32 Scientific Proceedings, Royal Dublin Society. 



CoDASTER TRILOBATUS AND ACUTUS, M'CoY : 



Of this genus (belonging to the same class of Echinodermata, 

 the Blastoidea), established by M'Coy under the above name, 1 he 

 describes two species which appear to be identical. 



Some years ago I was fortunate enough to collect several well- 

 preserved specimens of this fossil, which I refer to C. trilobatus, as 

 indicative of the most usual form, resembling very much that of a 

 hazel nut, although there are gradations between both that and 

 the variety M'Ooy has figured under the name of C. acutus. 



As I believe it has never yet been recorded from Ireland, I now 

 bring it before the notice of this Society. 



Our specimens were obtained from shales between the carboni- 

 ferous limestone at an old quarry at Lisdowney, near Ballyragget, 

 county Kilkenny ; collection, Geological Survey of Ireland. 



Its locality in England is stated in the Synopsis to be Bolland, 

 Derbyshire. 



Plate i., figs. 3, 4, 4a, 4b, 5, 5a. 



NOTE ADDED IN THE PEESS. 



Since this Paper was read, Messrs. P. Herbert Carpenter and 

 Kobert Etheridge, Junior, who are studying the subject, requested a 

 loan of the specimens, which, at their request, were submitted to them 

 for their examination. Although agreeing with me that figs. 1, 1a 

 represent a new species (Pentremites pralongus), they consider the form 

 represented on figs. 2 and 2a as a different species (Orophocrinus pen- 

 tangularis, Miiller sp.). 



1 Synopsis of British Palaeozoic Fossils, 1885, pp. 122, 123, pi. 3d, figs. 7, 8; 

 Ann. and Mag. Nat. Hist., 2nd series, 1849, vol. iii. 251. 



