264 ROEBUCK: THE CONCHOLOOY OF MAI, HAM. 



factory plan of appending the names of my authorities to the various 

 records quoted. 



The total number of species here placed on record is 41, of 

 which only three are slugs, 26 are terrestrial, and 12 fluviatile forms. 

 To these may be added Helix sericea, which Rev. W. C. Hey has 

 found at Janet's Cave. There are several species of land shells not 

 yet on record, which may be confidently expected as a result of more 

 extended and systematic research. No attention whatever has been 

 paid to the slugs, the number of which will certainly be largely 

 increased when they are sought after with any degree of attention. 

 Arion ater. Street Gate above Gordale, on slate rock, at 1,300 ft. 



alt.; W.D.R. 

 Litnax arborum. Gordale Scar ; W. Nelson. 

 Limax agrestis. Ascends to 1,000 ft. above Malham Cove. 

 Succinea putris. A common species. Road between Malham 



and Bell Busk; W.D.R. Common in marsh at Airton, close 



to river; W. West. Gordale Head, at 1,300 ft. alt, incrusted 



specimens; W. West. Malham Tarn Moss, alt. 1,300 ft.; 



W. West. 



The var. limnoidea has been found at Malham ; W. West. 

 Succinea elegans. Has been once obtained. Malham, at 



1,300 ft. alt.; W. West. 

 Vitrina pellucida. Has only once been recorded, though it is 



doubtless common. Malham, on limestone ; W. West. 

 Zonites cellarius. Not uncommon. Kirkby Malham ; W. Nelson. 



Malham ; W. West. Gordale Beck ; W. West. 

 Zonites alliarius. A common species. Kirkby Malham ; 



W. Nelson. Malham ; W. West. Hanlith ; W. West. Street 



Gate, Gordale Beck, on Silurian rocks, at 1,300 ft. alt. ; W.D.R. 

 Zonites glaber. One record. Gordale Scar ; W. C. Hey. 

 Zonites purus. Malham ; W. West. Base of Gordale Scar ; 



W. West. 

 Zonites radiatulus. On Malham Tarn Moss, at 1,300 ft. alt., 



amongst Encalypta and other mosses ; W. West. 

 Zonites crystallinus. A commonly-occurring species. Malham ; 



W. West. Rock-crevices above Malham Cove ; W. West. 



Near Malham Tarn, at 1,300 ft. alt. ; W. West. Street Gate, 



above Gordale, on Silurian rocks, at 1,300 ft. alt. ; J. D. Butterell 



and W.D.R. Close under Gordale Scar; W. West. 

 Helix nemoralis. Not uncommon. Gordale Scar ; W. Nelson. 



Kirkby Malham ; W. Nelson. Common at Malham, libellula 



00000 and 12345 ; W. West. 



Naturalist, 



