62 HELIX. SNAIL-SHELL. 



wrinkled across, and ending in an obtuse point : color pale 

 horny, with five brownish bands, the four first close toge'- 

 ther and narrow, the fifth veiy narrow and surrounding the 

 bottom of the volution ; the four upper-ones are marbled 

 with white, with a white band roiind the middle, giving 

 them a slightly carinated appearance ; aperture large, 

 oval, attached to the body at the narrow or pointed end 

 Only ; the margin very thin, slightly reflected at the inner 

 angle, behind which is a deep perforation : length some<- 

 thing more than half an inch j breadth not quite half an 

 inch. 



This very beautiful and curious shell was found in the 

 neighbourhood of Dublin, by Mr. Stephens ; and in its ge- 

 neral contour has much the -resemblance of the Turbo sca- 

 laris, or Wentletrap, both in the compactness, and ,the 

 deeply rounded divisions of the volutions. From the simi- 

 larity of its markings, we should have been almost per- 

 suaded to have considered it as a much produced variety 

 of H. Arbustoriun; but the number of volutions.is seven ; 

 the aperture is oval j and it has a large and deep perfora- 

 tion, v.'vn.'.- 



45. Helix Terebra. Screw Snail-shell Fig. 55. 



Helix Cochlea. Brown, JFcrn. Soc. pi. 24. f. 10.; 



Shell blackish horn-GQloiy covered with a greenish skin, 

 pyramidal, deeply perforated : spires seven, rather rounded 

 and well defined; the larger volution with a prominent keej- 

 like ridge at the fcaie, 'whieR continuing ronncf'the two r?ex?t 

 forms a strcmg .se^atrafciftg line ; the other volutions are 

 with out Ihi^ ridge,- rwhieh: gives them the appearance of 

 being much more rounded ; the small&r or terminal spire- 

 appears detached or separated from its junction with the 

 next, like the turn of a\ corks c,rew., and ends rather ob- 

 tusely : aperture oval, with a thin margin, attached at the 

 pointed ,entl;tp the* -body . volution, and , slightly angulated 

 by the keel pvjib : length somewhat: more than half art. 

 inch ; breadth three, eighths of an in ph. 



Fbun^"by Mr. Stephens, in the botanic garden of Trinity 

 Colloj>:e, ! 'Dublin, It has something the appearance of H. 

 compianata, bo'thinthe mouth and the raised terminal rib, 

 supposing that shell to have been accidentally produced 



into 



