I90I S. S. BUCKMAN— BRACHIOPODA 251 



eniarginata — the long -looped, septate Terebratuloids 

 having been separated as Waldheimia. These specimens 

 are truly enough from the Inferior Oolite ; but they do 

 not at all agree with Sowerby's shells except in being 

 bilobate. The view, fig. \\a, shows almost a circular 

 form, whereas the same view of Sowerby's shells gives a 

 depressed octagonal figure. 



In 1878 Davidson figured the same two specimens ;* 

 and he also depicted another bilobate example very different 

 from them. It is undoubtedly from the Inferior Oofite, 

 and, as he says, from Bradford Abbas. It is more like 

 the Sowerbyan specimens, but it is somewhat proportion- 

 ately longer and its valves are more flat across. It is 

 well known what this specimen represents, although the 

 majority of the examples from the Dorset Inferior Oolite 

 arc rather longer ; it is the form which has of late years 

 been exclusively known as Waldheimia, or Zeilleria, emar- 

 ginata. It is found in the upper beds of the Inferior 

 Oolite, particularly at Bradford Abbas, Broad Windsor, 

 and Burton Bradstock ; and it has been recorded from the 

 Cotteswolds.f 



So the case about '' einar-ginata'" really stands in this 

 wise : we have three different forms from two different 

 horizons figured by the name of '^ etnarginata" in English 

 literature. Thus there is : 



1. From the Fullers' Earth, a subpentagonal shell with 

 somewhat gibbous valves transversely. 



2. From the Inferior Oolite, a subpentagonal, but rather 

 more elongate shell, with rather flat valves, transversely. 



3. Also from the Inferior Oolite, a subpentagonal shell, 

 with very gibbous valves, transversely. 



Of these three forms, i is that which is entitled to the 

 name eiuarginata, Sowerby ; 2, though hitherto known as 



* "Monograph Biacliiopoda ; Oolitic and Liassic," Suppl. pi. xxiii., figs. 5—7. 



t See the Author's " Bajocian of the Mid-Cotteswolds," Quart. Jourii. Geol. See, 

 Vol. li., p. 440, 1895 



