Proceedings of the General Meetings for Scientific Business of the Zoological Society of London 1897

Page 510

448 MR. W. E. COLLINGE ON EUROPEAN SLUGS. [May 4, CLASSIFICATION. Family ARIONID^, Gray, 1840. Subfam. ARIONINCE, W. G. Binney, 1864. Genus ARION, Ferussac, 1819. GROUP I. 1. A. ater, Linne, 1758. (Continent.) 2. A. rufus, Linne, 1758. (Continent.) 3. A. empiricorum, Ferussac, 1819. (British Isles and Continent.) 4. A. lusitanicus, Mabille, 1868. (British Isles and Continent.) 5. A. brevierei, Pollonera, 1887. (Continent.) 6. A. dasilvse, Pollonera, 1887. (Continent.) 7. A. aggericola, Mabille, 1870 \ (Continent.) 8. A. flagellus, Collinge, 1893. (Ireland and Con­tinent.) G R O U P II. 9. A. subfuscus, Draparnaud, 1805. (British Isles and Continent.) 10. A. fuscus, Miiller, 1774. (Continent.) 11. A. bavayi, Pollonera, 1887. (Continent.) 12. A. pegorarii, Lessona & Pollonera, 1882. (Con­tinent. ) 13. A. flavus, Nilsson, 1822. (Continent.) GROUP III. 14. A. hortensis, Ferussac, 1819. (British Isles and Continent.) 15. A. anthracius, Bourguignat, 1866. (Continent.) 16. A. cseruleus, Coliinge, 1897. (British Isles.) 17. A. cottianus, Pollonera, 1887. (British Isles? a Continent.) 18. A. nilssoni, Pollonera, 1887. (Continent.) 19. A. alpinus, Pollonera, 1887. (Continent.) 20. A. hessei, Simroth, 1894. (Continent.) 21. A. elongatus, Collinge, 1894. (British Isles.) GROUP IV. 22. A. fasciatus, Nilsson, 1822. (British Isles and Continent.) 23. A. subcarinatus, Pollonera, 1885. (Continent.) 1 At present this must be regarded as a doubtful species. Mabille placed it in the A. subfuscus group (16). but Pollonera (21) states that from the radula it belongs to tbe A. ater group, being a form allied to A. brevierei, Poll., from which it differs by its smaller size, brighter colour, small receptaculum seminis, shorter receptacular duct, and by the great length of the sperm-duct.