e72 Yorkshire Naturalists at Burnsall. 
apparently ventured into the open. We had, however, the 
satisfaction of seeing the havoc wrought on these moors by the 
cloud-burst of five years ago; where gullies more than twelve 
feet in depth had been formed in the course of a few hours. 
ConcHoLocy.—Mr. J. E. Crowther writes :—Starting from 
Bolton Abbey station the conchologists visited Trollers Ghyll. 
The only live water shell noted during the day was Limnea 
pereger in the conduit belonging to Skyreholme Mill, though dead 
shells of this species, along with L. truncatula, were found. on 
the site of the old dam. Ona wall near the entrance to Trollers 
Ghyll, Balia perversa and Pyramidula rupestris were found spat- 
ingly, and in an adjoining wet place was Agriolimax levis. 
Among the screes and the stones on the slope of the disused 
dam, Cepea nemoralis, Hygromia granulata, H. hispida and 
H.rufescens occurred in small numbers. In the same locality 
Arion ater, with its var. plumbea, A. fasciatus and Agriolimax 
agrestis, both the common form and the var. violacea, were 
more or less abundant. On a wall by the riverside near 
_Burnsall the var. nigrescens of Helicigona lapicida, in company 
with Pirostoma cravenensis was fairly plentiful. Inthe afternoon, 
near Lythe Plantation, a search was made for living examples 
of Pomatia elegans, dead shells of which have been collected 
many times, but although they were again fairly plentiful 
no live specimens were found, and the conchologists finally 
came to the conclusion that this species only occurs here in a 
fossil form and is washed out of the soil by the heavy rains. 
Helicella itala, Vitria helvetica, Cepea nemoralis and C. 
hortensis, Helicigona lapicida and others were all more or less 
common near this place. A noticeable feature was the large 
size of Agriolimax agrestis which was plentiful all over the dis- 
trict traversed. Altogether thirty-four species and four 
varieties were noted, viz., seven slugs, twenty-five land shells 
and two freshwater species, as follows :— 
A griolimax agrestis. Helicella ttala. 
r) var. violacea. Hygromia granulata. 
J levis. = hispida. 
Avion ater. Ye vufescens. 
» var. plumbea. Helicigona lapicida var. nigrescens. 
“ intermedius. Arvianta arvbustorum. 
»,  hortensis. Cepea nemoralts. 
) fasGuatus. | hortensts. 
var. subfusca. | Ena obscura. 
Vitvina pellucida. | Cochlicopa lubrica. 
Vitria cellaria. | Lauria cylindracea. 
», helvetica. | Balea perversa. 
, alliaria. | Ptrostoma bidentata. 
,, nitidula. a cvavenensts. 
» pura. | Carychium minimum. 
crvstallina. Pomatia elegans. 
Euconulus fulvus. Limnea pereger. 
Pyvamidula vupestris. » tvuncatula. 
votundata. 
2 
Naturalist, 
