192 TERRESTRIAL AIR-BREATHING MOLLUSKS. 



the peristome of the shell ; generative orifice behind the right eye-peduncle ; 



no locomotive disk ; no caudal mucus pore. 



Pig 98^ Shell obsoletely rimate, calcareous, nor- 



mally truncated, cylindrically elongate ; re- 

 maining whorls 4-6, the upper truncated 

 ones 8-10, the upper one globular; aperture 

 semioval ; peristome straight, thickened with- 



Aniva&l of Stenogyra decoUata. . . . i • i n i 



in, its margins connected with callus, the 

 columellar twice as short as the external one ; columella not truncated. 



Jaw and lingual membrane: see p. 191. 



A single species is known, which inhabits Europe. It has been introduced 

 by commerce into Charleston, South Carolina. 



Stenogyra decollata, Linn. 

 Vol. III. n. I. Fig. 1. 



Shell rather thick, long, cylindrical, turreted ; epidermis shining, whitish, 

 with a slight tint of brownish or yellowish ; apex obtuse ; spire gradually en- 

 larging from the apex to tlie aperture, commonly abruptly truncated between 

 the third and fifth whorls next the aperture ; whorls remaining 3 to 5, flat, a 

 little wrinkled, and in the last two or three slightly crenate, or plaited below 

 the suture ; suture not impressed ; aperture lateral, oval, angulated superiorly, 

 its plane very nearly parallel with the axis of the shell ; peristome simple, 

 thickened within, its columellar portion reflected. Axis of the truncated shell 

 usually about 25 mill. ; diameter of the largest whorl less than 12 mill. 



Helix decollata, Linnjeus, Syst. Nat. 1247, etc, 



Bulimus decollatus, Draparnaud, 76, PI. IV. Fig. 27, etc. — Pfeiffer, Mon. 



Hel. Viv., IV. 456.— BiNNEY, Terr. Moll., II. 280, PI. I. Fig. 1.— W. G. 



BiNNEY, Terr. Moll., IV. 131. — Leidy, T. M. U. S., I. 259, PI. XV. Figs. 5, 



6 (1851), anat. 

 Bulimus mitUilatus, Say, Jouru. Acad. Nat. Sci. Philad., II. 373; ed. Binney, 



25 (err. typ. for mutilatus). 

 Bulimus mutilaius, DeKay, N. V. Moll., 56 (1843). — Pfeiffer, Mon. Hel. 



Viv., II. 153; III. 397. — Reeve, Con. Icon., Fig. 331. 

 Rumina decollata, Tryon, Am. Journ. Conch., III. 300 (1868). 

 Stenogyra decollata, W. G. Binney, L. & Fr.-W. Sh., I. 228 (1869). 



An European species, introduced at Charleston, South Carolina, where it has 

 increased very rapidly, and has retained its position for more than fifty years. 

 It has also been introduced in Cuba and Brazil. 



Animal (see Fig. 98) : body short, extending but little behind the aperture, 

 blackish or bluish-black on the head and back, with decidedly green reflections 

 in certain lights, the sides and posterior extremity olivaceous; surface finely 

 granulated ; eye-peduncles slender and rather short ; ocular points very small ; 

 tentacles very short. The shell is carried nearly horizontally when in motion. 



