INVERTEBRATE ANIMALS. 



23 



Group 68.— Sub-family TELLININ^. xeXXv,. (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. 



IT Tellina, Lucinopsis, Metis, Tellidora, dc. 



T. lata, and others of great beauty. 



Group 69. — Family MACTEID^, ju-axxpa, a kneading-trough. 

 Estimated number of species : recent, 188 ; British, 8 ; 

 fossil, 40, chiefly Tertiary. 



U Mactra, Lutraria, Harvella, Raeta, Lahiosa, dc. 



Upper Compartment. 

 Interior of Lutraria, coloured to shew the pallial 

 sinus. Genus A^iatinella is a desideratum. 



Group 70. — Family ANATINIDiE, and alKes. anatinus, 

 pertaining to the duck. Estimated number of species : 

 recent, 190 ; British, 17 ; fossil, 350. Devonian, &c. 

 H Thracia, Myockama, Corhula, Periploma, Pan- 

 dora, dc. Pholadomya, extremely rare, and 

 a desideratum in a recent state, is a magnifi- 

 cent genus of 150 species as seen in its fossil 

 representatives from the Lias, &c. 



Group 71. — Family SOLENID^ and allies. (twXyjv, a 

 gutter-tile. Eazor-shells. Estimated number of species: 

 recent, 24 ; British, 5 ; fossil,60. Eocene, &c. 



IT Mya, Panopcea, Novaculina, dc. Saxicava 

 Angasi. 

 Group 72.— Family PHOLADID^ and others. <poo\slcc, 

 living in holes. Estimated number of species : recent, 

 131 ; British, 14 ; fossil, 60. Eocene, &c. 



IT Clavagella, Brechites = Aspergillum, Pholadidea, 

 Parapholas. The true bivalve shell of Asper- 



