ABIDA. 271 



and the suture (pi. 44, fig. 3). The parietal lamella is deep 

 within, low in front but high within. A slender lamella 

 stands close to the columellar insertion. Columellar lamella 

 strong within, emerging and ascending obliquely to the peri- 

 stome. Subcolumellar lamella smaller, descending and emerg- 

 ing. Upper and lower palatal and basal plica? strong, emerg- 

 ing, becoming lower within, and again enlarging to form an 

 inner barrier in a dorso-lateral position, where there is also a 

 short suprapalatal and a smaller sutural plica. The peristome 

 is somewhat expanded, whitish, its internal callous sculptured 

 with few or (typically) many narrow folds. 



Length 8, diam. 2.8 mm. (typical form, fig. 2). 



Length 9.8, diam. 2.8 mm. (long form, fig. I). 



France: in the olive zone, east to the Var valley, north to 

 Grenoble in the Isere valley, but on the west side of the Rhone 

 not beyond the Ardeche river; west to the Pyrenees. Type 

 locality, Castelnau, near Montpellier. 



Spain : Pyrenees, and in the Mediterranean drainage south- 

 west to the province of Murcia ; Minorca. 



Pupa polyodcm DBAPABNAUD, Tableau, 1801, p. 60; Hist. 

 Moll. France, p. 67, pi. 4, f. 1, 2. ROSSMAESSLER, Iconogr., i, 

 pt. 5, p. 12, f. 316. KUESTER, Conchyl. Cab., Pupa, p. 42, pi. 

 5, f . 24, 25. PFEIFFER, Monogr., ii, 336. MOQUIN-TANDON, 

 Hist. nat. Moll. Fr., p. 372, pi. 26, f . 39 ; pi. 27, f . 1-4, with 

 var. attrita, p. 373. BOURGUIGNAT, Malac. de 1'Algerie, ii, p. 

 77, pi. 5, f. 14-18 (flood debris of the ravine Chabat-Beinan, 

 near Cape Caxine, Algeria). CAZIOT et FAGOT, Ann. Soc. 

 Linn. Lyon, n. ser. liii, 1907, p. 192. CAZIOT, Etude Moll. 

 Monaco, etc., 1910, p. 321 ; Bull. Soc. Zool. France, xxxv, 1910, 

 pp. 94-98. Chondrus polyodon CUVIER, Regne Animal, ii, p. 

 408. Granaria polyodon HELD., Isis, 1837, p. 918. Pupa 

 montserratica FAGOT, Annales de Malacologie, ii, 1884, p. 191. 



Abida polyodon is readily known by the many denticula- 

 tions of the peristome, which are strongest in the Pyrenean 

 race ringicula, and sometimes weak and partly wanting in 

 French examples. At all times the internal structure is char- 

 acteristic, the spiral lamella being continuous with the an- 

 gular, and penetrating beyond the parietal lamella, and a small 



