CONTENTS. 
I. Description of the Organ of Voice in a new Species of Wild Swan (Cyg- 
nus Buccinator, Richardson). By WiuttaM YannELL, Esq., F.L.S. & 
AE» Sage E s . 5 paged 
H: Doa of "e British is of ieu rds: Fi shes belonging to 
the Genus Leuciscus of Klein. By WILLIAM YARRELL, Esq., F.L.S. & 
nee ois <= $ 
III. Observations on the opea WWE f Linad By Mr. 
Davin Don, Libr. L.S. ee 0 A 
IV. On the Adaptation of the Sirus of the "Sloths to heit Peka Mode of 
Life. By the Rev. Wiiu1am Buckiann, D.D., F.R.S. F.L.S. F.G.S., 
and Professor of Geology and Mineralogy in the University of Oxford. 17 
V. Observations on Naticina and Dentalium, two Genera of Molluscous Animals. 
By the late Rev. Lanspown GuirpiNG, B.A., PLS. . . . . 29 
VI. Monograph of the East Indian Solanee. By Curistian GODFREY Nils 
von Esenseck, M.D., F.M.L.S., President of the Imperial Academy 
Nature Curiosorum, and Professor of Botany in the University of Bres- 
ee a UU ra v.v. a 
VII. On the Lycium of Dioscorides. By Joun Forges Rove, Esq., F.L.S., 
late Superintendant of the Hon. East India Company's Botanic Garden 
at Saharunpore . . < oo 
VIII. A Review of the Namdal Order Minen. By M. AiPibiés De 
CanpoLLE, Honorary Professor and one vm the Directors of the Bo- 
tanic Garden at Geneva . . -T 
IX. On the Modifications of Æstivation PER in certain Plants, Jormerly 
referred to the Genus Cinchona. By Mr. Davo Dos, Libr. L.S. 139 
X. Additional Observations on the Tropeolum pentaphyllum of Lamarck. By 
EE avy ON, IU LS ... .. .. . 074 * «145 
