AZOREAN GROUP. 9 



Habitat ins. oinnes (sec. Morelet et Drouet) ; sub lapidibus 

 foliisque emortuis, vulgaris. 



The Avion outer, Linn. ( — rufus, Linn., — eiwpiricorum, 

 Fer.), which is so general throughout Europe and which occurs 

 also at Madeira, appears to have become established in the 

 Azores, — where, according to Morelet and Drouet, it inhabits all 

 the islands of the archipelago. 



Although seldom quite black (as its name would imply), 

 the A. ater has nevertheless an occasional dark variety, or state. 

 It is more often (indeed in Madeira almost universally) of a 

 dull ochreous- or olivaceous-brown, with the edge of its pedal 

 disk (which is entirely visible from above) of a reddish-yellow 

 inclining to orange and transversely striped with regular but 

 remote dusky lines — which are sometimes very distinct, but at 

 others obscure. As in the Arions generally, this slug has its 

 body totally unkeeled, and furnished at the tip with a mucous 

 pore or gland, its respiratory orifice anterior in position, and 

 its shield (which is even, and not wrinkled — at any rate when 

 the animal is fully extended) closely contiguous to the head in 

 front. 



Arion fuscatus. 



Arion fuscatus, Fer., Hist. 65. t. 2, f. 7. 

 „ „ Morel., Hist. Nat. des Acor. 137 (1860) 



„ fuscus, Drouet, Faun. Acor. 140 (1861) 



Habitat S. Miguel ; juxta Ponta Delgada et Pico do Fogo 

 (sec. Morelet) deprehensus. 



A European Avion, which according to Morelet and Drouet 

 occurs sparingly around Ponta Delgada in S. Miguel, and like- 

 wise (as stated by the former) on the Pico do Fogo. By 

 Drouet it is identified with the Limax fuscus of Muller, but 

 by Morelet with Ferussac's Arion fuscatus. 



Arion subfuscus. 



Limax subfuscus, Drap., Hist. Nat. 125. pi. 9. f. 8 (1805) 

 Arion subfuscus, Morel., Hist. Nat. des Acor. 138 (1860) 

 „ „ Drouet, Faun. Acor. 140 (1861) 



Habitat ins. omnes (testibus Morelet et Drouet); vulgaris 

 in S. Miguel (sec. Drouet). 



Likewise a European species, and one which appears to be 

 common at the Azores, — according at any rate to Morelet and 

 Drouet, who state that it occurs on every island of the archi- 

 pelago. Like the A . fuscatus, it has not yet been observed in 

 the Madeiran group. 



