161 



Table of the Weights of Land and Fresh Water 

 Shells found in this Neighbourhood, in Grains 

 AND Tenths of Grains. 



(The Number in the Second Column, when only One, implies 

 that on the average each Specimen weighs what is given in the 

 Third Column, and when the Number in the Second Column is 

 Three or upwards, it implies that it requires the Number of 

 Specimens given to weigh One Grain.) 



Name of Shell. 



Name of Shell. 



tost 



Auodonta cyguea 



— cygnea var. 



Ponderosa 



Unio pictorum 



— tumidus 



Ureissena polymorpha 

 Cyclas rivicola 



— cornea 



— caliculata 



Pisidium amnicum .. 



— nitidum .... 



— Henslowiana 



— cinereura ., 



— obtusale 



— pulchellum . 



— pusillum.. .. 

 Paludina vivipora . .. . 

 Bithinia tentaculata . . 



— Leachii .... 

 Valvata piscinalis. . . . 

 Neritina fluviutilis .. 

 Succinea putris 



— Pfeifferi .... 

 Physa hypnorum .... 



— fontinalis (large 



variety) 



— — (small 

 variety) 



Ancylus fluviatilis.... 



oblongus 



LimnoEus gjutiuosus. . 



— stagualis(Nots) 



— — (Buclts) 



— palustris 



^— auricularius .. 



— acutus 



— pereger 



— glaber (Cornwl) 



— — (Bulwell) 



— truncatulus.. 

 (Scarbro').. 



— — (Notts) 

 Planorbis corneus. . . . 



— marginatus. 



IS70 



1590 



316 

 79-2 

 21-0 

 I -.5 

 0-4 

 1-3 

 10 

 0-2 

 0-2 

 0-2 

 0-1 

 1-0 

 630 

 1-5 

 10 

 0'4 

 2-0 

 17 

 0-3 

 0-4 



1-0 



10 

 10 

 1-0 

 l-O 

 11-0 

 22-0 

 3-5 



7-o! 



30 

 3-0 

 0-.5 



04 



0-5 

 0-4 

 11-5 

 30 



Planorbis albus . . . , 



— carinatus., 



— spirorbis . . 



— vortex .... 



— contortus., 



— nitidus . . , . 

 Helix nemoralis 



— hortensis 



— nemoralis (ayel- 

 low variety).. 



— aspersa 



— arbustorum .... 



— ericetorum .. . 



— caperata (Notts) 



— — (Cornwall) 



— — var. (Nor- 

 wich) 



— hispida .. 



— rotundata. . 



— reveiata . . . 



— sericea ..... 



— pulchella... 



— aculeata . . , 

 Zonites cellarius . 



crystallinus . . 



aliiarius 



radiatulus . . 



purus 



nitidus 



excavatus. . . . 



nitidulus .... 

 Clausilia nigricans. . . . 

 Vitrina pellucida .... 

 Bulimus obscurus ., 



Achatinafcicula 



Carichium minimum.. 

 Pupa umbilicata 



— pygmcea 



Zua lubrica 



Azeca tridens 



Balea fragiiis (Corn- 

 wall).. 



— — (Yorkshire) 



— — ^Notts.) .. 



1-0 

 I'O 

 0-2 

 3 

 0-1 

 1-0 

 220 

 8-0 



