414 Miscellaneous. 



with the similarity of recent limpet shells which are secreted by 

 widely different animals, it is almost inconceivable that the Silurian 

 form should have any closely allied recent representative. The 

 rhythmical manner in which the adductor scars of Tryhlidium are 

 arranged in pairs clearly indicates a peculiar disposition of the 

 organs, which might indeed have paralleled in some particulars the 

 organization of some of the Chitons of that ancient time. 



For the rest, many of the ancient limpets are represented by shells 

 which might well have belonged to Lepefa or Acmcea, yet of the 

 relations of which, as in the case of many recent limpets, we are 

 not permitted to arrive at any dogmatic opinion for want of the 

 requisite data, a deficiency which, in the case of the fossils, must 

 remain for ever unsupplied. — Proc. Acad. Nat. Sci. Pliilad. 1893, 

 p. 285. 



Oa the Occurrence of Arion lusitanicus, Mah., in the British Isles, 

 and Descriptions of Foti.r new Varieties. By Walter E. Collinge, 

 Mason College, Birmingham. 



Through the kindness of Mr. H. Burnley Rathborne, of Dublin, I 

 have recently received some sijecimens of this interesting species of 

 Anon, collected at Bevihenen, Bantry Bay, Ireland. 



Dr. Scharff, in his work upon the Irish slugs *, mentions a variety 

 of A. empiricornm, Fer., in which the retractor muscles " are 

 attached quite close to the receptaculum and the upper portion of 

 the oviduct ; " this, I have previously stated t, I consider to be 

 A. Ivsitanicus, Mab. Some months ago I examined specimens from 

 Ireland and compared them with continental examples, and felt 

 sure that I was correct in assigning the former to this species. 1 

 hope shortly to obtain further supplies of material, and will then 

 describe in more detail the anatomy. References to the anatomy 

 &c. are given by Pollonera J, Simroth§, and myself ||. 



Whilst recording this interesting addition to the fauna of the 

 British Isles I take the opportunity of describing four new colour 

 variations. 



Biifescens, var. nov. 



Whole of body a dark red. Sides of body bandless. Sent with 

 type by Mr. Bathborne. 



Nigrescens, var. nov. 



Described from a black specimen sent with type by Mr. Bath- 

 borne. I would, however, suggest that the name should include all 



* Trans. Rov. Dublin Soc. 1891, ser. 2, vol. iv. p. 539. 

 t 'The Conchologist,' 1893, vol. ii. p. 7. 



t Atti Ace. Sci. di Torino, 1889, pp. 405, 406, pi. ix. figs. l-6:,*il80 

 Boll. d. i\[us. Zool. ed Anat. comp. Torino, 1890, vol. v. no. 87. - 

 § Die Nachtsehnecken d. Port. Fauna, 1891. 

 II ' The Conchologist.' 1892, vol. ii. p. 116. 



