24 NELSON AND TAYLOR : ON YORKSHIRE MOLLUSCA. 



spots and streaks more or less closely agglomerated ; the^ 

 blackish and pale-brown bands are not exactly coincident 

 with each other except at the aperture, and neither are on the 

 same spiral plane as the rows of hairs. Three fleshy processes 

 of the mantle which are placed correspondingly to the rows of 

 bristles would appear to be the organs of their formation. 



Mr. W. G. Binney, in " Land and Fresh Water Shells of 

 North America," says, in speaking of Vivipara contectoides 

 Binney, " It has been by some authors considered identical 

 with that species \P. contecta Millet], and with the exception 

 that the American form has four spiral bands upon the body 

 whorl, while the European is described as having but three, I 

 can detect no specific difference between them. It is more 

 upon its geographical distribution that I base my opinion of its 

 being distinct." 



We would point out that P. contecta not only differs in its 

 larger size, but has a greater number of whorls, a much more 

 open umbilicus, and the colour bands are somewhat differently 

 disposed, and we certainly regard it as distinct from contectoides 

 Binney. 



Several varieties have been described by various concholo- 

 gists but none have as yet been recorded for our county. 



3. Vale of York — Formerly abundant in a ditch near Clementhorpe, York, 



but none have been found of late years, S. W. North. 



4. Number — The Rev. R. D. Maxwell includes this in his List of Goole 



Shells, but as the Goole district is defined to include an area of 

 twenty miles radius, it is quite possible that his specimens were 

 collected at one of the other localities mentioned^ or even in 

 Lincolnshire, a county in which the species is abundant. 



5. Hatfield and Thome — Gravel Drain, W. Eagle Clarke ! 



7. Went Vale — Ditches near Askern Pool, E. Lankester, 1842 ; several 

 fresh but dead shells in the stream running from and in the pool at 

 Askern, in 1881, H.S.! 



10. Colne — Huddersfield, introduced, J.Wh. [probably from Lancashire]. 



22. Upper Derwent — The late Mr. W. Bean records this species for Scar- 

 borough, but it is very probable the locality he obtained his speci- 

 mens from was near York. It does not appear in the list of 

 Scarborough shells, kindly furnished by Mr. J. H. Ashford. 



Trans.Y.N.U., 1880, (pub. X883). Series C 



