338 



THE OCEAN WORLD. 



Next to Donax comes the genus Tellina, which includes many 

 species of both small and large shells, all remarkable for their beauty 

 of form, and for their brilliant and varied colours. One of these, 

 called the rising sun (Tellina radiata\ is represented in Fig. 137. 



Fig. 140. Tellina donacina (Linnaeus). 



The Tellinas are found in every sea ; the French coast furnishes 

 many species : such as Tellina virgata (Fig. 138) and Tellina sulphured 

 (Lamarck), Fig. 139. In Fig. 140 Tellina donacina is represented 

 with its two tubes or siphons. 



The seventh family, or Mactridae, includes Lutraria and Mactra. 



Fig. 141. Venus verrucosa (Linnaeus). 



They are widely distributed genera, and there are several British 

 species of both. 



The eighth family, Veneridae, includes Venus, Cytherea, Meroe, 

 and Artemis \ beautiful genera, and as such called by Linnaeus and 

 his followers after heroines of Greek mythology; Petricola, Venerupis, 



