TRANSACTIONS OP THE SECTIONS. 
73 
ination and the Scotland district. The earthy marl and gray clay of which the 
iMiit of Mount Hillaby consists, contains no less than fifty-five species of Poly- 
fl^tina, tiro species of Polygastrica, four species of Geolithia, and seven species of 
. . . . x»f IV 
iivoQld be of great interest to have rocks from otlier localities m the West Ind^a 
hiipeiag'i examined niicroscopicnlly, in order to discover whether they contain 
Mjintiiu, which might lead to conclusions of importance to the relative ages at 
ik^ap of isLinds. In looking over a collection of rocks from .lamaic* at tlie 
idopoi Society, the author noted a strong Minilatity in ihcir mincnilogical cha- 
This referred chiefly to some rocks iirc.scnted to that Society by the Kcv. 
IkJtIlyfrmn Clarendon, which seemed almost identical with some of those from 
ktWu». Among those from Jamaica were likewise bituminous coal and bitunti- 
49 wood. 
VjiTQct of a Leiier from Mr. E. VivtAN of Torquay, respecting 
the Phainomena of Kent's Cavern. 
Ihf Impoitant point which we have established t«, that relics of human art are found 
the uabroken floor of stalagmite. .After taking every precaution, by sweeping 
'* «rf»ce, and examining most minutely whether there were any traces of the floor 
previously disturbed, we broke through the solid stalagmite in three. 
tHnnipsrts of the cavern, and in each instance found flint knives, closely resero- 
the rudest of those found in the moat ancient barrows. The nearest spot at 
•thflini is found is Aller, about five miles distant. The thickness of the stalag* 
4 shout two feet, in the spot where the most highly-finished specimen was 
W the pjusage was so low, that it was extremely diCBcult, with quarry-men’s tools 
* ^ood workmen, to break through the crust t and the supposition that it had been 
?rviously disturbed is impossible in an age when no metal appears to have been in 
*1 The spot was about 400 feet from the entrance. If the Secretary of the Geo- 
Society has sent you the plans which were exhibited before the Society when 
•jpaperwas read, it will be seen marked upon the ground plan. 
ZOOLOGY. 
On (he Animal o/’Lepton Stiuamosum. Josijua Alder. 
” “f this hitherto undescribed mollusk is very large, extending much 
■iriMi Tu ‘® fringed with filaments, one of which is much longer than 
The mantle is onen. excent for a short snace before and behind, and 
““Wing, and has a disc like the foot oiNucula. It forms a fine byssus. 
‘fwchial leaflets are two or. each side. 
on British 3follnsca, icith tlest'riptions of new Species, 
