236 NOTES ON THE BEITISH JUEASSIC BEACHIOPODA. 



GLOSSOTHYRIS, Doaville, 1879. 

 Etym. — yX(x)(rcrr), a tongue ; 6vpi<;, a small opening'. 



One of the distingaishing features in Glossothyris is tlie 

 pronounced sulcus in the imperforate or dorsal valve. 



Davidson objected to this genus on the ground that it 

 seemed to him to be based upon very deceptive external 

 characters. He considered it a synonym of Terehratula, and 

 therefore included Glossothyris curviconcha from the Inferior 

 Oolite of Dorset, and Glos. hakerias,^ from the Middle Lias of 

 Northants in that genus, species which, according to Douville 

 and some other authors, are generically distinct. 



Glos. (?) curvifrons, galeiformis^ and provincialis, all from 

 the Inferior Oolite, are species closely allied to Glossothyris ; 

 they certainly do not belong to the Terehratula of Douville 

 (13). It may be mentioned that CEhlert makes Glossothyris 

 a section of his Terehratula, and not a distinct genus 

 (16, p. 1316). 



The above species, with the exception of Glos. (?) curvi- 

 frons, are very rare. 



WALDHEIMIA, King, 1850, et auctorum. 



Etym. — Dedicated to Eischer de Waldheim, naturalist. 



Prior to 1850, all the species to which we now give the 

 familiar generic title Waldheiviia were included in Tere- 

 hratula, although it was generally known that the former 

 possessed a mesial septum and a long loop, while the latter 

 had a short loop and no mesial septum. Professor William 

 King, to whom we are indebted for several well-known 

 genera of Brachiopods, recognised the necessity of making 

 two groups of these Terebratuloids, and proposed the term 

 Waldheimia for the former. He gave a diagnosis of the 



1 Figured by Davidson as Wald. bakerice. 



