Binney on Terrestrial Mollusks. 183 



fente ombilicale. Spire acuminoe, aigue. Cinq tours un peu con- 

 vexes, dont le dernier siirpasse le tiers de la longueur totale. Ouver. 

 ture peu oblique, ol)longue ; parol aperturale munie, vers le milieu, 

 d'une seulc dcnticulation assez forte. Peristome legerement borde 

 et assez refk'clii. Uord extC^ricur inflechi en dedans. 



Long. If de mill. ; diam. f mill. 



Habite les Etats-Unis d'Ameritpic. 



Le Cari/c/n'iim euphceum \)mi etre rapproche des CarycMum ex- 

 istelinm et exigmim. 



1°. On le distinguera de Vexistelhim a sa taille plus faible, a sa 

 spire plus aigue, a son ouverture proportionellement plus dilatee, a 

 sa parol aperturale ornee, vers son milieu, d'une petite denticula- 

 tion ; a son peristome plus reflechi et plus epaissi, etc. ; enfin a ses 

 cinq tours de spire, etc. etc. 



2°. On le separera de Yexiguum a sa taille egalement plus faible, 

 a son ouverture munie seulement d'une seule denticulation, tandis 

 que celle de Yexiguum en possede deux, a son peristome plus epaissi, 

 plus reflechi, a sa spire plus aigue,. etc. etc. 



Spurious Species. 

 CarycMum armigera, contractu, and rupicola of Say (1. c.) are now 

 ascertained to be true Pupce, as he suggested they might be ; as 

 is also Caryckium corticaria Ferussac, (Tabl. Syst.) 



PNE UMONOP OMA. 



The above named order includes all the following fami- 

 lies. The animals which compose it are distinguished 

 from those of the preceding families of Limacea, Helicea, 

 and Auriculacea, by the presence of an operculum, which 

 is affixed to the foot and covers the aperture of the shell 

 when they are withdrawn in it. They are terrestrial, 

 breathing air by means of organs analogous to lungs. 

 They are also unisexual, and have but two contractile 

 instead of retractile tentacles, at the base of which are 

 situated two eyes. The mantle is sometimes, though not 

 always, free. 



