174 Prof. H. A. NicJiohon — On HemipJiyllum silurieme, Tomes. 



be added to the long list of synonyms which already afflict the 

 students of Palgeozoic Corals. 



In the second place, with regard to the specific determination of 

 Mr. Tomes's Coral, it may at once be unhesitatingly stated that it has 

 no relation of any kind to the form which M'Goy described as 

 Cyathaxonia sUuriensis. Of all the troublesome little cup-corals of 

 the Silurian and Devonian rocks, I do not know one so clearly marked 

 ofiF and so easily recognized by its general aspect and characters as 

 this rare form, and I am at a loss to imagine what should have led 

 Mr. Tomes to suppose that he had to deal with examples of this 

 species. That Cyathaxonia sUuriensis, M'Coy, is not a species of 

 Cyathaxonia, Mich., but that it is truly referable to the genus Lind- 

 stroemia has been formerly pointed out by Mr. E. Etheridge, jun., 

 and myself (Mon. Sil. Foss. Girvan, p. 82, 1880). Our determination 

 was based simply upon a macroscopic examination of the species ; 

 but I have since then examined the species by means of thin sections, 

 and have completely confirmed our reference of it to Lindstroemia. I 

 shall take an early opportunity of publishing a description and 

 figures of its internal structure. 



The Hemiphylium sihiriense of Mr. Tomes is not, however, refer- 

 able to any recorded species of the genus Calostylis, Lindst. So far 

 as I am aware, only two species of Calostylis have been previously 

 described, both of these being from the Silurian rocks. One of these 

 is G. denticulata, Kjerulf, fully described and figured by Lindstrom, 

 first under the name of C. cribraria, and subsequently under the 

 above title {loc. cit. supra). The second species was described, from 

 British specimens, by Mr. R. Etheridge, jun., and myself (Mon. 

 Sil. Foss. Girvan, p. 65, pi. v. figs. 2 — 2c, 1880), under the name of 

 C. Lindstromi. Neither of these species agrees in its characters 

 with the form which Mr. Tomes has had under examination. This 

 I am the better able to affirm as I have not only fully examined the 

 two recorded species of Calostylis, but I am well acquainted with the 

 species here in question. My friend. Dr. George J. Hinde, in fact, pre- 

 sented me with specimens of this form, from the Wenlock Shales of 

 Buildwas, some years ago, since which time they have lain in my 

 cabinet with the MS. name of Calostylis hreviuscula appended to 

 them ; but I have never found time to publish a description of the 

 species. 



Lastly, with regard to the Corals to which Mr. Tomes refers under 

 the name of Cyathaxonia Dalmani, E. and H., I may point out that 

 Dr. Lindstrom long ago recognized that the Coral so named did not 

 belong to the genus Cyathaxonia at all. The correctness of this view 

 was demonstrated by Mr. R. Etheridge, jun., and myself (Mon. Sil. 

 Foss. Girvan, p. 84, fig. 4), who showed that C. Dalmani, E. & H., 

 belonged properly to the genus Lindstroemia, Nich. and Eth. jun., a 

 determination which has been since accepted by Dr. Lindstrom 

 himself (List of the Fossils of the Upper Sil. Form, of Gotland, p. 

 19, 1885). 



