170 Binney on the Naked Air-Breathing Mollusca 



Its testaceous rudiment is minute and delicate in proportion 

 to the small size of the animal. 



Genus Arion, Ferussac. 



ARION HORTENSIS. 



L. corpore albido, aut griseo, glandulis confertis, elongatis striato ; clypeo 

 anteriore, ovali, granuloso ; cauda obtusa, carina nulla ; aperturci lateral! posti- 

 ck ; margine fascia fusca obscure ornata. 



SYNONYMES AND REFERENCES. 



Arion hortensis, ferussac. Tah. Syst. p. 18. 



Hist, des Moll, p. 66, pi. 2,f. 6. 



Supplement, p. 06, a. 

 BOUCHARD-CHANTEREAUX. Catalogue, p. 24. 

 Limax hortensis, lamarck. Anim. sans Vert. Yl. p. 919. 



DESCRIPTION. 



Color of upper surface whitish or light ashy, sometimes 

 with a slight tinge of brown ; an obscure, ill-defined brownish 

 line extending along the lower margin of the mantle, and of 

 the body on both sides, meeting over the posterior extremity. 

 Body when extended cylindrical, narrow, very much elonga- 

 ted, expanding a little towards its posterior extremity, termi- 

 nating in a truncated point ; the upper surface crowded with 

 fine, oblong tuberosities, its flanks with elongated tuberculated 

 plates, with furrows between. Mantle small, oval, rather 

 narrow, flattened, its anterior margin nearly reaching the 

 head ; its surface covered with minute granulations ; about 

 one-fourth of the length of the body. Between the superior 

 tentacles a tubercular ridge with furrows on each side. Su- 

 perior tentacles darker than the general surface ; about one- 

 eighth of the length of the body, stout, cylindrical, with black 

 oculiferous points ; lower tentacles beneath the upper, very 

 short. Foot whitish, separated from the margin of the body 

 by a furrow, and projecting beyond the body posteriorly, with 

 a flat and rounded termination ; locomotive band not distin- 

 guished from the foot. At the posterior termination of the 

 body is the triangular sinus, or mucus pore. Respiratory 

 foramen very small, situated near the margin of the mantle, 



