482 YAGINULIDJE. 



narrow and linear when extended, acuminate posteriorly, some- 

 times rounded. 



Mantle covering the whole of the upper part of the body, 

 separated from the sides by a lateral margin, smooth and united in 

 the extended state, without internal shell or calcareous particles. 



Foot consisting of numerous, crowded, narrow, well-marked 

 rings ; separated from the sides by a deep furrow and projecting 

 on either side, covering the furrow with a thin edge, sometimes 

 projecting beyond the mantle posteriorly, where it is flat, 

 acuminate or rounded, free and distinct from the side. 



Head distinct, consisting of a buccal mass, provided with an 

 internal jaw and terminal papilla, disposed in a circle as in 

 Limaces, consequently without lips or buccal tentacles ; it can be 

 withdrawn under the mantle, which, together with the sides 

 and the anterior portion of the foot, forms a kind of case for its 

 reception. 



Tentacles four, unequal, contractile ; the upper pair long, cylin- 

 drical, blunt, bearing the eyes at the apex, the lower pair short, 

 slightly lateral, and subpalmate or subdigitate at the extremity. 



Pulmonary cavity situate anteriorly on the right side at about 

 two-fifths of the total length, communicating with the outer air 

 by a lateral duct which opens out at the posterior part of the 

 body, between the mantle and the free portion of the foot, in a 

 kind of pocket, where the anal duct, placed below the respiratory 

 duct and separated from it by a membrane, also has its outlet. 



Generative organs distinct and separate. 



Orifice of male organ near and below the lower right tentacle. 



Female orifice below the mantle on the right side, near the foot, 

 towards the middle of the body. 



No terminal mucous pore. 



472. Vaginulus alte, Fermsac. 



Vaginulus alte, Fe"russac, Tabl. Syst. Fam. Limaces, 1821, p. 14 ; 



ibid., Hist. Nat. Moll, ii, part 1, 1823, p. 96 *, pi. 8 A, fig. 8, 



pi. SB, fig. 6. 

 Vaginula alte, Fischer, Nouv. Arch. Mus. Hist. Nat. vii, 1871, 



p. 157. 

 Veronicella alte, Cockerell, The Conchologist, ii, 1893, p. 193. 



Original description: "La forme generale de cette espece se 

 rapproche tellement de celle de Fonchidie du Typha de Buchanan, 

 que nous crumes au premier coup d'reil que c'etoit elle : vivant 

 dans les memes contrees, cette circonstance rendoit notre sup- 

 position assez probable ; mais Pexamen que nous en avons fait, 

 en nous montrant quatre tentacules et une organisation ex- 

 terieure semblable a celle des especes precedentes, nous tira de 

 notre erreur. II faudroit supposer, chez le docteur Buchanan, 

 une meprise singuliere, qui ne peut se presumer, malgre toute 

 1'analogie exterieure de ces deux limaces. Selon Mr. Leschenault, 

 la vaginule alte est ainsi nominee, parce qu'elle ressemble a une 



