Ii6 INTRODUCTION TO CONCHOLOGY. 



even of a golden hue. They are, also, remarkable for their 

 symmetry of form and vi\dd blending of bright colours, 

 and are distinguished by their decided tubular growth, as 

 also by not standing pyramidically on their base, like the 

 Troclii. 



A complete monograph of the species, by Mr. Eeeve, in 

 his comprehensive work the ^Conchologia Iconica,^ com- 

 prises sixty species, and shows that their range of habitation 

 is limited to warm climates, cliiefiy the islands of the 

 Eastern Archipelago, AustraKa, and JN'ew Zealand, with the 

 Mediterranean, "West Indies, and California. 



An exuberance of design in the ppamidical shells of the 

 genus Trochus, presents a speciality of character, by which 

 to distinguish it fi'om the Tztrho. In every species pertain- 

 ing to that genus, when not absolutely smooth, the 

 sculpture, whether ribs, or scales, or tubercles, is arranged 

 transversely, but in the Trochus it is mostly carved longitu- 

 dinally or obliquely, in patterns more varied and fanciful. 

 TrocJiij numerous in species, and widely distributed in 

 almost every part of the world, occur on our own coasts, as 

 also in the Mediterranean, and all tropical latitudes. 



The solitary TrocJiiscus, a native of New Holland, may 

 be described as a compound of Turho, Trochus^ Solarium, 



