CLASS IV 



GASTROPODA 



577 



Family 4. Achatinidae Pilslny. 



Ovate or elonfiate, imperforate shells, with the coluraella (jeneralhj truncated at the 

 base. Upper Cretaceous to Recent. 



Achatina Lam. Recent ; tropical Africa. 



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

 Adams. These are all small members of the group, mainly Recent. 



Megaspira Lea (Fig. 1091). Turreted, slender, very long ; 

 columella with transverse folds. Upper Cretaceous to Recent. 



Gochlicopa Fer. ; Azeca Leach ; Gaecilianella Bourg., etc. 

 Tertiary and Recent. 



Fid 1091 



Superfamily 2. AGNATHA Morch. ,,^^,^.p.,.^ ^^^^,^„,^ 



(Micli.). Lower 



Carnivorous snails, usually vdth no jaw, thorn-shaped teeth, and Eocene; Riily, near 

 without furroivs above the foot edges. 



Fig. 1092. 



Tcstacella zcllu Klein. 

 Miocene ; Andelflngen 

 (after Sandberger). 



Fanuly 1. Testacellidae Gray. 



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

 vermiform animal. Tertiary and Recent. 



Testacella Cuvier (Fig. 1092). Shell auri- 

 form, borne on the posterior end of the animal. 

 Tertiary and Recent. jfP^\\\\\\ 



Parmacellina Sandberger. Eocene. Daude- 

 bardia Hartm. {Helicophanta Fer. p.p.). 

 Quaternary and Recent. 



Family 2. Glandinidae Albers. 



Shell oval or oblong, capable of containing the entire animal' 

 Cretaceous to Recent. 



Glandiiia 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 

 American tropics. 



Glandina inflata 

 Reuss. Miocene; 

 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 imcoiled, 

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

 margin loide ; jaio 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 ifefe-shaped snails from the Coal Measures of Nova 

 Scotia. 



VOL. I -" ^ 



