iv 
CONTENTS. 
IX, — Observations on the Anatomy of the Pemmeles na- 
suta, from New Holland, By Robert Edmond 
Grant, M. D., Professor of Zoology and Comparative 
Anatomy in the University of London, &c. - - 184 
IX*. — Meteorological Journal from the Month of the Rio 
de la Plata to the Coast of Chili, 1822; with a Chart. 
By William Jameson, Esq. Surgeon, - - - 203 
X — Memoir on the Geology of the Snowdon Range of 
Mountains, as connected with its Scenery, Soil, and 
Productions. By James Stuart Menteath, Esq. 209 
XL— A Commentary on the Second Book of the Herba- 
rium Amboinense. By Francis Hamilton, M. D. 268 
XII. — On the Anatomical Peculiarities of the Sturgeon 
(^Acipenser Sturio, L.) By David Craigie, M. D., 
Extraordinary Member, and formerly President, of the 
Royal Medical Society, Edinburgh, „ - - 334 
XIII. — Observations on the Aranea geometrica, ohtextrix, do- 
mestica, and other Spiders ; and particularly on the 
power they possess of fixing their thi-eads horizontally, 
or at any degree of inclination, to two perpendicular 
bodies at a considerable distance from each other, so 
as to suspend the circular part of their web in an open 
space : Also some remarks on the Food of Spiders, &c. 
By Mark Watt, Esq. M. W. S. - - - 365 
XIV. — Description of a Siiurus, known in Demerara by the 
name of Gilhache, more properly Geelbuik, By Dr T. 
S. Traill of Liverpool. - - - - 377 
XV. — Description of a New Species of Cephalus, which it 
is proposed to name Cephalus Coclierani^ Cochrane s 
Simfish. By Dr T. S. Traill of Liverpool. - 381 
XVL — Remarks on the Genus Scissurella of M. D'Orbigny, 
with a Description of a recent British Species. By 
John Fleming, D. D., F. R. S. E. &c. - - 384- 
XVIL — Account of an Optical Illusion called the Fairy 
Islands, seen on the North Coast of Ireland. In a Let- 
ter from Mr Samuel Thomas Gregg to Mr Stewart, 388 
