LAND AND FRESH WATER MOLLUSCA OF THE EAST RIDING. 1 23 



G. Roberts (and J. Beanland). — Mollusca of Wressle and 

 neighbourhood. Nat. vol. xi. (1886), pp. 311-314. 



Wm. Nelson and J. W. Taylor. — List of Yorkshire 

 Mollusca : pt. 1, 1877, Sphcerium to Anodon ; pt. 2, 

 1880 (published 1883), Dreissensia toValvata; pt. 3, 

 1883 (published 1885), Valvata to PL spirorbis ; 

 pt. 4, 1884 (published 1886), PL vortex to PL 

 contorlus ; pt. 5, 1890 (published 1891), Physa to 

 L. peregra. (Trans. Yorks. Nat. Union). 



E. P. Blackburn (Rev.). — Mollusca of Driffield and 

 neighbourhood. Nat. vol. xxix. (1904). 



The above are referred to in the list by initials or name 

 only. 



Additional records are to be found in the many notes and 

 papers contributed to the Journal of Conchology and the 

 Naturalist by Messrs. J. W. Taylor, Wm. Nelson, W. 

 Denison Roebuck, W. C. Hey, L. B. Ross, F. W. Fierke, 

 and others ; and Messrs. Hey and Fierke have written 

 articles on the Mollusca of Flamborough and Hornsea for 

 " Flamborough, Village and Headland" (1894), and Fretwell's 

 Guide to Hornsea (no date) respectively. Notes by the 

 compiler of the present list have been published in the 

 "Transactions of the Hull Scientific and Field Naturalists' 

 Club," vols. i. and iii. 



The accounts of the visits of the Yorkshire Naturalists' 

 Union to various localities in the East Riding furnish many 

 records or confirmatory evidence of the existence of rare 

 species, on the authority of Messrs. J. W. Taylor, W. D. 

 Roebuck, and other West Riding conchologists. The 

 following table gives what information it has been possible 

 to collect with regard to these excursions ; but in 

 •estimating the value of records in excursion circulars, it 

 must be remembered that the more recent of these merely 

 summarise the recorded mollusca of a wide area, often 

 without definite localities and in many cases not in the 

 ■district visited : — 



