THE BRITISH NATURALIST. 



267 



Scymnus frontalis, Telmatoi)hiliis caricis, Mycetoporus Reyi, M. splendidus, 

 Comiriis lividus, Aphodiiis subterraneus, A. prodvomus, Gronops lunahts, 

 and many more. I was surprised on visiting the same locality a day 

 or two later to find that, with the exception of a few common 

 Tachypori, there was nothing left in the refuse. -A. Ford. 



MoUusca.— Notes . 



Bythinia tentaculata L. seems to be spreading in America very 

 rapidly. The latest recorded locality is Black Lake in the State of 

 Michigan, so that it is well started on its Western march. Another 

 English species that has asserted its fitness pre-eminently as a 

 colonist is Helix aspevsa MiilL, and this shell has already reached the 

 Pacific coast of the United States, having been collected 12 years ago 

 at San Jose in California by my friend Dr. Yates. There is hardly a 

 country in the world, in fact, where H. aspersa has not turned up. 

 Specimens from Melbourne, Victoria, were kindly communicated to 

 me some time ago by Mr. Standen. Speaking of Helix aspevsa Miill. 

 reminds me that I never published the discovery of a colony of the 

 little known var. vivecens Req. in Guernsey about 5 years ago, at least 

 such the shells were considered to be by Mr. W. H. Heathcote and 

 myself at the time. About 4 adults and 7 or 8 immature specimens 

 occurred, and, while possessing translucent marking of the regular 

 aspersa type, they were in coloration undoubtedly a pale uniform green : 

 shell of normal size and very thin but not at all of the var. tenuior type. 

 The habitat was a likely-looking spot on the edge of Bordeaux 

 Harbour, with loose stones and bits of wall loosely built, and with it 

 lived a large light-coloured form of Helix pisana with a decided 

 tendency to efascation. A not very thorough search last August 

 failed to produce any aspersa of this variety, though the pisana had 

 increased markedly in numbers. The latter are a very distinct race 

 from their kindred on the west coast at Vazon Bay, where one quickly 

 recognises the darker-coloured, smaller, and more Tenby form. The 

 question of the introduction and naturalization of Helix pisana into^the 

 island by Dr. Lukis is fully explained in Vol. II of the "Journal of 

 Conchology,'' by Messrs. Rimmer, Cooke, and Tye. 



In the current number of tfie "Nautilus" Mr. T. D. A. Cocker 11 

 has a synopsis of the named varieties oi Agriolimax agrestis, L. This 

 ubiquitous species is now placed on record for the Pacific coast 



