ARION. 27 



GEOGRAPHICAL DISTRIBUTION. Has been noticed 

 hitherto only in gardens in the city of Boston, and at 

 road-sides in its vicinity. 



REMARKS. The genus Arion was separated from 

 Limax by M. Ferussac, to contain those species of the 

 latter genus having a terminal pore or sinus. Besides 

 this distinction, the mantle of the Arion contains no rudi- 

 mentary shell, a few calcareous grains being deposited in 

 its place ; the respiratory foramen also is situated at the 

 anterior in place of the posterior margin of the mantle. 

 These diiferences, with their anatomical peculiarities, 

 seemed to him to furnish sufficient reason for the separa- 

 tion. His example has been generally followed, though 

 there are some who, like M. Deshayes, deny the pro- 

 priety or expediency of the change. 



1. ARION HORTENSIS, FERUSSAC. 

 PLATE LXTV. FIGURE 1. PLATE LXV. FIGURE 2. 



A. corpore albido, aut griseo, aut rufescente, glandulis 

 confertis elongatis striato ; clypeo ovali, granuloso ; cauda 

 obtusa, absque carina ; apertura communi antica ; margine 

 fascia fusca obscure ornato. 



SYNONYMS AND REFERENCES. 



Arion ftartensis. FER. Hist. p. 65, pi. 2, f. 6. Sup. p. 96, a. 

 LAMARCK, 2d edit. p. 719. 

 BOUCHARD- CHANTEREAUX, loc. cit. p. 24. 

 BINNEY, Lirnacidae, p. 10. 



DESCRIPTION. 



Color, whitish, or light ashy, sometimes with a tint of 



