44 Correspondence — Dr. Anton Fritsch. 



tion of particular plates in which specific names make their first 

 appearance, and I have noticed in several instances that writers have 

 consequently been unable to give the exact date of publication 

 to such names. As I am fortunate enough to possess a copy in 

 which the original covers are preserved, I have thought it well to 

 record the dates of publication of the different parts, and the num- 

 bers of the plates contained in each, viz. — 



1846. Part I. Plates 1—12. 

 13—22 and 13 a (double). 



1847. „ III. „ 12A, 12B, 12 C, 12D, 14A, 14 B, 18A, 19 A, 

 20 A, 23, 24, 24 A. 



25—33, and 25 A, 29 A. 

 34—45. 

 46—56. 

 157—68. 

 69—80. 

 1849. „ IX. ,, 81—92. 

 The Lodge, Harpenden, Herts. R. Lydekker. 



„ II. 



„ III. 



„ iv. 



,, v. 



„ VI. 



„ VII. 



„ VIII. 



„ ix. 



FAUNA OF THE GAS-COAL OF BOHEMIA. 



Sir, — In the Geological Magazine for November, 1885, p. 527, 

 Prof. E. D. Cope, in a very kind mention of mj work, " Fauna der 

 Gaskohle in d. Kalksteinen d. Permformation Bohmens," Prag, 1885, 

 asks why I do not agree with him that Cricotus had the thor - acic vertebras 

 embolomerous. Having only had the opportunity of comparing the 

 figure of Cricotus, which I have reproduced on p. 4, band ii. heft i., 

 I saw only the neural arches and the ribs, and on the lumbar 

 vertebrae some bodies which I was inclined to consider elements of 

 rachitomous structure. I feel sure that in the rich material in Prof. 

 Cope's hands he has evidence in support of his opinion that all the 

 vertebras in Cricotus are embolomerous in structure. 



Prague, 3 Nov., 1885. Dr. Anton Fritsch. 



ON SOME CRETACEOUS MADREPORARIA, BY MR. R. F. 

 TOMES, F.G.S. 



Sir, — As Referee of the paper by Mr. R. P. Tomes 'On some im- 

 perfectly known Madreporaria from the Cretaceous Formation of 

 England,' which was withdrawn by the Author from the Geological 

 Society, and is printed in the Geological Magazine for December, 

 1885, p. 541, PI. XIV. 1 take exception to the statement in brackets 

 in the concluding paragraph of the paper on p. 552, "It is now 

 printed verbatim with figures by Mr. C. Berjeau of the specimens 

 exhibited at that meeting," as calculated to mislead. It is true that 

 the originals of some of the figures on the Plate accompanying the 

 paper were exhibited at the Meeting, but the original specimens of 

 Figs. 1, 2, 3, 4, 5, 6, were not shown on that occasion. Further, in 

 the Explanation of the Plate on p. 552, it is stated: "Fig. 7. Bhiz- 

 angia marnilliforntis. Three corallites united by the stolon." Fig. 8. 

 lb. Two corallites similarly united." In the originals, however, 



