20 Quarterly Journal of Gonchology. 



PlanorlDis nautileus var cristata. — Common with the type. 

 Planorhis albus Midler. — Common throughout. Fine in Hems- 

 worth reservoir. 



Planorbis glaber Jeffrey s. — Abundant in a fishpond in Ackworth 

 park, and there only. 



Planorbis spirorbis Midler. —Common throughout. 

 Planorbis vortex Linne. — Common throughout. 

 Planorbis carinatus Midler. — Mill pond, Ackworth ; not common. 

 Planorbis complanatus Linne. — Common in several parts. 

 Physa lijrpnoriim Linne. — Moderately common in ditches, but not 

 everywhere. 



Physa fontinalis Linne. — Generally distributed. 

 Limnsea peregrra Midler. — Common throughout. 

 Limnaea anricularia Linne. — Common in Winterset and Hems- 

 worth resei-voirs. 



Limnaea palustris Midler. — In small field pools near Hasel Green. 

 Limnsea truncatula Midler. — Common throughout. 

 Limnsea glabra Midler. — Very local. Abundant in one pond near 

 Hasel Green. 



Ancylus fliiviatilis Midler. — River Went and smaller streams. 

 Ancylus iacnstris Linne. — Common on the stems of the water 

 flag in one or two ponds. 



Arion ater Linne. — Common throughoiit. 

 Arion Iiortensis Fe'rnssac. — Not uncommon in various parts. 

 Limax marginatus Midler. — Several found on one occasion upon a 

 stone wall at Ackworth after rain. 



Limax agrestis Linne. — Too common everywhere. 

 Limax maximus Linne. — Common in most parts. 

 Succinea putris Linne. — Tolerably common, but small. 

 Succinea elegans Eisso. — In profusion on the banks of Hemsworth 

 reservoir. 



Vitrina pellucida Midler. — Common throughout. 

 Zonites cellarius Midler. — Common throughout. 

 Zonites alliarins Miller. — Occasional throughout. 

 Zonites glaber Studer. — Not yet found within the district. Nearest 

 recorded locality is a wood near Conisbro' Castle, Doncaster. 

 Zonites nitidulus Draparnaud. — Common throughout. 

 Zonites nitidulus var nitens. — More common than the typical form, 

 Zonites purus Alder. — Common throughout. 

 Zonites radiatulus. — Found sparingly with Z. jyurus. 

 Zonites nitidus Midler. — Abundant by Hemsworth reservoir. 

 Zonites excavatus Bean. — In a wood near Winterset reservoir ; 

 rare. 



Zonites crystallinus Midler. — Common throughout. 

 Zonites fulvus Midler. — Found occasionally in woods. 

 Helix aculeata Midler. — Common in Went Vale ; less common 

 elsewhere. 



Helix aspersa Midler. — Common throughout. 

 Helix nemoralis Linne. — Common throughout. 



