UNIVALVE SHELLS. 45 



taining the colouring matter, is a longitudinal vein, just under the skin on 

 the back, behind the head, appearing whiter than the rest of the animal. If 

 the vein is laid open with a needle, a tenacious yellow matter will flow, 

 which being applied with a hair pencil to linen, silk, or paper, will in a short 

 time become of a bright yellow, will soon change to pale green, then as- 

 eurae a bluish cast, and afterwards a deep and brilliant purple. These 

 changes are more or less accelerated by the presence or absence of the solar 

 rays : but even without the influence of the sun, it will go through all these 

 changes in two or three hours. Neither air, light, nor washing can after, 

 wards alter its hue. 



The Buccina generally inhabit the ocean, with the exception of a very few 

 species, which are found on the earth. 



Buccinum Undatunu—TnE Waved Buccintoi. Plate II. fig. 

 10. Shell with from seven to eight ventricose volutions, and 

 undulated ribs ; transversely striated, and crossed with fine longi- 

 tudinal striaB ; pillar-lip reflected, and glabrous. Inside white, 

 and deep yellow in some. Four inches long. 



A common shell on most of the British shores 

 F Body, M M the pillar or columella, q canal or gutter. 



Genus 25. — S TROMBUS. 



Animal a Limax ; — shell univalve and spiral ; aperture much 

 dilated ; the lip expanding and produced into a groove leaning 

 to the left. 



Linne divides the Strombi into four families : »lip projecting into linear 

 divisions or claws ; **lobed ; »**dilated ; ****tapering, with a very long 

 spire. 



Strombus Pes-Pelicani. — FELiCAii's Foot Strombus. Plate 

 VIII. fig. 25. (Rostellaria Pes-Pelicani, Lamarck.) Volutions 

 surrounded by a row of tubercles ; lip expanded into four pal- 

 mate angular claws ; body with two rows of tubercles, grey or 

 reddish-brown. Two inches long. Inhabits the British coasts. 



The shells composing this genus inhabit the ocean, and are in general 

 found on rocky shores. 



Strombus pugilis. — The Fighting Strombus. Plate III. 

 fig. 8. Anterior lip prominent, rounded, smooth ; spire spinous ; 

 beak three-lobed, obtuse, flesh-coloured, reddish or brownish, 

 within paler and polished ; back smooth ; first whorl of the 

 spire crowned with spines, which in the others grow gradually 

 less ; the outermost whorl cancellate ; pillar-lip much reflected ; 

 three and a half inches long. 



Inhabits South America, and the shores of the West India 

 islands. 



