GASTROPODA 



527 



Fig. 818 Limax maximus (Baker). 1, mantle; 2, 

 respiratory pore ; 3, anterior tentacles ; 4, posterior ten- 

 tacles ; 5, eye ; 6, genital pore. 



mm. or more: an European species present locally in many places in the 

 eastern states. 



L. maximus L. (Fig. 818). Color gray, with alternate longitudinal 

 rows of spots and 



stripes of black, re- - ' 



placed by irregular 

 blotches on the man- 

 tle; dirty white be- 

 low ; body covered 

 with coarse, e 1 o n- 

 gated tubercles; 



length 16 cm. : an European species present locally in many places in the 

 eastern states; California. 



2. AGRIOLIMAX Morch. Body keeled behind and unspotted; jaw 

 with blunt ends : animals live under stones and decaying wood and feed 

 on leaves, etc.; they can suspend themselves by 

 threads of mucous from bushes and trees. 



A. campestris (Binney) (Fig. 819). Color uni- 

 formly grayish or amber, often blackish; upper 

 surface covered with prominent tubercles, not flat- 

 tened ; mantle oval ; mucous watery ; length 25 mm. : 

 common in eastern and central America, under logs, 

 damp leaves, etc. ; California. 



A. agrestis (L.). Upper surface covered with flat, gray, or brown 

 tubercles, separated by darker-colored anastomosing grooves; mantle 

 pore bordered with white ; mucous milky ; length 25 to 50 mm. : eastern 

 America; California; an European species locally present in many 

 places. 



FAMILY 13. ABIONIDAE.* 



Slugs. No external shell, but the small shield-like mantle usually 

 encloses a calcareous rudiment of one; body elongate, limaciform; jaw 

 with prominent ribs; foot with marginal furrows; ureter reflexed: 4 

 genera; about 15 American species, mostly on the Pacific slope. 



1. ARION Ferussac. Body ending obtusely behind; back covered 

 with elongated tuberosities arranged in rows, and not keeled; mantle 

 oval and covered with granulations containing calcareous particles, 

 which represent the shell; mantle pore anterior: 25 species, all in the 

 Old World. 



A. hortensis Fer. Color gray or yellowish or black ; length 5 cm. : an 

 European species, which occurs locally in New England and other places. 



Fig. 819 Agrioli- 

 max campestris (Bin- 

 ney). 1, mantle; 2, 

 posterior tentacles. 



* See "Revision of North American Slugs," by H. A. Pilsbry and E. G. Vanatta, 

 Proc. A cad. Nat. Sci., Phila., 1896, p. 339; also 1898, p. 219. 



