Zoological Club of the Linnean Society. 131 



hrana tympaniformis, and from the power of altering the length of the 

 bronchicE. 



The muscles of the inferior larynx vary in number from one pair to 

 five. They are least complex in the Falconidce, some of the Insessores, 

 and nearly the virhole of the Rasores, Grallatores, and JVatatores. In 

 the Psittacidce they are more complex, consisting of three pairs, a num- 

 ber which is not met with in any other family of birds. They attain the 

 extreme number of five in the Corvi, starlings, larks, thrushes, finches, 

 warblers, swallows, &c. 



ZOOLOGICAL CLUB OF THE LINNEAN SOCIETY, 



May 12, 1829. — A paper On the Organs of Voice in Birds: by W. 

 Yarrell, Esq., F.L.S., was read by the authour, who subsequently illus- 

 trated the subject by references to numerous drawings which he exhibited 

 to the meeting. A discussion ensued in which the Chairman, Mr. 

 Brookes, and Mr. Yarrell took part. 



May 26. — Mr. Yarrell exhibited, for the Rev. L. Jenyns, F.L.S., a 

 specimen of Plecotus barhastellns, recently taken in Cambridgeshire, and 

 stated that this was the second instance recorded of its occurrence in 

 England. 



June 9. — The Rev. W. Kirby exhibited drawings of numerous Insects 

 intended for publication in the forthcoming Fauna of North America. 

 Among them were types of several new genera of Coleoptera, and also a 

 new species of Procerus, a genus hitherto confined to the old Continent, 



A paper On Luminous Insects .- by R. Chambers, Esq., F.L.S., was 

 read by the authour. 



June 23. — Mr. Yarrell exhibited numerous drawings and preparations 

 of the trachecE of Birds, for the purpose of illustrating his paper " On 

 the Organs of Voice," which was read at the meeting of May 12. He 

 explained them to the members present at some length, pointing out the 

 most simple form, and proceeding to the more complex. 



Xovemher 24. — Mr. Leadbeater exhibited specimens of several spe- 

 cies of Psiitacidcp, which he believed to be new to science. Among 



i2 



