I90I S. S. BUCKMAN — BRACHIOPODA 255 



Date of Existence : — Truellii hemera, most likely; or 

 possibly zigzag hemera. 



9. (4) ZEILLERIA SUBCORNUTA, S. Biukman, sp. n. 



PI. XIII., fig. 7. 



Description: — Valves about equally convex; front margin indented, 

 and a depression running up each valve. Beak small, with defined, sub- 

 acute beak ridges ; beak curved over umbo, and not much separated 

 therefrom. Foramen small. 



Note. — A broader form with less marked indentation 

 may, for the present at any rate, be reckoned as the same 

 species. 



Comparison: — Terebratula imitator is a remarkable 

 homoeomorph. Zeilleria Marine is notable. 



Distinction : — From Z. coi^nuta, the less definite inden- 

 tation, the bilobate (cornute) character less developed, 

 the marginal lobes less marked. From Z. bicornis, the 

 incurved beak. From Z. Maricr, the less incurved beak, 

 less acute beak ridges, smaller foramen, generally flatter 

 form. 



Notes. — In Z. cornuta there is a somewhat quadrilobate 

 appearance ; this species is but bilobate. The similarity 

 to Z. Maries is certainly remarkable, because of the differ- 

 ence in date. There is no difficulty in their separation if 

 the beak be studied. 



Localities and Stratiun: — Dorset: Bradford Abbas, in the 

 railway cutting near Yeovil Junction ; Clifton Maybank, in 

 a temporary opening ; both in the base of so-called " upper 

 beds of Inferior OoHte." 



Date of Existence: — Garantiance hemera. 



There is a certain similarity in the following incipiently 

 bilobate form to the preceding species, so it may be noticed 

 here. 



