UNIVALVE SHITLLS. 45 



taining'the colouring matter, is a longitudinal vein, just undor tlie skin on 

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

 the vein is laid open with a needle, a tenaciou'? 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- 

 sume 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 Undatum.— The Waved Buccinum. Plate II. fig. 

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

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

 tudinal striae ; 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. 



Stromhus Pes-Pelicnni. — Pelican's Foot Strojibus. Plate 

 VIII. fig. 25. (Rostellaria Pes-PeUcani, 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. 



Stromhus 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. 



