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 Avion was separated from 

 Limax by M. F^russac, 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 bemg deposited in 

 its place ; the respiratory foramen also is situated at the 

 anterior in place of the posterior margin of the mantle. 

 These differences, with then- 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, FilRUSSAO 

 Plate LXIV. Figure 1. Plate LXV. Figube 2. 



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

 confertis elongatis striate ; clypeo ovali, granuloso ; cauda 

 obtusa, absque carina ; apertura communi antica ; margine 

 fascia fusca obscure ornafo. 



SYNONYMS AND REFERENCES. 



Arion hortemis. Fer. Hist, p. 65, pi. 2, f. 6, Sup. p. 96, a 

 Lamarck, 2d edit. p. 719. 

 Bouchard-Chanteeeaux, Ioc. fit. p. 24. 

 BiNNEY, Liinacidae, p. 10. 



DESCRIPTION. 



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



