50 
DONATIONS. 
A Description of the Shetland Islands, comprising an 
Account of their Geology, Scenery, Antiquities, and Supersti- 
tions. By Samuel Hibbert, M.D., F.R.S.E., &c. Pre- 
sented by the Author. 
Memoir on the Tings of Orkney and Shetland. By the 
same Author. 
Observations on the Theories which have beeen proposed 
to explain the Vitrified Forts of Scotland. By the same 
Author. 
Flora Batava, No. 108. By H.C. Van Hall. Presented 
by the Author. 
The American Almanac and Repository of Useful Know- 
ledge, for the Year 1837. Presented by the American Phi- 
losophical Society. 
January 23. 
RICHARD GRIFFITH, Esq. in the Chair. 
Captain Portlock read a notice of the occurrence of 
Anatifa Vitrea,* of Lamarck, in several localities on the 
Trish coast. He commenced by enforcing the great impor- 
tance of recording as quickly as possible the first discovery in 
a new locality of any species of the animal or vegetable king- 
dom, as tending to perfect the Fauna or Flora of the district 
in which it is found; and pointed out the value of such local 
Faunz and Flor in estimating the relations and mutual de- 
pendencies of co-existing animals and plants, and affording 
a basis of comparison by which future observers may be 
enabled to test the probability of new organic beings occa- 
* Lepas fascicularis, of Ellis, Montague, and other authors ; Lepas dilata, of 
Donovan. 
