106 ANALYTICAL INDEX. 



CHAPTER II. continued. 



FLATTENED SPIRAL TESTACEA, . . PAGE 47 



Singular arrangement of nature, . . . ib. 



Everything harmonious in nature, ... ib. 



The Ammonites, .... ib. 



PLANORBIS INCONSPICUA, .... ib. 



Minute figure and animal described, . . ib. 



Colour, &c., ..... ib. 



PLANORBIB SPIRORBIS, . . . .48 



Shell and animal described, ... ib. 

 Pulsation, ...... ib. 



Food, ..... ib. 



Motions, &c., . . . . ib. 



Instances of its tenacity of life, 49 



Spawn in March, . . .50 



Experiments in 1820, .... ib. 



PLANORBIS RHOMBEUS, . ib. 



Shell and animal described, . . . . 51 



Food, the Equisetum, $c., . . ib. 



Specimens from Coldingham Loch, . . ib. 



PLANORBIS CARINATUS, . . . .52 



Shell and animal described, . . ib. 



Unexplainable peculiarities, ... ib. 



Feeds on the common pond weed, &c., . ib. 



PLANORBIS IMBRICATUS, 



Diameter of the shell, &c., . ib. 



Animal a Limax, . ib. 



Feeds on vegetable substances, . . ib. 



Spawns in February and May, . ib. 

 Plate XI. described, 51, 52, 53 



VALTATA OBTUSA, . >b- 



Resembles the Helixes of the field, &c., ib. 



Shell and animal described, . ib. 



Colour bluish grey, . . 5* 



Feeds on the Equisetum, . . ib. 



Vivacious dwells in lakes and tranquil streams, . ib. 



Either different species or great varities of this animal, ib. 



Spawns in August, . . . ib. 



Progress of spawning described, . . 55 



