FIELD NOTES. 



BIRDS. 



Fork-Tailed Petrel near Harrogate. ^ — On November 

 4th a specimen of Leach's Fork-tailed Petrel was picked up at 

 Killinghall, near Harrogate, by Mr. T. W. Strother. During the 

 night and early morning the weather was foggy and the bird 

 had no doubt become confused and lost its way, meeting its 

 death by flying against the telegraph wires ; there was no 

 wind. From the size it is probably a female. R. Fortune. 



— : o : — 

 MOLLUSC A. 



Adeorbis subcarinatus at Scarborough. — In examining 

 some shell-sand which I got at Scarborough, I found a speci- 

 men of Adeorbis subcarinatus. This shell does not appear to 

 have been previously recorded for Yorkshire. The nearest 

 locality given by Jeffreys is Aberdeenshire. Its common 

 locality is the South Coast, and the Channel Islands, though 

 it has been found at Lamlash, Bute, and Barmouth. — F. H. 

 Woods. 



Dispersal of Fresh = water Shells. — In March last, Mr. 

 Harold Walsh, of Luddenden, brought to me a number of living 

 specimens of a young fresh- water cockle, which were attached to 

 the legs of a species of fresh- water bug found in a small reservoir 

 situate at an elevation of nearly 1,000 feet on the Middle Mill- 

 stone grits of the Carboniferous rocks at Crag Vale. The reser- 

 voir is fed by a stream arising in the high moorlands to the 

 west of our Halifax Parish. 



The associated insect belongs to the genus Corixa, the shells 

 are all young examples of Pisidium ptisillum (Gmelin). The 

 Corixa were very lively and were nearly all furnished with a 

 shell holding by the grip of its valves to the hind leg, and usually 

 to the trasi of the insect ; in several instances there were two 

 shells, being one to each hind leg. Apparently we have here 

 a provision for the dispersion of the shell by insect agency. 

 Mr. Wallis Kew, in his excellent book on ' The Dispersal of 

 Land and Fresh- Water Shellls,' cites several records of similar 

 phenomena. 



If any one will collect Pisidia during the coming early 

 spring, I feel sure that he will find these curious methods of 

 dispersion commoner than has been hitherto thought. 



My best thanks are due to B. B. Woodward, Esq., of the 

 British Museum, for confirming the names of the specimens. 



W. Cash. 



The New Phytologist for October contains a paper on the ' Influence 

 of the Structure of the Adult Plant upon the Seedling,' by H. F. Wernham. 

 and a Description of two Fossil Prothalli from the Lower Coal Measures ' 

 (of Dulesgate), by R. C. McLean. 



igi2 Dec. I. 



