'jG LAND AND FRESH-WATER SHELLS. 



into three longitudinal bands, the middle one being white, the 

 two lateral ones dark. Length 3 to 6 inches. Gardens and 

 fields. Local. L, cinereo-niger. 



Family IIL — Testacellidse. 



Shell small, auriculate, external, placed on the hinder portion 

 of the body, covering the mantle ; respiratory orifice on the right 

 side below the mantle. 



14. Testacella. 



ia) Shell roundish-oval, depressed ; whorls one and a-half, the 

 nucleus making an angle of 45° to the vertical line ; spire short ; 

 suture deepish; mouth roundish, dilated in front. Length \ to fths 

 inch. Animal with two longitudinal furrows on its back, which 

 commence from the shell and terminate near the head. Market 

 gardens and fields. Local. T. haliotidea. 



(b) Shell resembling that of T. haliotidea but smaller in propor- 

 tion to its length, flatter on its superior surface, comparatively 

 longer, more wedge-shaped, brownish, lines of growth finer and 

 less rugged, thinner, and the left side of the shell is more strongly 

 curved. Animal slightly more attenuated in front, and the longi- 

 tudinal farrows near the mantle are much closer together. The 

 nucleus of the shell is placed at an angle of 60° or 70° to the 

 vertical line. The vas deferens enters the penis "terminally 

 in T. scutulum and Maugci : laterally in T. haliotidea.'" Gardens 

 and fields. Local. T. scutulum. 



Fig 30. — A snail-slug {Testacella). 



(c) Shell resembling that of T. haliotidea, but larger and more 

 cyUndrical. Body dark brown. Gardens and fields round 

 Bristol. T. Maugei. 



Family. IV. — Helicidae. 

 Shell spiral. Body distinct from the foot, tentacles four, re- 



