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XXV. Anatomical Observations on the Natural Group o/"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. 



It 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 Tunicafa, 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 



