ROEBUCK MEMORIAL NUMBER. 



187 



ENGLAND. 









Thames. 













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15 



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Name of Species. 



Records in italics require 

 confirmation. 



15 16 17 IS 19 20 21 22 23 24 



17 ... 19 ... 21 22 23 24 



15 16 17 18 19 20 21 22 23 24 



15 16 17 18 19 20 21 22 23 24 



15 16 17 18 19 20 21 22 23 24 



... 16 ... 18 



15 16 17 ... 19 20 21 22 23 24 



15 20 ... 22 23 24 



15 11; 17 18 19 20 21 22 23 24 



17 18 ... 20 21 22 23 24 



15 16 17 IS 19 20 21 22 23 24 

 15 16 17 18 19 20 21 22 23 24 



15 16 i7 is 19 20 21 22 23 24 

 15 16 17 18 19 20 21 22 23 24 

 17 21 



15 16 17 ... 19 20 21 22 23 24 

 15 16 17 18 19 20 21 22 23 24 

 15 16 17 18 19 20 21 22 23 24 



J7 21 24 



15 16 17 18 19 20 21 22 23 24 



15 16 17 20 21 22 23 24 



15 ... 17 18 19 20 21 22 23 24 

 17 ... 19 20 ... 22 ... 24 



15 





17 



18 



19 20 21 22 ... 24 



15 





17 



18 



19 20 21 22 23 24 



15 



16 



17 

 17 





... 20 21 24 



... 20 21 22 23 24 







17 



18 



19 20 21 22 







17 





.. 20 ... 22 ... 24 



15 



16 



17 

 17 



18 



19 20 21 22 23 24 

 ...20 21 22 23 24 

 22 23 24 





S; 



00 



T-l 





irt ir> i> 10 



eO l-H »-H t-H i-H 

 OS »-l i-l l-H l-l tH 



25 26 27 28 29 30 31 32 



25 26 27 28 29 30 31 32 

 25 ... 27 31 32 



25 26 27 28 29 30 31 32 



... 26 



25 26 27 28 29 30 31 32 



25 



25 26 27 28 29 30 ... 32 



25 32 



25 26 27 .. 29 30 31 32 



... ^'U 29 30 31 32 



25 26 27 ... 29 30 31 32 

 27 ... 29 30 31 32 



25 26 27 28 29 30 31 32 

 25 26 27 ... 29 30 ... 32 



32 



25 26 27 28 29 30 31 32 



25 26 27 28 29 30 31 32 



32 



25 26 27 28 29 30 31 32 



... 26 27 ... 29 30 ... 32 



25 26 29 30 31 32 



... 26 29 30 31 ... 



25 26 27 28 29 30 31 32 

 25 26 27 28 29 30 31 ... 



25 26 27 28 31 ... 



30 ... 32 



25 26 27 ... 32 



25 26 27 28 



25 26 27 28 29 30 31 32 



29 30 31 32 



32 



O CO (M 



tHinO'^OSTtft-r-l 



i-HOSi— looosaaoor-i 



B. leachii 



Viviparidae 

 Paludina contecta 

 P. vivipara 



Valyatidse 

 Valvata piscinalis 

 V. macrostoma 

 V. cristata 



Assemaniidae 

 Assemania grayana 



Pomatiidae 

 Cyclostonia elegans 



Aciculidse 

 Acme lineata 



Neritidae 

 Neritina fluviatilis 



Dreissenidae 

 Dieissena polymorpha 



Unionidae 

 Unio pictorum 

 U. tumidus 



Margaritana margaritifera 

 Anodonta cygnea 

 A. anatina 

 Pseudanodonta ,sp. 



Cypenidae 

 SphEerium rivicola 

 S. corneum 

 S. lacustre 

 S. pallidum 

 Pisidium amnicum 

 P. casertanum 

 P. henslowanum 

 P. hibernicum 

 P. lilljeborgi 

 P. milium 

 P. nitidum 

 P. obtusale 

 P. parvulum 

 P. personalum 

 P. pulchellum 

 P. subtruncxtum 

 P. supinum 

 P. tenuilineatum 



Toial species 163 



