■60 DR. W. D. LANG ON THE STRATIGRAPHY [vol. lxxix, 



73 j. 14 inches. Fine conchoidal marl. Amioceras sp. cf. 



semicostatum ; 4413. ? Arietites sp. ; 4570, 4414. 



Sulciferites [Spath] sp. cf. dumortieri ; 4584-85. 

 73 i. 1 inch. Thin impersistent beef-seams. 

 73 h. 13 inches. Fine conchoidal marl. Arietites, sp. nov. ; 



4309, 4591. Sulciferites [Spath] sp. cf. angusti- 



sulcatus ; 4586-90. 

 73 g (PL IV, fig. 2). Reef 20, upper limit. 2 inches. 



Persistent, double to manifold beef-seam, occasionally 



enclosing lenticles and nodules. The upper surface of 



this bed, of which a rather wide expanse is often visible 



at the shoreward end of the Reef, presents rough 



irregular ridges radiating from centres, resembling in 



appearance the stools of fossil trees. 

 73 f. Slab by, slightly conchoidal marl. Sulciferites [Spath] 



sp. cf. angusiisulcatus ; 4600-6. 

 73 e. 1 inch. Beef. 

 73 d. 7 inches. Slabby, slightly conchoidal marl. Arietites 



sp. ; 4607-8. 

 73 c. | inch. Iron-sulphide in little crystalline clots. Arietites 



sp. nov. ; 4609. 

 73 b. 6| inches. Slabby, slightly conchoidal marl. 

 73a (PL IV, fig. 2). Reef 20, lower limit 2 inches. 



Double to manifold beef-seam, occasionally enclosing 



lenticles and nodules. 

 72 g. 17 inches. Slabby, slightly conchoidal marl. Amioceras 



sp. cf. semicostatum and A. sp. cf. nodulosum ; 4610-17. 



Avicula sp. near A. infraliasina (Martin) ; 4619. 



? Avicula sp. ; 4618. Rliynchonella sp. ; 4620-24. 

 72 f . 2 inches. Impersistent beef-seams in friable marl. 



Amioceras sp. cf. nodulosum ; 4625. Belemnites sp. ; 



4962. ? Avicula sp. ; 4626. 

 72 e. 13 inches. Bedded marl. Amioceras sp. cf. nodulosum; 



4627-32. Amioceras sp. cf. semicostatum and nodu- 

 losum ; 4383. ? Avicula sp. ; 4389-90. 

 72 d. 6 inches. Impersistent beef-seams in friable marl. 

 72 c. 1 inch. Small lenticles in conchoidal marl. Amioceras 



sp. ; 4288. 

 72 b. 4 inches. Conchoidal marl, passing into 72 a. 

 72 a (PL IV, fig. 2). Reef 19. 10 inches. Indurated marl 



full of Avicula. Amioceras sp. cf. semicostatum; 



863, 865, 869, 2759-66, 2778-80, 3204, 4418-20. 



Amioceras sp. cf. falcaries ; 2783. Amioceras sp. ; 



2781-82. Belemnites sp. ; 4295. Plagiostoma 



giganteum James Sowerby ; 2767. Avicula sp. cf. 



A. inaequivalvis James Sowerbv ; 857-862, 864, 866-68, 



870, 2748-50, 2755-57, 2751-53, 4294,4421. Avicula 



cf. A. jpapyria Quenstedt ; 3203. 

 71 g. 20 inches. Slabby, slightly conchoidal marl. Amioceras 



sp. cf. semicostatum ; 4633-36. Amioceras sp. = 



