1892.] 



THE BRITISH NATURALIST. 



177 



I have omitted from the present hst a large number of minor 

 varieties, while those imperfectly known or at all doubtful from few 

 occurrences, &c., or whose claim to rank as species or varieties is 

 disputed, are printed m italics. The following are the more important 

 changes, additions, &c. : Limax cinereo-niger, Wolf, is placed as a 

 variety of L. maxlmus, Simroth and Scharff having both conclusively 

 shown that there is no anatomical difference between the two forms. 

 In the genus Anialia, Moq., Pollonera's sections have been introduced. 

 The TestncellidcB are a family which have not as yet received much 

 attention in this country. I have records of a number of varieties, 

 but hesitate introducing the same until they are found to be of more 

 general occurrence. Many important additions and changes are made 

 in the Arionidce. Pollonera, the highest authority on this family, 

 thinks our large black Avion is undoubtedly the A. empiricomm, Fer. 

 The many red and brown varieties of this species have been grouped 

 under the v, rufus, Fer. The var. hocagei is an interesting addition. 

 Under A. suhftisciis I am introducing two new varieties which will be 

 fully described in my "Review of the Arionid^E oi the British Isles." 

 Avion cottiamis, Poll., was first found in this country by Mr. E. W. 

 Swanton, also A. celticiis, Poll. A. horteiisis, v. ccsvuleus, Collinge, 

 may be looked upon as a species in course of formation. A. circum- 

 scfiphis^ Johnst., seems to vary in two well-marked directions. I have 

 not, as yet, been able to describe the occurrence of A . lusitaniczis, 

 Mabille, specimens having only just come to hand. Hitherto it has 

 been confounded with A. empiricorum, Fer. ' 



The method I adopt for killing and permanently preserving slugs 

 is as follows : After measuring the specimens, while still alive, and 

 making notes as to form, colour, slime, &c., &c. I place them in a 20 

 ounce beaker of water, full to the brim, over which is placed a glass 

 disc with a v/eight upon it. In this they are allowed to remain until 

 dead, usually about 48 hours. Ten ounces of 12^% alcohol is then 

 added, and at the end of four hours, the same quantity of 30 % or 40% 

 alcohol, m which they are allowed to remain another four hours, and 

 then transferred to 60 % alcohol, where they may remain for almost 

 any length of time. I usually, however, after two or three days 

 transfer to 90 % alcohol. It is as well to re-measure the specimens 

 after preparing as above. 



As I propose to re-publish this list from time to time, any 

 suggestions for improving the same, or notices of omissions, ISic, will 

 be thankfully received. 



