LOCALLY INTRODUCED SPECIES. 465 



Germany, England, and other European countries; also found at Que- 

 bec, probably introduced from England. It is also said byTryon (1. c.) 

 to have been found in Canada, Nova Scotia, and Massachusetts, but I 

 have many doubts of its actually having been found at those points. 



Jaw as described above (Lehmann, I. c). 



Lingual membrane (Terr. Moll., V, Plate IX, Fig. A) with 26-1-26- 

 teeth. The central teeth have decided side cutting points, but not de- 

 cided side cusps. These last are developed on the laterals. The change 

 into marginals is gradual, and is not formed by the splitting of the in- 

 ner cutting point. My figure does not in all respects agree with that 

 of Lehmann, I. c. 



Lehmann, in Mai. Blatt., XVI, p. 197, figures the genital system to 



be as in hispida (q. v.), 



TURRICUJLA, Beck. 



Animal heliciform, mantle subcentral ; other characters as in Patula. 



Shell umbilicated or perforated, conical, often obliquely costulate, 

 banded with chalky white or of a uniform tawny color; whorls 5-10, 

 rather flattened, sometimes turreted, more or less angular or carinated; 

 aperture lunate, narrow ; peristome straight, its extremities thickened 

 within. 



Jaw described with from 8 to 10 ribs. That of several French spe- 

 cies is figured by Moquin-Tandon. T. terres- fio. 507. 

 Iris has over 18 broad, flat, crowded ribs, 

 slightly denticulating either margin; the jaw 

 is low, wide, slightly arcuate, ends but little 

 acuminated, blunt. 



Lingual membrane (of T. terrestris, from ja^ of T.terresti is. 



Charleston, S. C.) with 20-1-20 teeth, the ninth tooth having its inner 

 cutting point bifid, centrals tricuspid, laterals bicuspid, marginals low, 

 wide, with one inner, long, oblique, bluntly bifid cutting point, and one 

 outer, smaller, sharply bifid (see Plate XY, Fig. M, of Terr. Moll., V). 



A genus of the circa-Mediterranean fauna, one species of which, T. 

 terrestris, has been introduced by commerce within our limits. 



Turricula feri-estris, Chemnitz. 



Shell umbilicated, conic-roof shaped, white, above with delicate 

 striae, and hardly unifasciate, flattened below : whorls 6, flat, 



' '^ ' 7 ? ? Fig. 508. 



somewhat turreted, narrowly carinated ; umbilicus very nar- 

 row, pervious ; aperture ax-shaped ; peristome straight, 

 acute, within thickened with white. Greater diameter 10, j, fg„estris 

 lesser O'"'^; height, 6^°^°^. enlarged." 



1749— Bull. 28 30 



