INVERTEBRATE ANIMALS. 23 



cates a fresh-water habit. Estimated number of species : 

 recent, 255 ; British, 12 ; fossil, 195. Tertiary. 



11 Illustrations of the genera in the families Glau- 

 conomyiche, Cyrenicla, Cyrenoidiclce. 



Family VENERID^. 

 Group 65.— Genus TAPES (Megerle) and allies. tajpes, 

 tapestry. Estimated number of species : recent, 257 ; 

 British, 8 ; fossil, 60. Tertiary. 



% Dosinia = Artemis, Ta/pes, Circe, dementia, 

 Rupellaria, dc. Sunetta, fine series of species. 



Group 66. — Genus VENUS and allies. Estimated number 

 of species : recent, 238 ; British, 6 ; fossil, 160 ; from 

 the Oolite upwards. 



II Venus, Callista, Chione, dc. 



Chione Kellettii, from the Dennison collection. 



Family TELLINID^. 



Group 67.— Sub-family DONACIN^ and allies. Wedge- 

 shells. Estimated number of species : recent, 227 ; 

 British, 10 ; fossil, 60. Tertiary. 



^ Donax, Mcsodesma, Semele, Ervilia, dc. 

 Note. — The beautiful interior of Galatea, from 

 African rivers. 



Group 68.— Sub-family TELLININ.E. riWri. (Pliny.) 

 The Tellens, though inferior to the Pectens in striking 

 contrasts of colour, are, in refinement of beauty, at the 

 head of all the bivalve shells. Estimated number of 

 species : recent, 409; British, 20 ; fossil, 134. Oolite, &c. 

 II Tellina, iMcinopsis, Metis, Tellidora, dc. 

 T. lata, and others of great beauty. 



