 
combe; Mr Charles Upton, of Stroud; Mr J. W. D. 
Marshall and Mr J. W. Tutcher, both of Bristol. To 
Mr Tutcher we are also indebted for the photographs 
reproduced in Plates XVI. and XVII.; while to Dr F. A. 
Bather, F.G.S., we have to acknowledge some useful 
criticisms and notes. Mr S. S. Buckman, F.G.S., very 
kindly assisted in suggesting the horizons from which 
the Dorset specimens were derived. 
