BIVALVE MOLLUSCA. 341 
Tapes, Lucinopsis, and Trigona, also belong to the family. These 
inhabit every sea; they are found in every region of the globe, more 
than 150 species being known. In most the shell is elliptic in form, 
the valves either smooth, warted, striated, spiny, or lamellous, some 
like those of Cardium and Donax. Like these, too, they bury them- 
selves in the sand. 
Among the vast number of species, many of them are extremely 
rare, and much sought after by collectors in consequence of their great 
beauty. In the principal ports of France, Venus verrucosa (Fig. 141), 
and another species known in the south of France under the name of 
Clovisse, are eaten there like oysters. Prepared with fine herbs, the 
Clovisse, we have M. Figuier’s authority for saying, is not to be 
Fig. 142.—Cytherea geographica (Chemnitz). 
despised. “We may be believed also,” he says, ‘if we add that 
nothing is more delicious than to eat the living Clovisse torn from the 
rock of the Phara of Lake Thau, when the Mediterranean sun of a 
day in winter is shining down upon us, the heart rejoicing in man- 
hood’s strength.” In PriatE XIII. some of the principal species 
are represented, along with some of the more remarkable species of 
Cytherea. In Fig. 142 we have the elegantly-pencilled shell of Cytherea 
gtographica, together with the animal, both drawn from Nature. 
The sub-section we shall now treat of is without the pallial line 
sinuated. The Cyprinidz form the ninth family of our arrangement, 
and contain the genera Cardita, Cypricardia, Isocardia, Crassatella, 
Astarte, Circe, and Cyprina, which contain among them some hundred 
species. 
‘: The Cycladide are our tenth family, and include Cyrenoides, 
Cyrena, Pisidium, and Cyclas. 
The Lucinide is the eleventh family, containing Galeomma, 
Lepton, Montacuta, Kellia, Diplodonta, Corbis, and Lucina. 
