BEISTOL LAND AND FRESH-WiTER MOLLUSCA. 277 



2. B. Leachii. Sheppard. 



In the Avon (W. W. S.) 



Genus 3. Sydrohia. Hartmann. 



2. H. ventre sa. Montagu. 



Shirehampton, in ditches (T. G. P.) 1864; Avon, at 

 Cook's Folly (W. W. S.) 



3. H. ulvae. 



(*) "Weston-super-Mare, abundant. 



Family III. — Yalvatid^. 



Genus 1. Valvata. Miiller. 



1. V. piscinalis. Miiller. 



In streams at Nailsea and Keynsham (J. «& F. H.), 

 at Clevedon (L. C. J.), {^') Kennet and Avon Canal 

 (W. "W. S.) 



Order II. — Palmobranchiata. (a) Aquatic. 

 Family I. — Limn.mid^. 



Genus 1. Planorhis. Guettard. 



2. P. nitidus. Miiller. 



Shirehampton (E. C. W.), Westbury and Bedminster 

 (W. W. S.) 



3. P. nautileus. Linne. 



Pond near Horfield, very sparingly (J. & F. H.) ; 

 Bedminster (W*. W. S.) 



4. P. albus. Muller. 



Near Westbury (E. C. "W.), Durdham Down 

 (W. W. S,) 



6. P. spirorbis. Miiller. 



Durdbam Down and pond at Messrs. Garraway's 

 Gardens (E. C. J".), Stapleton (T. G. P.), Shire- 

 hampton (E. C. W.), Clevedon (L. C. J.), Horfield, 

 (*) Westbury, Bedminster (W, W. S.) 



