SCHARFF : AFFINITIES OF THE GENERA LIMAX, ARION, AND HELIX. 83 



31 Pollonera, Carlo. — " Arionidcs de la Region Palearctique." 



Boll. Mus. Zool., Torino, vol. v, No. 87, 1890. 



32 Do. u Sur Liniacidi dell 'Algeria." Boll. Mus. Zool. 



Torino, vol. vi, No. 100, 1891. 



33 Rolleston, George. — "Note on the Geog. Distrib. of L. agrestis 



and A. hortensis." Zool. Anzeiger, vol. ii, p. 400. 



R. F. — " Arton miniums (Simroth) a British Slug." 

 Journ. Conch., p. 267, 1889-91. 

 " The Slugs of Ireland." Trans. Roy. Dublin Soc, 



vol. iv., ser. ii, p. 513, 1891. 

 " Note on the Affinities of the Genera Limax, Arion, 



and Helix.'''' The Conchologist, vol. ii, p. 14, 



1892. 

 " On the Affinities of the Genera Limax, Arion, and 



Helix.''' The Conchologist, vol. ii, p. 83, 1892. 

 " The Irish Land and Freshwater Mollusca." Irish 



Nat, vol. i, 1892. 

 H. — " Versuch einer Naturgesch. d. deutsch. Nacht- 



schnecken." Zeit. f. wiss. Zool., vol. xlii, 1885. 

 " Uber bekannte und neue palaearkt. Nactschnecken." 



Jahrb. d. deutsch. Malak. Gesell., vol. xiii, 



1886. 



41 Do. " Die Nachtschnecken der portugiesisch-azorischen 



Fauna." Nova Acta Acad. CL.CG. Nat. Cur., 

 vol. lvi, 1 89 1. 



42 Tryon, G. W.—" Manual of Conchology," ser. ii, vol. i, 1885. 



ON THE AFFINITIES OF THE GENERA LIMAX, 

 ARION, AND HELIX. 



By R. F. SCHARFF, Ph.D., B.Sc, M.R.I.A., 



Natural History Museum, Dublin. 



In reply to my note on the affinities of the genera Limax, Arion, 

 and Helix, Mr. Cockerell states that he does not think any 

 systematic conchologist would be found to unite Limax and its allies 

 with Helix in one family. This remark shows that Mr. Cockerell is 

 not acquainted with the current literature on the subject, for this 

 is the very arrangement which has been adopted in the most 

 important work ever published on slugs, viz., that of Simroth. 

 According to Mr. Cockerell, however, the true result of the 

 researches of Simroth and others is that the Arionida are more 



