250 R. Etheridge , Jun. — Contributions to British Palceontologg. 
Prof. M'Coy’s description of 0. cylindraceum, Flem. (non Sow.), 1 
"with the exception of the waved septa, would almost embrace our 
species ; on the other Land, it does not correspond with Fleming’s 
original figure, 2 or witli tbe specimen from which this was drawn, as 
I have (tbrough the kindness of Dr. Traquair) ascertained by an 
inspection of it in the “ Fleming Collection,” Museum of Science 
and Art, Edinburgh. Both in 0. cylindraceum, Flem., and 0. 
attenuatum, Flem. (non Sow.), the septa are much more numerous, 
and the intervals between them relatively too broad for their height. 
On the whole, I think we may consider 0. Browtiianum as closely 
allied to 0. calamus, de Kon. 
Loc. and Horizon . — Bed F, or Ardross Limestone, of the Bev. T. 
Brown, on sliore east of Ardross Castle, near Elie, Fife. This so- 
called limestone consists of three bands of an impure limestone 
separated by thin shales, and is well displayed on the beach at high- 
water mark, at the above locality. The Bev. T. Brown, in bis 
paper before alluded to, speaks of these bands collectively as one, 
and places it as the lowest of six limestones near the base of what 
we usually call the Carboniferous Limestone Series. According, 
however, to Mr. Brown’s explanation of the geology of this part of 
Fife, the Ardross Limestone will be some 1400 ft. above the base of 
this series, the 1400 ft. in question being taken from the upper part 
of Mr. Maclaren’s Calciferous Sandstone Series (= L. Carboniferous), 
and tacked on to the hitherto supposed base of the Carboniferous 
Limestone Series. 3 The Geological Survey Map of this part of 
Fife 4 by Mr. Howell, represents the patch in which this limestone 
occurs as Lower Carboniferous (Cemeut-stone Group). I have much 
pleasure in naming this Orthoceras after the Bev. Mr. Brown, to 
whom I am indebted for the loan of the figured specimen, and 
Information relating to the Fifeshire coast. 
EXPLANATION OF PLATE XII. 
Fig. I . — Pectcn Sowerbii, M‘Coy ; nat. size. Cement Stone, L. Carb. Limestone 
Group. Brewsterland Quarry, E. Kilbride. Cabinet of Mr. A. Patton. 
,, 2. — Tbe same ; nat. size. L. Carb. Limestone Group, Merry and Cuning- 
hame’s Iron and Liraestone Pit, near Carluke. Coli. Geol. Survey of 
Scotland. 
„ 3. — The same ; nat. size. Shale above No. 1 Limestone, L. Carb. Limestone 
Group, Whitfield Old Quarry, near Macbiehill Station, Peeblessbire. 
Coli. Geol. Survey of Scotland. 
„ 4. — Aviculopecten papyraceus, Sow.; nat. size. Lower Coal-measuros, Lanca- 
sbire. Coli. Mus. Pract. Geology, London. 
,, 5. — The same. Yarious forms of the ribbing, magnified. 
„ 6. — Anthracomya P/tillipsii, Will. ; nat. size. Coal-measures, Bradford. 
Cabinet of E. W. Binney, Esq. 
,, 7. — The same; nat. size. Coal-measures, Ardwick. Cabinet of Prof. W. C. 
Williamson. 
„ 8 .—A. Scotica, It. Eth., jun. ; twice nat. size. Cement-stone Group, L. 
Carboniferous, Mid Calder. Coli. Geol. Survey, Scotland. 
,, 9. — Slab showing crushed specimens of Sanguinolites ? Abdenensis, B. Eth., 
jun. ; nat. size. L. Carb. Limestone Group, Abden, near Einghorn. 
1 Brit. Pal. Foss., p. 569. 
2 Annals Phil. 1815, vol. v. p. 202, t. 31. f. 3. 
3 Brown, l.c., p. 391. 4 Sheet 41, Scotland. 
