No. 3. SEPTEMBER 29th, 1892. Vol. II. 



THE 



% (®mxtzxi\) journal of gtalarologg. 



EDITED BY 



WALTER E. COLLINGE, 



United College, St. Andrews ; 

 WITH THE ASSISTANCE IN SPECIAL DEPARTMENTS OF 



Rev. A. H. COOKE, M.A., F.Z.S., 

 King's College, Cambridge ; 



WALTER GARSTANG, M.A., 

 Marine Biological Association, Plymouth ; 



R. F. SCHARFF, Ph.D., B.Sc, M.R.I.A., E. RUTHVEN SYKES, B.A., 



Natural History Museum, Dublin. Weymouth. 



(Contents : page 



On the Origin of the Genera of Land and Freshwater Mollusca. — 



Rev. A. H. Cooke, M.A., F.Z.S. 41 

 Notes on the Structure and Habits of Jorunna Johnstoni. — 



Walter Garstang, M.A. 49 

 An Additional Occurrence of Pleurophyllidia loveni in Britain. — 



Prof. W. A. Herdman, D.Sc, F.R.S., &c. 52 



On the Periostracum of Helix arbustorum, Mull. ... G. Sherriff Tye. 53 

 Some Remarks on the Colour Changes in Arion intermedins, Normand. — 



W. A. Gain. 55 



A Review of the Arionidce of the British Isles. ... Walter E. Collinge. 56 



Current Literature. Review: Sowerby's "Marine Shells of South Africa." — H. 66 



Notes: New Varieties of Californian Slugs. — T. D. A. Cockerell, F.Z.S. , 



F. E.S. ; Pleitrophyllidia loveni in Britain. — F. G. Greisbach. ... 72 



Editor's Notes ... ... 72 



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