LAND AND FRESH-WATER MOLLTTSCA OF THIRSK. 185 



species, varieties also occur which may probably be the H. concinna and H. 

 depilata of authors. 



Helix rufescens, Penn. Only two specimens have been procured ; one near 

 Hawnby ! — J. Foggitt ; and another near Thorpfield ! — George R. Bakdr. 



Helix virgata, Mont. Wood-end, near Thirsk. — O. R. Baker. Hedge bank 

 between Thirsk and the railway station. 



Helix caperata, Mont. Dry bank between Hawnby and Rievaulx. 



Helix ericetorum, Mill. Hedge bank between Thirsk and the railway station. 



Zonites rotundatus. Gray. Not unfrequent. In a wood below Whitsuncliffe. 

 at an elevation of upwards of 900' feet. 



Zonites umbilicatus, Gray. Amongst Encalypta streptocarpa, house roof at 

 Boltby!— in. W.K.Long. 



Zonites alliarius, Oray^ Not uncommon amongst moss, and under stones, 

 &c. R. W. K. Long informs me that he finds it in gardens at the roots of 

 carnations, in great abundance. 



Zonites cellarius, Gray. Not unfrequent. 



Zonites purus. Gray. Common amongst moss, &c. 



Zonites nitidulus, Gray. In similar situations. 



Zonites Ineidus, Gray. In similar situations. 



Zonites crystallinus, Gray. In similar situations, 



Suecinea putris, Flem. Frequent in moist situations, on the banks of 

 streams, and occasionally in the water adhering to aquatic plants. I have 

 noticed a Suecinea on nettles, (roadside between Thirsk and Sutton,) which I 

 imagine may be the 8. Pfeifferi of Rossmdsler. 



Bulimus obseurus, Drap. On decayed hawthorn roots; bank between 

 Thirsk and the railway station ; bank between Hawnby and Rievaulx. 



Zua lubriea, Leach. Very common amongst moss, &c. I have found this 

 species at an elevation of about 900 feet. 



Azeca tridens, Leach. Plentiful at the roots of trees at Rainton heights. 

 (Elevation 900 feet.) 



Pupa umbilicata, Drap. Not uncommon under stones in the neighbourhood 

 of Rievaulx, Boltby Glen, Flazendale, and other localities. ^ 



Pupa marginata, Drap. Bank, between Hornby and Rievaulx, in company 

 with Helix caperata. 



Vertigo edentula, Gray. R. W. K. Long found a single specimen at Rainton 

 heights. 



Clausilia hidens, Drap. At the roots of trees near Feliskirk ! — G. R. Baker. 



Clausilia nigricans, Jeff. Frequentlj" in similar situations to the preceding 

 species. In a wood below Whitsuncliffe, at an elevation of nearly 1000 

 feet. 



Carychium minimum, Leach. Common at tlie roots of grass, &c. 



Limneus auricularius, Drap. One specimen from Sowerby ings, near 

 Thirsk. 



