PLATE CXL 



TROCHUS TERRESTRIS. 



LAND TOP SHELL. 

 GENERIC CHARACTER. 



Animal a slug. Shell conic, aperture nearly triangular. 



SPECIFIC CHARACTER. 



Rather conic, whitish, with a spiral brown streak along the middle 



of the wreaths. 



Trochus Terrestris : testa subconica albida anfractibus linea 



media fusca. 

 Trochus Terrestris, Land. Perm. Brit. ZooL No. 108. tab. 80. 



fig. 108. 

 Trochus Terrestris tertius. Da Costa Br. Conch, p. 36. C. 



Pennant describes this new British species of Land Trochus upon 

 the authority of Mr. Hudson, who discovered it upon the Mountains 

 of Cumberland. Da Costa therefore places it as a distinct species, but 

 expresses some doubt whether it may not be the same Land Trochus 

 as Dr. Lister found in the moss at the roots of the large trees in 

 Burwell woods, in Lincolnshire, and to w r hich the shell found by 

 Mr. Morton, in Morsley wood, Northamptonshire, bears great 

 affinity. Dr. Lister's shell had six or seven wreaths, and Mr. Mor- 

 ton's only five. Mort, Northampt. ch. 7. p. 415. 



