62 IffiLIX. SNAIL-SHELL. 
winkled across; and ending in an obtuse point: color pale 
horny, with five brownish bands, the four first close toge¬ 
ther and narrow, the fifth very narrow and surrounding tie 
bottom of the volution; the four upper-ones are marital 
with white, with a white band round the middle, giving 
them a slightly cariuated appearance; aperture larjt, 
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 ; breadth not quite half 
inch. 
Thi3 very beautiful and curious 9hell was found in tie 
neighbourhood of Dublin, by Mr. Stephens ; and in its ge-s 
neral contour has much the resemblance of the Turho sea- 
laris, or Wentletrap, both in the compactness, and tte 
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. Arbustorum; but the number of volutions is seven; 
the aperture is oval; and it has a large and deep perfora¬ 
tion. v. m. 
45. Helix Terebra. Screw Snail-sliell Fig. 55. 
Helix Cochlea. Brown , JVem. Soc. pi. 24. f. 10. 
Shell blackish horn-color, covered with a greenish skin, 
pyramidal, deeply perforated: spires seven, rather rounded 
and well defined; the larger volution with a prominent keel¬ 
like ridge at the base, which continuing round the two next 
forms a strong separating line; the other volutions are 
without this ridge, which gives them the appearance of 
being much more rounded ; t he smaller or terminal spire 
appears detached or separated from its junction with the 
next, like the turn of a corkscrew, and ends rather obi 
tusely: aperture oval, with a thin margin, attached at the 
pointed end to the body volution, and slightly angulated 
by the keel or rib : length somewhat more than half an 
inch ; breadth three eighths of an inch. 
hound by Mr. Stephens, in the botanic garden of Trinity 
College, Dublin. It has something the appearance of H. 
complanata, both in the mouth and the raised terminal rib. 
supposing that shell to have been accidentally produced 
into 
