I90I S. S. BUCKMAN— BRACHIOPODA 259 



Distinction : — Like Zeilleria Lcckenbyi (Walker), but 

 distinguished by the very unequal convexity of its valves. 



Locality and stratum : — Gloucestershire, Cleeve Hill, 

 in the Phillipsiana beds of the Rolling Bank Quarry ; rare. 



Date of Existence : — Sauzei hemera ? 



Note. — As so many of the Cotteswold Hrachiopoda are 

 specifically distinct from their contemporaries in the Anglo- 

 Norman basin ; and as these particular Phillipsiana beds 

 have, been destroyed by Bajocian denudation except over 

 the Cleeve Hill plateau, it is likely that that place will be 

 the only locality from which the species can be obtained. 



14. TereBRATULA SUBOMALOGASTER, 5. Bnckman, sp.n. 



PI. XIII., figs. 2a, b, c. 



Desciiplion : — Inequivalve, subpentagonal in outline, brachial valve 

 nearly flat, pedical valve convex. Growth lines prominent at intervals. 

 Beak projected, overhanging the umbo considerably ; beak ridges fairly 

 prominent, sub-rounded ; foramen rather large. 



Comparison : — With the heterochronous homoeomorph 

 Zeilleria anisoclines. There is a certain likeness, on 

 account of the transverse ridges, and even in shape, to 

 Dictyothyris Morieri, which occurs almost in the same bed. 



Distinction : — From Terebratula omalogaster, Zieten. 

 Verst. Wiirt. PL xl., fig. 4, by its less transverse shape, 

 and greater compression. 



Remarks : — As the specific name implies, there is con- 

 siderable likeness to Zieten's T. omalogaster, which is 

 similar in inequality of valves, has an overhanging beak, 

 but of less pronounced character ; the shell is, however, 

 remarkably transverse, with a beak, as depicted by Zieten, 

 rounded and largely perforate. 



There is reason to conclude genetic connection between 

 these species ; and as Oppel* states that Zieten's species 



* " Juraformation," p. 426. 



