(* B27") 
XXV. Anatomical Observations on the Natural Group of Tunicata, 
with the Description of three Species collected in Fox Channel 
during the late Northern Expedition. By William Sharp Mac- 
Leay, Esq., A.M. F.L.S. Communicated by the Zoological Club 
of the Linnean Society. 
Read June 15, 1824. 
Ir is almost unnecessary to state to the Linnean Society, which has 
received so many acquisitions to its Museum and so many valu- 
able communications for its Transactions, in consequence of the 
late Northern Expeditions, that almost all the gentlemen under the 
orders of Captain Parry, as well as this distinguished commander 
himself, earnestly occupied themselves during their dreary resi- 
dence in the North in collecting objects of Natural History. One 
of these gentlemen, William Nelson Griffiths, Esq., has brought 
home from Winter Island one of the best collections of inverte- 
brate marine animals that I have seen from those regions ; and 
it is with a feeling of great satisfaction that I take this oppor- 
tunity of publicly expressing my thanks to his brother, John 
Griffiths, Esq., in whose possession the collection now is, for 
most liberally allowing me not only to examine, but to dissect, 
such specimens as I might conceive to merit minute attention. 
Among these animals are three species of simple Tunicata, the 
anatomical description of which will, I hope, interest the Society, 
as this group of animals, although so low in the creation, has, in 
consequence of the late investigations of M. Cuvier, and particu- 
larly 
