164 



57. Achatina. An oval or oblong univalve ; the opening 

 oblong and entire; the columella smooth. Recent. 

 PL v. fig. 5. 



58. Lymncea. An oblong, subturriculated univalve ; the 

 opening entire and oblong ; the right lip rising within the 

 opening, and forming an oblique fold on the columella. 

 Recent and fossil. PI. v. fig. 6. 



59. Turbo. A conoidal and subturriculated univalve; 

 the opening roundish; the columella smooth; the margin 

 disjoined at the upper part. Recent and fossil. PL v. fig. 7. 



60. Monodonta. An oval or conoidal univalve; the 

 opening roundish and entire ; the columella forming a 

 tooth-like process by its projecting base ; the margin dis- 

 joined at the upper part. Recent. PL v. fig. 8. 



61. Bulimus. An ovate or oblong, and subturriculated 

 univalve; the opening entire, longitudinally oblong, having, 

 in adults, a reflected right lip; the columella smooth, 

 neither truncated nor expanded at its base. Recent and 

 fossil. PL v. fig. 9. 



62. Phasianella. On ovate and thick univalve ; the 

 opening longitudinal, ovate, and entire ; with a sharp plain 

 lip ; the columella smooth and attenuated at its base. Re- 

 cent and rarely fossil. PL v. fig. 10. 



63. Vivipara. An oval or oblong univalve, with a regu- 

 larly elevated and rounded spire ; the opening entire, longi- 

 tudinal, and oblong; the lips united angularly above. 

 Recent and fossil. PL v. fig. 11. 



64. Helix. A globose univalve, with a convex or co- 

 noidal spire ; the opening entire, wider than long, and dimi- 

 nished in its upper part by the projection of the penultimate 

 turn of the spire. Recent and fossil. PL v. fig. 12. 



65. Helicina. A subglobose univalve ; the opening en- 

 tire and semiovate ; the columella callous, with no umbi- 

 licus ; depressed and flattened at the lower part. Recent; 

 one or two fossil species ? PL v. fig. 13. 



