427 



traftile tentacula, and had by accident fallen into that 

 element ; but we never before or fince, found one fo large, 

 fo extremely thin and pellucid, or of fo light a colour. 

 The animal of this is dufky above ; tentacula four, of 

 the fame colour, cylindric, a little clavate at the end, 

 the longefl furnifhed with eyes at their tips. 



Trochus terreflrls, Lifteri. Da Cojiap. 35. Trochiformi 



Lifter Angi: p. 123, -jab. 1 1. f. 9. 



Phil. Tratis. No. 105. f. 9 ? 



Helix Trochulus. Mulkr Verm. p. 79. No. 276. 



H. with a thin, pellucid, horn-coloured (hell, fome- 

 times inclining to rufous ; with fix rounded volutions, 

 nearly fmOoth, and gloffy, flrongly divided by thefepa- 

 rating line: afex confiderably produced: bafe a little 

 rounded: aperture fub-lunated, tranfverfely comprefled ; 

 lip attenuated, in old (hells a little re(le6led at the lower 

 angle, forming 3.fub-umbilicus, fcarce diftinguilhable in 

 young fpecimens, though mod times a little concave in 

 the centre of the bafe. Length about one-eighth of an 

 inch ; breadth nearly the fame. 



This fpecies has much the habit of a Trochus, but the 

 lunated mouth forbids its being placed in that genus. 

 It is a rare (hell ; we fird obferved dead fpecimens a- 

 amongft the drifted fand in the river Avon in WiliJIiire ; 

 and afterwards found it fparingly, alive, in Lackham 

 wood, in the fame county ; and alfo in a wood clofe to 

 Lord Clifford's houfe in Dcvovjliire. 



lii 2 It 



b. 



