282 
Mr. T. D. A • Cockerell’s Notes on Slugs. 
IT. The Tandonia Section of Amalia. 
The keeled slugs, referred by modern authors to the genus 
Amalia , Moquin-Tandon, were divided by Lessona and 
Pollonera in 1882 into groups — Pirainea, the group of A. 
g agates, and Tandonia, the group of A. carinata and A. mar - 
ginata. A third group, having an incomplete keel, is Mali- 
nastrum , Bourg. ( = Subamalia , Poll., 1 887). The Tandonia 
section is credited by Pollonera with twelve species, but 
several of them are very closely allied — not more distinct, 
indeed, than other races almost universally considered varieties. 
Probably the number of species will be greatly reduced when 
it becomes possible to compare living examples and dissect 
fresh specimens of all of them. 
I give here a list of the recorded forms, with notes : — 
Amalia marginata (Drap.). 
Known by its small spots and banded mantle. There is a 
specimen in the British Museum from Waldeck, received 
from Dr. Heynemann, from which I made the following 
notes : — 
25 millirn. long (in alcohol), narrower than carinata, and 
hardly arched. Sole ochrey ; median area hardly twice as 
broad as one lateral area. Keel straight, ochreous. Body 
ochreous at sides, bluish grey dorsally, with a peppering of 
dark grey points all over (except under mantle and on sole). 
Mantle with lateral dark bands fading away anteriorly. 
This is quite a distinct species and quite different from the 
English slug, carinata , Leach, usually called marginata . I 
have never seen an English example of true marginata , nor 
can I find any evidence of its occurrence in the British 
Islands by searching the literature. The figure and descrip- 
tion by Rimmer (Land and Freshwater Shells of British 
Islands, 1880) belong to the true marginata , but they are 
copied apparently from the French, and have actually no 
reference to an English slug. Heynemann (Die nackt. 
Landpulm. des Erdbodens, 1885) gives A . marginata as 
British, but he was probably misled by British authors. 
Roebuck ( c Science Gossip,’ 1884, p. 78) records var. rustica 
from Gloucestershire ; but it is probable — I think practically 
certain — that he had not the true rustica , Mill., as understood 
in France*, but a variety of A. carinata . 
* Kreglinger, 1870, gives rusticus, Mill., as a synonym of L. ( Lehman - 
nia) maryinatus , Mull. 
