CONTENTS. 
No. XVIII. February,—June, 1830. 
Page 
Arr. XXVI. Explanation of the Comparative Anatomy of the 
Thorax in Winged Insects, with a Review of the present state 
of the Nomenclature of its parts. By W. S. MacLeay, 
Esq., A.M., F.LS., ge... 2 . 145 
Arr. XXVIII. Additional Notice on the Gnas Cipiomys of am 
marest. By W.S. MacLeay, Esq., A.M., F.L.S., §c. . 179 
Arr. XXVIII. On the manner in which the Geometric Spiders 
construct their Nets. By Joun Buackwaut, Esq., ELS. 
ate eR eas en Oe. BR 
Art. XXIX. Observations on a newly-described Species of Swan. 
By Joun Brackwat., Esq., F.L.S., §e. 2 6. - « 189 
Arr. XXX. ikaccedeny Notices. By the late C, Henennen, 
PD Gti 5 2 . 191 
Art. XXXI. tpiabeditio on rr Cucagiede foes in “the 
District of Upper Canada extending between York and 
Lake Simcoe, with the view of illustrating their geographical 
distribution, as well as of describing some Species hitherto 
unnoticed. By Dr. GAPPER.. . . . 201 
Art. XXXII. On Conchology, regarded as a , distinet brash of 
Science. By Henry James Brooke, Esq., F.L.S., M.G.S., 
ee emer Aa Ween ols) My be. Go tbe 
Art. XXXIII. On the Affinities of the Genus Clinidium of 
Krrey. By J.O. Westwoon, EFsq., F.LS., &ce. . . . 218 
