LANfi AND FRESHWATER HOLLUSCA OF DORSETSHIRE. 123 



Society. He notes it as a. Dorsetshire shell, but there is reason 

 to believe he was deceived, and that this species was not of 

 British growth, since, notwithstanding a more diligent search 

 we have been unable to procure it." (Maton and Eackett). 



Genus X. COCHLICOPA, Ferussac. 

 1. COCHLICOPA TRIDENS, Pulteiiey^ pi. 10. 



TURBO TRIDENS, Pult.cat., p. 46, Rack, ed., p. 51, pi. 19, f. 12. 

 Maton and Rackett, Trans. Linn., Soc. vol. viii., 

 p. 181. 

 AZECA TRIDENS, F. and H. iv-, p. 128, pi. cxxv., f. 9. 



A. Mouth furnished with teeth, outer lip sinuous or notched. 



Body greyish slate-colour with a tinge of yellow, closely covered 

 with small black specks, wrinkled. 



Shell elongated, subcylindriral, thin, solid, very glossy, sub- 

 transparent, light yellowish-brown, with a red tinge, faintly 

 marked, extremely fine, unequal longitudinal striae, invisible 

 to the naked eye; periphery rounded, keeled in young specimens; 

 whorls seven, f he lust much larger in proportion; spite rounded at 

 the summit; suture superficial, with a transversely wrinkled border ; 

 mouth narrow, diminishing upwards, angulated below, contracted 

 still further by a tooth, or plate-like fold on the pillar, 

 extending into the interior, there is also a small tooth between it and 

 the outer lip ; a strong fold winds round the pillar lip, aad a tubercle 

 on the middle of the outer lip on its in-ide edge, there are 

 also occasionally two diminutive denticles placed below it; peristome 

 nearly uninterrupted, furnished with a marginal rib in the inside, 

 which is olten reddish-brown or flesh-colour. L.0.25. B.O.I. 



Hab. Among herbage, and damp moss in woods, rare 

 On water plants, by the river Stour (Tulteney.). In his notice 

 of this shell, Montagu says " The species here described we 

 received from Dr. Pulteney ; who has given it in his " Catalogue 

 of Dorsetshire Shells," and says it is found on water plants, by 

 the river Stour in Dorsetshire." 



'' It appears that Dr. Pulteney furnished Montagu with a 

 Dorsetshire specimen of this rare shell ; also that Mr. Boys, as 

 well as Dr. Pulteney, had found it." (Maton and Rackett.) 



