Vlll CONTENTS. 



Page 

 of the Bernhard Crab ; On a new American Otter, by Mr. G. 

 Barnston ; On Planorbis crista, by Lovell Reeve, F.L.S. ; On the 

 Occurrence of Lymruea stagnalis in Scotland, by Robert O. 

 Cunningham, Esq. ; Descriptions of two new Species of Pyc- 

 noffonoidea, by George Hodge; On Aquatic Hymenoptera, by 

 Mr. J. Lubbock ; On the Appearances of Cotton-fibre during 

 Solution and Disintegration, by Charles O'Neill, F.C.S. ; On a 

 singular Malformation of the Beak and Foot in the Young of the 

 Domestic Fowl, by Mr. W. Horn 45/— 467 



Index 468 



PLATES IN VOL. XL 



Plate I. Transformations of the Porcellanae. 

 II. Glyptolepis of Dura Den. 



III. Cercocalamus collaris. — Brachyurophis semifasciata. — Teleur- 



aspis nummifera. 



IV. Platyplectrum marmoratum. — Cryptotis brevis. — Hyla Krefftii. 

 V. Coal-Measure Crustacea. 



VI. Composition of the Head, &c, in Insects. 

 VII. Ascidia parallelogramma. — Molgula arenosa. 



IX (.Structure and Development of Amoeba villosa and other Rhizo- 



X.j P ods - 



XI. New British Species of Acantholeberis. 



