178 CLASS II. BRACHIOPODA. FAMILY 1. TENDINOSA. 



Family 1. TENDINOSA. 



Testa vel tendine breviusculo, fibroso, vel pediculo plus minusve elongato, 

 pendente affixa. 



The tendinous Brachiopoda are divided from the sessile in the same 

 manner as the Lepades ; the pedicle of the former, however, differs from 

 that of the latter tribe of animals both in its situation and use. Instead 

 of being a firm support to the shell, as in most of the Lepades, or used 

 for the injection of the eggs, it serves merely as a pendant, giving to the 

 animal but a limited sphere of motion. Many of them, however, are 

 attached by a number of short fibres passing out through an orifice in 

 the under valve. They are divided accordingly into two genera ; in the 

 former the shell is equivalve, in the latter it is inequivalve. 



Lingula. 



Terebratula. 



LINGULA, Bruguiere. 



Testa tenuis vel cornea vel calcarea, viridis, interdum rubicundula, aequi- 

 valvis, aequilateralis, pediculo affixa ; apice subrostrato, srepissime 

 pervio, basi subacuta interdum hiante. Impressiones musculares in 

 utraque valva dure proxime imbutse. Cardo nullus. 



Until within the last few years only one species of Lingula was known ; 

 and previous to the publication of Cuvier's anatomical investigation of 

 the animal its sheli gave rise to much speculation amongst naturalists. 



