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



75 a. .ZfoVcfo'-nodular. 1 1 foot. Paper-shales, and very large 

 nodules (sometimes as much as 3 feet long) with heef 

 ahove and below. Microderoceras birclii, large speci- 

 mens; 4953. Arietites plotti; British Museum, 50084. 

 A., sp. nov. ; 2955, L. F. Spath colln. A. pseudo- 

 bonnardi [Spath] ; British Museum, C. 1891. 



74 w. 3 feet. Paper-shales, with occasional irregular and im- 

 persistent beef-seams. Microderoceras sp. ; 4513-58. 



74 v. 3 inches. Thick beef-seam. 



74 u. 2f feet. Paper-shales, with occasional irregular and 

 impersistent beef-seams. 



74 t. 2 inches. Beef, with much decomposed iron -sulphide. 



74 s. 2 feet 10 inches. Paper-shales, with occasional irregular 

 and impersistent beef-seams. 



74 r. 1 inch (PL III, figs. 1 & 2). A double beef -band often 

 enclosing lenticles. Pholidophorus sp. opercular (4431), 

 and preopercular (4432 d). Cymbites laevigatas; 4423, 

 4425. Microderoceras sp. ; 4424, 4426-28 ; 4430. 

 M. ?, sp. nov. ; 4429. Arietites, sp. nov. ; 4434. 



74 q. 8 inches. Paper-shales, with occasional irregular and 

 impersistent beef-seams. 



74 p (PL III, figs. 1 & 2). 3 inches. Tabular to lenticular 

 limestone, with beef. 



74 o. 18 inches. Paper-shales, with occasional irregular and 

 impersistent beef-seams, well-marked at the base. 

 Microderoceras sp. ; 4433. 



74 n. 14 inches. Paper-shales, with occasional irregular and 

 impersistent beef-seams, especially at the base. 



74 m. 23 inches. Paper-shales, with occasional irregular and 

 impersistent beef-seams, and at the base a line of beef 

 with decomposed iron-sulphide above and below it. 

 Microderoceras sp. ; 4343-44. 



74 1. 9 inches. Paper-shales, with occasional irregular and 

 impersistent beef-seams, especially at the base. 



74 k. 13 inches. Paper-shales, with occasional irregular and 

 impersistent beef-seams. 3Iicroderoceras sp. ; 4345. 



74 j. 9 inches. Paper-shales, with occasional irregular and 

 impersistent beef-seams, a layer of decomposed iron- 

 sulphicle at the base, and beneath this an irregular line 

 of beef. Microderoceras sp. ; 4346. 



74 i. 11 inches. Paper-shales, with occasional irregular and 

 impersistent beef-seams, and a band of beef below. 

 Microderoceras sp. ; 4347-48. 



74 h. 6 inches. Paper-shales, with occasional irregular and 

 impersistent beef-seams, and a layer of decomposed iron- 

 suLphide at the base. 



1 For a photograph of a single nodule of the Birc/ii-nodular in place, 

 showing the beef above and below, see op. cit. pi. 40, fig. A. 



