ag ps 
Arion circumscriptus Johnston 
Plate Has 
Animal small, pale creamy-gray, darker dorsally, with a black and 
sharply-defined lateral band extending the whole length of the body on 
each side, Posterior end rounded (when viewed from above), its 
mucous pore conspicuous. The suprapedal groove is indistinct. The 
mantle is granulate, but not concentrically wrinkled, with the breathing 
pore in its anterior half and below the right pigment band. This species 
exudes clear mucous. 
Distribution: Northern and central Europe. Introduced into America; in 
this country there are local records from Maine, Massachusetts, New 
York, Pennsylvania, District of Columbia, Michigan, Indiana, Wisconsin, 
and California, 
This species and the related A, hortensis and A, ater have been widely 
spread by commerce and can cause considerable damage to greenhouses 
and vegetable and flower gardens, 
Arion hortensis Ferussac 
Phateviiy J 
This species is very similar in size and shape to A, circumscriptus, but 
is darker, and the breathing pore is located in the right mantle pigment 
band rather than below it. It also has yellow or orange instead of clear 
mucous, 
Distribution; Iceland, Faroes, Middle Europe, British Isles. Introduced 
locally into Canada, Pennsylvania, Washington, and California. 

Arion ater (Linnaeus) 
Plate isk 
This slug has the same general characters as the two preceding species, 
but is much larger, has a bulkier body, and is without darker pigment 
bands, Adults measure up to 150 mm. when extended. 
Distribution: Central and northern Europe. Introduced locally into 
Canada, Maine, and Michigan, 
