Mr. T. D. A. Cockerell's Notes on Slugs. 333 



gagates, but it approaches the latter in its genitalia. The 

 mantle is mottled. Dr. Simroth has considered Doderleini, 

 sicula, and insularis to be synonyms of gagates ; but Mr. 

 Pollonera writes (in litt. Jan. 13, 1891) that to him a specific 

 character of gagates is its lack of spots or bands, and for this 

 reason he cannot accept the pi-oposed synonymy. He also 

 observes that insularis, Doderleini, and the Algerian scap- 

 tobia all have the summit of the keel pale, while in gagates 

 this is of the same colour as the back, except in the var. 

 Benoiti from Messina, which was founded on a single speci- 

 men, and may be an individual abnormity. 



Amalia scaptobia (Bourg.). 



Found in Algeria and referred by Heynemann to gagates. 



Mr. Pollonera writes that it was evidently described from a 

 juvenile, but it is a spotted species, and therefore cannot be 

 gagates. 



Probably A. insularis of Sardinia and Sicily will prove to 

 be a form of scaptobia. 



A. eremiophila (Bourg.) from Algeria and A. atrata (Mab.) 

 from Portugal are species of this section only known to me 

 from what is published concerning them. This completes 

 the series of European forms if we include A. nigricans 

 (Schultz), which has not been identified by modern authors, 

 and A. Monterosati (Bourg.), which is described from the shell 

 alone, and is perhaps A . sicula, over which it has priority. 



b. Atlantic Islands. 



This geographical division will be thought perhaps a rather 

 peculiar one, the more frequent custom being to treat of the 

 islands under the heads of the continents to which they are 

 nearest. Thus the Bermudas, as regards their general fauna, 

 are distinctly American, while Madeira presents affinities with 

 the western Mediterranean region. But so far as regards the 

 slugs now under consideration, it may be said that all the 

 insular forms are very much alike, and as many of the insular 

 occurrences are doubtless the result of accidental introduction 

 by human means, this is not surprising. 



It might well be supposed that the wide distribution of 

 Pirainea in islands and elsewhere was simply the result of 

 accidental importations, and the slight changes from the type 

 observable in many localities are certainly not greater than 

 those which are known to have taken place in the case of 



