236 Mr. Correspondence—A. J. Tukes- Browne. 
that the caverns had been completely filled with these materials, and 
in the case of the Cae-Gwyn cave they appeared to have been con- 
veyed mainly through the entrance recently discovered under the 
drift. The stratification at this entrance was so marked, and could 
be traced so continuously inwards over the bone-earth, that there could 
be no doubt that this was the main entrance. There was not the 
slightest evidence that any portion of the material had been conveyed 
in through a swallow-hole, and the conditions witnessed throughout 
were such as to preclude any such idea. 
The author quoted a Report by Dr. Geikie, who considered that 
the wall of the cavern had given way, but before the deposition of 
the glacial deposits, which were subsequently laid down against the 
limestone bank so as to conceal this entrance to the cavern. 
In conclusion, he referred to the presence of Reindeer remains in 
these caves, in conjunction with those of the so-called older Pleisto- 
cene mammalia, proving that these had reached the area long before 
the period of submergence, and evidently at an early stage in the 
Glacial period. It was important to remember that Reindeer remains 
had been found in the oldest river-gravels in which implements had 
been discovered. Man, as proved by the implements discovered, 
was also present at the same time with the Reindeer, and it was 
therefore natural to suppose that he migrated into this area in 
company with that animal from some northern source, though this 
did not preclude the idea that he might also have reached this country 
from some eastern or southern source, perhaps even at an earlier period. 
Mr. De Rance, in an Appendix, confirmed Dr. Hicks’s observa- 
tions as to the identity of the deposits outside the cavern with those 
in its interior, and noted the occurrence of limestone blocks in the 
lower deposits, not merely at the spot where the supposed broken 
wall was situated, but also throughout the whole tunnel. He stated 
that the sand-bed forming the uppermost cave-deposit resembled the 
sand associated with gravels in a pit 400 yards east of the cave at 
a slightly higher level. The drift exposed in this gravel-pit he 
believed to be of the same age as that of the Mostyn and Bagillt 
pits to the north, which were undoubtedly overlain by Upper 
Boulder-clay. The westerly termination of the bone-earth outside 
the cave had not been determined, which he regretted; but traces 
of bone had been found at a point five feet from the overhanging 
ridge of the cave. 
CORRHSPON DENCE. 
PALHONTOLOGICAL NOMENCLATURE. 
Sir,—The questions raised by the gentleman signing himself Rob. 
W. Haddow in the Grou. Maa. for November, 1887, and discussed 
by Mr. 8. 8. Buckman in the March number, are well worthy of 
further consideration in your pages. 
I confess that I largely agree with Mr. Haddow in his protest 
against the entire suppression of the old genus Ammonites, and 
I would reply to Mr. Buckman, (1) that the genera of one family 
