SUCCINEA. 



255 



Vertigo penioclon, Say, is the same as Pupa pentodon. 

 Vertigo rupicola, Binney, is tlie same as Pujia rupicola. 

 Vertigo corticaria, Binney, is the same as Pupa corticaria. 



Subfamily SUCCININ^. 



Jaw arcuate, at the convex edge lengthened into an addi- 

 tional nearly square plate, at its concave edge striated or 

 ridged, with a short middle projection. 



Lingual teeth in long, curving, transverse rows, centra^'=^ 

 tricuspid, laterals bicuspid, uncini serrated. 



SUCCINEA,' Dk. 



Shell imperforate, thin, ovate or oblong ; aperture large, 

 obliquely oval ; columella simple, acute ; peristome simple, 

 straight. 



Jaw with a subquatlrate plate attached to 

 its convex margin ; strongly arcuate, ends 

 pointed ; anterior surface smooth, or ridged ; 

 concave margin simple, with a rostriform 

 median projection. 



Lingual membrane with curving transverse 

 series of teeth ; centrals tricuspid ; laterals 

 bicuspid ; uncini serrate. 



Fig. 451. 



Fijr. 450. 



Jaw of Succinea avara, 

 [Morse.] 



Lingual dentition of Sueeinea avara. 



SoBGEXDS SUCGINEA, Dr., s. str. 

 Shell oblong, spire produced, whirls 3-4, convex, the last 

 large, rounded, aperture oval. 



' To follow strictly the law of priority, Neritostortia, Klein, sliould be 

 used for this genus. 



