40 



Porritt : Ti'uodes aureola near ScarborougJi. 



rock is so conspicuous and well-defined that it is impossible it 

 should have escaped notice before had it been at all common on 

 this coast. 



No. 22. This example (Dalecarlia (?) PorphN^rite) is similar 

 to Nos. 7 and 8 in the former list. 



No. 34 (of which No. 33 is a probable variety) is a rock of 

 some interest. It has long" been known that erratics from the 

 Cheviot hills have wandered down over the eastern portion of 

 our land, leaving their remains scattered thickly over the inter- 

 vening ground in a direct line down to the north bank of the 

 Humber ; and they have also been met with on the south 

 (Lincolnshire) side of this estuary at South Ferriby, but no 

 further. This fact was pointed out to me by Mr. Kendall, who 

 wrote that, when recently in Lincolnshire with Mr. Stather, he 

 was glad to find that the observation of the latter upon the 

 abundance of Cheviot Porphyrites and Tweed Valley Greywacke 

 Sandstones in the Upper Boulder Clay extended to this county, 

 and asking me to work out further details. This, from one 

 cause or another, I had no oportunity of doing until July last, 

 when, amongst the boulders collected, No. 34 turns out to be 

 a fragment of the ice-borne Cheviot Porphyrites I was in search 

 of. Mr. Kendall has also obtained a specimen at Horncastle. 



These Porphyrites would seem to embody the last efforts of 

 the dying-out Ice-age and must be searched for high up on its 

 outer fringes, as Mr. Stather has pointed out in his paper on 

 '"The Boulders of East Yorkshire,"'-" bearing out Mr. Lamplugh's 

 suggestion f 'that the North Sea ice-sheet attained its maximum 

 development and reached farthest inland before the ice flowing 

 from the north-west had reached this part of the coast, and that 

 the North Sea ice dwindled away as the flow from the Pennine 

 Chain and the Cheviots gained strength.' 



The remaining specimens require no special remarks beyond 

 Mr. Sheppard's descriptions. 



* Geol. Mag'., p. 17, Jamiar}- iqoi. 

 I 'Drifts or Flainborouo-h Head," O.J. G.S., XL\ II., p. 428. 



TRICHOPTERA. 

 Tinodes aureola near Scarborough : a Trichopteron new 

 to Yorkshire. —^1 found Tinodes aureola at Hayburn Wyke, 

 where it seemed to be fairly common during the second week of 

 August last. It has not been previously recorded for our 

 county. ^Geo. T. Porritt, Huddersheld, 8th December 1903. 



Naturalists 



