bibliography: mollusca, 1886-87. 



259 



C. H. PiERSON. York Mid W. 



Clausilia rug^osa var. gracilior at Clapham, Yorkshire [found Aug. 1884, 

 not far from the Church]. Journ. of Conch., April and July 1887, v. 183 

 and 205. 



[C. H. PiERSON.] York Mid W. 



[Shells at Addingham, April nth, 1887; Zojtites cellarhis, Z. nitiduliis, Z. 

 puriis and v. margaritacea, Z. glaber, Azeca tridens and var. crystallina, and 

 Ziio]. Journ. of Conch., July 1887, v. 207. 



[C. H. PiERSON.] York Mid W., York S.W. 



[Unio tumidus and Anodonta cygnea from mud-heaps on the banks of the 

 Canal at Kirkstall ; and A. cygnea and var. rostrata from Roundhay, near 

 Leeds]. Journ. of Conch., July 1887, v. 209. 



H. Pollard. York N.E. 



Land and Fresh-water Shells in the neighbourhood of Whitby [a full and 

 detailed list, with localities and introductory remarks, of five slugs, twenty-six 

 land and ten fresh-water shells (altogether forty-one species) found in the 

 valley of the Yorkshire Esk. which is on the whole an unfavourable district]. 

 Nat., May 1887, pp. 134-138. 



T. Mei.lard Reade. Lane. S. 



Notes on a Bed of Fresh -water Shells and a chipped flint lately found at 

 the Alt Mouth. [The shells, consisting of ^ Lyninezis lymiied! ^ L. periger\ 

 Cyclas cornea, and Planorbis spirorbis, were crowded in a bed of mixed peat, 

 sand, and mud ; immediately under the sand-hills, close to this bed, a small 

 flint flake was found.] Proc. Liverpool Geol. Soc. , Part 2 of vol. v. (1886), 

 PP- 137-139- 



Hugh Richardson. York Mid W. 



Mollusca of the Neighbourhood of Clapham, Yorkshire [found by 

 J. R. B. Tomlin, M. C. Plughes, and the writer ; the list includes 41 species 

 and one or two varieties]. Journ. of Conch., April 1886, v. 60-61. 



Hugh Richardson. York N.E., York S.W., York Mid W. 



Hints to Shell-Collectors [with notes on Achatina in Ouse rubbish at Clifton 

 Ings, York, Vertigo mimdissima near Ackworth, Azeca and Pupa timbilicata 

 found at York, Clausilia dubia at Ackworth, Physa Jiypnortim at Bishopthorpe, 

 Uiiio, Anodon, Neritiiia, Pahuiina, and all four species of Sphc€riti7n at York, 

 and Helix lapicida near Ackworth]. Nat. Hist. Journ., June 15th, 1886, x. 

 89-93- 



Hugh Richardson. York S.W. 



The Shells of Ackworth and Went Vale [The first part is devoted to 

 explanation, nomenclature, verification of records, and varieties, and a copious 

 resume of authorities, not only bibliographical, but with indications of con- 

 tributors of hitherto unpublished notes]. Nat. Hist. Journ., Feb. 15th, 1887, 

 xi. 1-4. [The second instalment defines the district, and describes the various 

 localities within and closely adjoining, with notice under each of what is 

 there found]. Nat. Hist. Journ., March 15th, 1887, xi. 27-30 (with ma]:) of 

 district). [The list of species includes 83 species and 16 more within square 

 brackets as found immediately outside the district]. Nat. Hist. Journ, April 

 15th, 1887, xi. 50-53; May i6th, xi. 76-77; June 15th, xi. 101-104 ; Sep. 

 15th, xi. 122-125; Oct. 15th, xi. 147-153; Nov. 15th, xi. 176-179; 

 Dec. 15th, xi. 200-203. 



Geo. Roberts. York S.W. 



Achatina acicula and its occurrence near Wakefield [at Newton, and in 

 the town, on Carboniferous Sandstone]. Nat., Sep. 1885, p. 321. 



G. Roberts. York Mid W. 



Conchological Difficulties [in continuation of discussion on naming variations; 

 reference made to diflerence in colour of Helix rufescens, due to environment, 



in Craven and other parts of Yorksliire, etc.]. Zool., Jan. 18S6, pp. 31-32. 



Sept. 1888. 



