Yorkshire Naturalists at Dent. 



301 



J5 



brought about by the unequal weathering- of inverted rocks. 

 A line of swallow holes running parallel to and on the west side 

 of these ridges appeared to indicate the actual line of Fault here 

 hidden by accumulated boulder clay. 



The Fault itself was afterwards seen in a little waterless gill 

 near Haycot Farm, the Silurian strata occupying one side of the 

 ill, and the Carboniferous limestone the other. It was thence 

 followed to the River Dee, and, on the next day, was pursued 

 to the north side of the valley to near Helm Gill, where it was 

 finally deserted in favour of fossil hunting in the Coniston 

 limestones, and expeditions to the igneous dykes in the gill. 



Helm Knot was afterwards climbed and many Graptolites 

 were obtained in the grits on the summit. Mr. Sheppard was 

 specially favoured in securing a fine Orthocerus, destined, we 

 believe, to enrich the Hull Museum. From the Coniston Lime- 

 stone also, Mr. E. Hawkesworth secured an exceptionally fine 

 specimen belonging to the Cystid genus Echiiwsphcera. This 

 genus is confined to Ordovician rocks, and examples of it are 

 known in England, the Baltic countries, Belgium, and Bohemia. 

 In its present condition the species, which has been examined 

 by Dr. F. A. Bather, cannot be determined. 



No particular note appears to have been taken of the 

 vertebrates beyond the fact that the Kingfisher was particularly 

 abundant, a large number being observed by different members 

 of the party. 



Mr. J. A. Hargreaves writes: — No systematic attempt was 

 made to search for Mollusca, but advantage was taken of the 

 intervals in the geological excursions, and of one or two walks 

 in the district. 



In addition to the list given on the excursion circular the 

 following were noted : — 



Hyaliiiia fulva. Helix arbusfortuu . 



Vertigo pygmce a. Hyalinia cellaria. 



Cochlicopa liihrica. Azeca tridens. 



At the foot of the hill Siiccinia puiris. 



coming- from Dent Station. All near Dent. 



Balea perversa. On roadside at Arion ater. Several places, 



intervals for two or three Limnea triincatnia var. minor. 



miles. Marsh at Dent Head. 



Altogether he noted 21 species. 



Mr. G. T. Porritt writes that the only Lepidopteron of note 

 was Oporabia filigraminaria, which he found on the moors above 

 Flintergill. The beautiful larvai of Hadena pisi, found by 

 various members, were plentiful. Neuroptera were scarce, and 



1904 October i. 



