95. Shell slightly spiral 96. 

 Shell a flattened or convex plate; northwestern states — Plated Slugs 97. 



96. Mantle on the rear of the animal, covered by a tiny shell; an introduced 



species often found in greenhouses 



Testacella haliotoidea Draparnaud 

 (Testacella europaea de Roissy) 

 Mantle more central, partly covered by a small shell; on islands off the 

 coast of California 



Binneya notahilis Cooper 



97. Mantle covered with papillae; posterior part of body with a median 



ridge ending in a curved-down projection 



Hemphillia glandulosa B. 6? B. 

 Mantle slightly wrinkled; posterior half of body somewhat keeled, but 

 without any terminal projection 



Hemphillia camelus P. &? V. 



98. Mantle covering almost or all of the back 99, 

 Mantle anterior in position 101. 



99. Respiratory pore on the right side, posterior, and below the margin of 



the mantle; Florida 



Veronicella flondana (Leidy) 

 Respiratory pore on the right side, anterior, and slightly above the mar- 

 gin of the mantle; in the eastern and central states 100. 



100. Mantle covering the entire back; animal yellowish, with dark blotches 



which may form three indefinite lengthwise rows; about 3" or 4" 

 long; west to Iowa and Texas 



Philomycus carolinianus (Bosc) 

 {Tebennophorus carolinensis (Bosc) ) 

 Mantle covering all but a small head region; animal grayish, sometimes 

 with a broken dark band down the center of the back; about Y/' 

 long; northeastern and north'central states 

 Palhfera dorsalis (Binney) 

 (Tebennophorus dorsalis (Binney) ) 



101. Respiratory pore on the right side and placed centrally or anterior to 



the middle of the mantle 102. 



Respiratory pore placed posterior to the middle of the right side of the 



mantle 109. 



102. Skin coarsely wrinkled lengthwise and often with lengthwise tubercles; 



genital pore below the respiratory pore; introduced European species 



103. 



Skin with a network enclosing diamond-shaped patches or with more 



oblique wrinkles on the sides; genital pore below or behind the right 



tentacle; western species 105. 



103. Back uniformly colored; 21/2" lo^ig 



Arion ater (Linn.) 

 Back usually striped; smaller 104. 



104. Dark stripe on right side of mantle passing through the respiratory pore 



Arion hortensis Per. Gray European Slug 

 (Anon fuscus (Miillcr) ) 



125 



