302 
THE GEOLOGIST. 
True, tlie " XJi^'per and Loiver Bag shot Beds are not noticed" in my 
Table ; for tlie simx^le reason, that tliey cannot be regarded as good " Ma- 
rine Types," like tlie Barton and Bracklesham Clays : one contains only a 
few vegetable (Terrestrial) remains ; and the other rarely any fossils, ex- 
cept in one place, where, however, they are in too friable a condition to 
bear transport or examination." (See jukes's Manual, 1st ed, pp. 527 and 
531; also Phillips's Manual, p. 387.) 
In placing certain " marine and fresh-water types" on " the same line," 
the object was to show that they may be approximately " of the same age." 
When " W. W." takes on himself again 
or to "point out" the "many other mistakes" which he fancies I have 
committed, I would feel obliged by his showing the relation between the 
Lower Green Sand and the Atherfield Clay. At the friendly suggestion 
of the Editor of the ' Geologist,' I have inserted, in a new edition of the 
Table, now printing as a separate sheet, the Lower Green Sand, placing it 
at the bottom of the Cretaceous System. 
Permit me to embrace the present opportunity of making a few cor- 
rections before closing this letter. The name JRhyncopora in my Table 
(proposed for a genus or sub-genus, typified by De Verneuil's Terehratula 
G-einitziana, the peculiar characters of which were described in my " Notes 
on Permian Fossils," published in the ' Annals and Magazine of Natural 
History' for April, 1856) should have been spelled Bhyncliopora. " So- 
merset Teleosaurus Upper Lias," suggested by my friend Mr. C. Moore, 
of Bath, was by some mistake placed in the Jurassic instead of the Lias- 
sic System. 
In my paper " On the Origin of Species," contained in the last number 
of the ' Geologist,' a slight mistake has occurred. The first line of the 
sixth paragraph ought to have been — " There is no difficulty in referring 
to instances, ' etc. 
SiE, — It may be interesting to your readers to know that I have lately 
found a front tooth (incisor or small canine) of a mammalian animal from 
the Woolwich Beds, near Dulwich, exposed some time since by the works 
for the southern high-level sewer. Mr. Rickman has found some bones 
he calls mammalian, but there is a doubt as to their being such. 
" To spy into abuses, and shape faults 
That are uot," 
Belmont, near Galway, July 4, 1862. 
Tertiary Mammalian Remains at Dulwich. 
Yours, etc.. 
A. BOTT. 
5, Hanover Terrace, JPecJcJiam, Wth July, 1862. 
Sicilian Bone- Caves. 
SiE, — I hasten to give that explanation of the error or rather confusion 
in my Table which Dr. Falconer, as the original describer of the Grotta 
di Maccagnone, has a right to demand. 
