76 



CONCHOLOGY. 



t.mvalves. sub-carinated ; mouth subovate; length half an inch; 

 ^T^""' breadth a quarter. 



Lift. Trans, vol. viii. tab. 4. fig. 14. 

 Found by Lady Wilson near Sunderland, in the 

 county of Durham. 

 Scrnistria. g 3- Semistriatus. Shell thick, conic, white, with six 

 tu< ' rounded spires ; base of the shell, as far as the upper 



angle of the mouth, finely striated spirally; the same is 

 observable on the upper and lower parts of the other 

 volutions ; mouth angulated at the interior end ; pillar 

 lip thickened on the columella; length one eighth of an 

 inch. 



Test. Brit. Sup. p. 136. 

 Found by Mr Montagu on the coast of South Devon. 



xrv. 



Gdosto- 



MIA. 



Genus XIV. Odostomia. 



Shell spiral, produced, mouth contracted, subangular, 

 generally distinct from the body whorl, and furnished 

 with teeth. 



Obs. The shells which we have formed into the pre- 

 sent genus were included by Linnaeus in the turreted 

 division of his genus turbo. They were thus associated 

 with species to which they bear no affinity in habit, and 

 from which they differ in character. By far the greater 

 number inhabit the land, and are found under stones, 

 on rocks, and among moss. The genus admits of a two- 

 fold sub-division. 



A. Spires dextral. 



Muscorum, 1. Muscorum. Shell smooth, glossy, horn-coloured, 

 sub-cylindric, with six spires; apex obtuse; mouth sub- 

 orbicular marginated; the margin white, a little re- 

 flected; pillar lip, furnished with a single tooth; 

 length about the eighth of an inch. 



Test. Brit. tab. 22. fig. 3. T. muscorum. 

 A very common species at the roots of trees and under 

 stones. 

 -isexdentata, 2. Sexdentttta. Shell smooth, brown, horn-coloured, 

 with five spires, somewhat rounded ; aperture sub-or- 

 bicular; outer lip uneven, sub-angulated, usually fur- 

 nished with six teeth, four on the outer lip and two on 

 the inner ; length a line. 



Test. Brit. tab. 12. fig. 8. 

 In marshes in England on the Iris pseudacorus. 

 Tridens, 3. Tridens. Shell sub-cylindrical, smooth, glossy, 



of a light brown colour; volutions seven; scarcely 

 raised ; apex obtuse ; mouth small and curved ; outer 

 lip furnished with one tooth on the margin ; pillar lip 

 a little reflected, with two long and two short teeth alter- 

 nately ; length a quarter of an inch. 



Mem. Wernerian Soc. vol. i. tab. 8. fig. 11. 

 In England rare. Mr Laskey found it in Caroline 

 park near Edinburgh, 

 Caryckium, 4. Carychium. Shell glossy, pellucid, white, with 

 five longitudinally striated whorls, rounded, and well 

 defined by the separating line; mouth suboval, con- 

 tracted, marginated ; outer lip thickened inwards by a 

 knob ; pillar lip furnished with two teeth, and some- 

 times the rudiments of a third above the other two ; 

 length about a line. 



Test. Brit. tab. 22. fig. 2. 

 Common in woods and mossy banks in England and 

 Scotland. 

 Jimiperi, 5. Juniperi. Shell sub-cylindric, opake, brown, with 



nine spires striated longitudinally oblique; the four first 

 volutions are cylindrical, the rest taper to an obtuse 

 apex; mouth sub-orbicular, marginated, reflected, white, 

 with three teeth on the outer lip, and four on the co- 



lumella ; a cavity behind the pillar lip; length upwards Univalvw. 

 of a quarter of an inch. w "Y" w ' 



Test. Brit. tab. 12. fig. 12. 

 Found by Mr Montague and Mr Bryer in England. 

 Mr Laskey has found it at Dunbar. It inhabits the 

 roots of juniper bushes. 



6. Interstincta. Shell glossy, white, taper, with five Interstinc 

 rather flat, but finely ribbed volutions ; mouth suboval; ta, 

 pillar lip a little reflected, with a single small tooth ; 



length about a line. 



Test. Brit. tab. 12. fig. 10. 

 A rare shell ; found by Mr Montagu in sand from 

 Bigberry-bay in Devonshire. 



7. Unidentata. Shell strong, conic, smooth, glossy, Uuidenta- 

 subpellucid, volutions six, not much raised ; aperture ta, 

 sub-oval ; outer lip plain ; columella furnished near the 

 middle with one tooth ; length two-tenths of an inch. 



Test. Brit. p. 324. 

 Found in Salcomb bay adhering to the Pecten maxi- 

 mus. 



8. Plicata. Shell smooth, glossy, subpellucid, white, Phcata, 

 with six rather slender spires, terminating in an obtuse 



apex ; volutions nearly flat ; aperture contracted a 

 little to an angle on the upper part ; outer lip even ; 

 inner lip furnished with a single toothlike fold. 

 Test. Brit. tab. 21. fig. 2. 

 Found in sand from Salcomb bay by Mr Montagu. 



9. Sandvicensis. Shell pellucid, white, spires three, Smdvken- 

 elegantly reticulated ; aperture oval; one tooth. si*, 



Test. Min. Rar. tab. 2. fig. 55. 

 From Sandwich. Mr Walker. 



10. Insculpta. Shell pellucid, white and taper, with Insculpta, 

 five or six moderately convex whorls, striated spirally ; 



apex obtusely pointed ; aperture subovate ; pillar Up, 

 with a faint duplicative forming a sub-umbilicus, and 

 furnished with a small tooth ; length one-eighth of an 

 inch. 



Test. Brit. Sup. p. 129- 

 A rare shell, found on the coast of Devon by Mr 

 Montagu. 



B. Spires Sinistral. 



11. Perversa. Shell with eight or nine regular ta- Perversi5> 

 pering spires, obsoletely striated; volutions a little round- 

 ed and divided by a deep separating line ; mouth sub- 

 orbicular ; outer lip a little reflected ; pillar lip not de- 

 tached, edges white, thin, at the upper angle a tooth- 

 like knob ; length nearly a quarter of an inch. 



Test. Brit. tab. 11. fig. 12. 

 Animal dusky above, light beneath ; tentacula four, 

 short, cylindric, clavate, furnished with eyes at the tips 

 of the longest. Found on rocks, trees, and moss, in 

 England and Scotland common. 



12. Nigricans. Shell taper, swelling a little in the Nigricans, 

 middle, and marked with fine longitudinal striae; volu- 

 tions rather flat, but well defined and twelve in num- 

 ber ; mouth compressed on the outer angle near to the 



body; pillar lip furnished with two teeth, and per- 

 fectly detached from the body whorl; at the back of the 

 lower volution, behind the mouth, is a prominent ridge 

 and a depression. 



Test. Brit. tab. 11. fig. 7-— Turbo-bidens. 



Animal dusky ; tentacula four, short, cylindric, cla- 

 vate ; the two longest furnished with eyes at their tips. 

 A very common shell on rocks, trees, and moss m both 

 kingdoms. , 



13. Laminakt. Shell smooth, glossy, pellucid, with Laminata,, 

 ten spires ; thickest in the middle, tapering from thence 

 to a small round point; volutions a little raised; mouth 



