ARIOLIMAX. 



219 



central teeth large, with a long median cusp, side cusp obsolete ; 

 lateral teeth and uneiui bicuspid, the inner cusp longer and moie 



Fig. 498. 



Lingual membiaae of Ariolimax columbiuiiics. 



slender than the outer, and becoming proportionally still more 

 slender and lengthened as the teeth are modified in passing oif 

 laterally. 



This genus is founded on the large species inhabiting the 

 Pacific States, known as Limax columbianus. It is readily 

 distinguished from Avion by its internal shelly plate, and the 

 position of the respiratory orifice ; from Limax by its dentate 

 jaw. The only species of Geomalacus yet known has an 

 internal plate, but its respiratory orifice is much more anterior, 



Ariolimax collisnbianus, Gould. — Color a dark, dirty, green- 

 ish-yfUow, either uniform or in some varieties olouded with large pnri'lish- 

 black, irregular blotches. The body is large and corpulent, the anterior 

 portion elevated, with the back rounded, and the posteiior portion strongly 

 carinated; at the posterior tip there is apparently a tuucus pore. The 

 margia of the foot extends beyond the mantle and forms a ruffl* around 



Fig. 499. 



Ariolimax columbinnxis, reduced one-half. 



the animal, with transversely oblique markings. The surface is tessellated 

 with coar.se elongated papillae arranged longitudinally. The cuirass is 

 broad, truncated in front, minutely granulated, with the respiratory orifice 

 at the posterior third. Face vertically wrinkled ; eye-peduncles rather 

 short, thickened at base, colored like the body and finely granulated; 

 tentacles long and slender. Length SA inches. 



