THE BRITISH FOSSIL BRACHIOPODA. 



363 



Loop short. 



Annular by the 



union of the oral 



processes. 



Neither dental 

 nor septal plates. 



Terebratulina, 

 d'Orb. 



Not annular : by the disunion of the oral processes. 



Neither dental nor 

 septal plates. 



Only dental, and no 

 septal plates. 



Terebratula, Klein Zugmeyeria, Waagen 



(New Gen. ?) 



Pygope, Link 



Victyothyris, 



Douville 



Only septal, and no 

 dental plates. 



Rhcetina, Waagen 



Hemipty china, 

 Waagen 



Septal and dental 

 plates. 



Dielasma, King 

 CaenotkyriSyDou- 



ville 

 Dielasmina, 



Waagen 



Biplicata. 



Fimbriates. 



Nucleates. 

 Coarctatce. 



Douville proposes likewise a family Waldheimiida, in which he comprises the following 

 so-termed genera. 



1. Genus Macandrevia, King, 1859 ; type Ter. cranium, Miiller. 



2. Genus Waldheimia, King, 1850; type T. flavescens, Lamarck. 



3. Genus Neothyris, Douville, 1880 ; type W. lenticularis, Deshayes. 



4. Genus Plesiothyris, Douville, 1880 ; type Ter. Verneuili, Deslongchamps. 



5. Genus Zeilleria, Bayle, 1878 ; type T. cormcta, Sow. 



6. Genus Eudesia, King, 1850 ; type T. cardium, Lamarck. 



7. Genus Aulacothyris, Douville, 1880; type T. resupinata, Sow. 



I cannot help considering these so-termed genera to be very nearly connected, and to 

 be synonyms of King's excellent genus Waldheimia. They have all similar loops. 

 Macandrevia, King, type M. cranium, has, however, been adopted by several palaeonto- 

 logists, and I do not know whether I am justified in rejecting it. Most, if not all, 

 of Douville's genera in his family Waldheimiida seem to have been established on external 

 differences, and if such were to be adopted very many more so-termed genera would 

 have to be admitted. I question likewise the propriety or necessity of establishing a 

 second family, or even sub-family, Waldheimiida, for M. Douville includes in his first 

 family Terebratulida forms quite and even more distinct from each other than is Tere- 

 bratula from Waldheimia. They have all in common a loop simply attached to the hinge- 

 plate, which loop is shortest in Terebratula, longer in Ccenothyris, and longest in 

 Waldheimia and Douville's other so-termed genera of Waldheimiida. Consequently I 

 would leave Waldheimia in the sub-family Terebratulida. 



A sub-family, Centronellin;E, proposed by Waagen in IS S3, would, as far as we 

 know at present, probably comprise the following genera : — 



Centronella, Billings, 'Canadian Naturalist,' vol. iv, p. 131, 1859, type C. (Bh.) 

 glansfagea, Hall. 



48 



