9 



it is partially attached to the crust of chalce- 

 dony, at other times ouly a few grains of the 

 nucleus remain, in such cases the beekite 

 will float on water. The nucleus which is 

 always some organic substance, as coral, 

 sponge, or shell is occasionally silicified. It 

 is thought that after the formation of the 

 Triassic conglomerates, some of the calcareous 

 pebbles in them underwent decomposition, and 

 that water, holding chalcedony in solution, 

 deposited it on a nucleus. This it would do 

 more readily from the fact of the nucleus 

 being in a state of decomposition. It is 

 found that in whatever surface chalcedony is 

 deposited, it is in tubercles, hence the 

 tubercles on the beeldte. If decomposition 

 commenced in various points, the chalcedony 

 deposited at these points would be in central 

 tubercles, around which, as the decomposition 

 proceeded, rings would be found. Beekites 

 could only be expected m conglomerate 

 rocks, which contained decomposing calca- 

 reous pebbles, and through which water, 

 charged with chalcedony passed, a state of 

 things not frequent, hence the comparative 

 infrequeucy of beekites in any but the Torbay 

 deposit ; by Mr E. Glaisyer. a tootli, 10 feet 

 long of (Monodon Monoceros) the Narwhal, 

 or Sea Unicorn, taken in the North- Sea. 

 The number of the teeth is two, one 

 generally undeveloped, the other stretching 

 in a line with the body, and spirally twisted, 

 they are usually about six feet long ; ^Ir 

 Hennah presented, as mementoes of the day, 

 to those gentlemen who had been presen". 

 at the Annual Excursion, some exquisite 



