ci'Ass IV GASTROPODA 577 



Family 4. Achatinidae Pilsbry. 



Ovate or elongate, imperforate shells, luüh the coluraella generally truncated at the 

 hase. Upper Cretaceoiis to Receiit. 



Achatina Lam. Recent ; tropical Africa. 



Stenofjyra Sliuttlew. ; Rumina Risso ; Opeas Alb.; Rhodea 

 Adams. These are all small menibers of tlie group, mainly Recent. 



Megaspira Lea (Fig. 1091). Tiirreted, sleiider, very long; 

 columella witli transverse folds. Upper Cretaceoiis to Recent. 



Gochlicopa Fer. ; Äzeca Leacli ; Gaecilianella Boiirg., etc. 

 Tertiary and Recent. 



Superfamily 2. AGNATHA Mörch. „ ^'"' ^^^^- 



Megaspira exarata 



Garnivorous snails, usually with no jaiv, thorn-shaped teeth, and Eocene; Riiiy°nelr 

 without furrows above the f 00t 



Fig. 1093. 



Rheims. 



Family 1. Testacellidae Gray. 



Shell Spiral, of very small size, and situated near the tail of the 

 ^ vermiform animal. Tertiary and Recent. 



!^M Testacella Cuvier (Fig. 1092). Shell auri- 



^^ form, borne on the posterior end of the animal. 



Fig. 1092 Tertiary and Recent. 



Testacella zelUi Klein. ParmacelUna Sandberger. Eocene. Daude- 



Miocene ; Andeifingen bardia Hartm. (Helicophanta Fer. xy.vX 



(after Sandberger). <^ , i -r. , i i y 



Quaternary and Recent. 



Family 2. Glandinidae Albers. 



Shell oval or oblong^ capable of containing the entire animal. 

 Cretaceoiis to Recent. 



Glandina Schum. (Fig. 1093). Shell elongate-oval, with high 

 spire. Aperture notched in front ; columella truncated. Upper 

 Cretaceous to Recent. Other Recent allied genera inhabit the Reitl^'''uuZine'\ 



American tropics. Richelberg, near Ulm.' 



Superfamily 3. AULACOPODA Pilsbry. 



Foot with longitudinal grooves above and parallel with its lateral margins. 



Family 1. Zonitidae Pfeiffer. 



Aulacopoda with a spiral, conical or helicoid shell, sometimes partially uncoiledj 

 usually smooth and loith simple lip ; marginal teeth of the radula thorn-like ; foot 

 margin wide ; jaiv rather smooth. Carboniferous (?) to Recent. 



Vitrina Drap. Shell small, translucent, with short spire, and very large body 

 whorl. Tertiary and Recent. 



Archaeozonites Sandb. (Fig. 1094). Thick-shelled, globose, with rather high spire, 

 deeply umbilicate ; outer margin sharp. Oligocene and Miocene. Here also should 

 be placed, perhaps, the archaic üTßZiic-shaped snails from the Goal Measures of Nova 

 Scotia. 



VOL. I 2 V 



