30 Mr. Alder's Catalogue of Land and Freslwwater Shells. 



8. Li. peregra, Drap. 



Helix peregra, Mont. 

 H. putris, Turt. Brit. Fauna. 

 In ponds and slow streams ; common. 



I possess specimens of an elongated variety, collected on the Haughs at Redheugh. 

 They answer to the description and figure of the shell published by Capt. Brown, in the 

 Wernerean Society s Transactions, as the Linnaean Helix limosa, 



9. L. ovata, Drap. 



The Rev. W. Mark informs me that he has lately found two specimens of this shell 

 in a pond at Sandyford. 



Gen. PHYSA. 



10. V.fontinalis, Drap. 



Bulla fontinalis, Linn. 

 In ditches at Prestwick Car. 



11. P. hypnorum, Drap. 



Bulla hypnorum, Linn. 

 In ponds and ditches ; frequent. 



Gen. PLANORBIS. 



12. P. contortus, Mull., Drap. 



Helix contorta, Linn. 

 In ditches at Prestwick Car. 



13. P. alius, Mull. 



P. hispidus, Drap. 

 Helix alba, Mont. 

 In ponds and slow streams ; frequent. 



14. P. imbricatus. Mull., Drap. 



Turbo nautileus, Linn. 

 In ponds, not uncommon. 

 The crested variety (P. cristatus, Drap.) also frequently occurs. 



15. P. nitidus, Mull., Lam. 



P. complanatus, Drap. 

 Helix fontana, Mont. 

 In a pond near Redheugh. 



This species, like the preceding, ejects a red liquid when disturbed : a similar secre- 

 tion has long been observed in P. corneus, and is probably common to the whole genus, 



16. P. Vortex, Mull., Drap. 



Helix Vortex, Linn. 

 In ditches, common. 

 Also the var. /3 Drap, (^Helix spirorbis, Mont.y) 



