122 THE LANb AND F*ESiiWATER MOLLUSCA OF DORSETSHIRE. 



sometimes bifurcate far witliin the neck of the shell, where there is 

 another strong tooth on the pillar lip, and one still farther in, 

 occasionally one or two teeth within the outer-lip, which is thick, 

 white, and reflected; umbilicus a slight cleft: clattsilium oval-oblong, 

 obtuse below, slightly dilated above, thin, thickened at the margin 

 which is entire. L.U.o. 13.0.1. 



Hab. On walls and rocks, under stones and trunks of trees. 

 Generally distributed. 



2. c. LAMINATA, Montagu, pi. 10. 



TURBO PERVERSUS, Pult. cat., p. 46 (in part). 



TURBO LAMIXATUS, Rack, ed., p. 51, pi. 19, f. 9, Mont. Test. Brit., 

 p. 359, pi. 11, f. 4. 



Body slisrhtly attenuated and truncate in front, slightly pointed 

 behind, reddish-black or greyish-brown above, light-grey on the sides 

 and underneath. 



Shell fusiform, slightly ventricose towards the centre, solid, glossy, 

 semi-transparent, dark-yellowish horn-colour, with a reddish tinge, 

 longitudinal stride very delicately fine, invisible to the naked eye, a 

 few coarse wrinkles n.ear the month ; iihorls twelve, compressed, the 

 first two or three similar in diameter and breadth ; spire tapering 

 obtuse at the point ; mouth rounded, ililared below, not anguldted 

 above a.s is thy case with C. ru&osa ; upper tooth projecting, long and 

 nearly straight; lower one slightly separated from the upper, very 

 thin, no interhiminary plaits; there aie three or four palatal folds, 

 which are visible from the outside, o^ing lothe transparency of the 

 shell ; outer lip white and expanded ; umbilicus very small ; clau- 

 silium quadrate-oblong, obliquely and deeply notched towards 

 the base, white. L.0.7. B.0.15. 



Hab. On the trunks and roots or trees, especially on the 

 beach and ash, woods and bushy clilFs ; on an ash tree, Grange 

 Wood ; bushy places on the summit or Old Harry, Studland 



(J.C.M.P.;. 



SPURIOUS. 

 CLAUSILIA BIDENS, Linn. 



TURBO BIDENS, Pult. cat., p. 46, Maton. Rack., Tram. Linn., 

 vol. viii., p. 176, pi. 5, f. 3. 



Figured in the Linnean transactions as a Dorset species, but 

 doubtless erroneous. " We have given a figure from a specimen 

 in Doctor Pulteney's Museum, now in the possession of the 



