Mr. Weaver on the Geological Relations of the South of Ireland. 11 



turbinated shells, one being carinated, the other striated, and a Natica; the Producta depressa (Sow. 

 Min. Con. t. 459. fig. 3.) t*J, and other Productae ; the Spirifera radiata (olim lineata. Sow. t. 493. 

 fig. 1 . 2.), t +. and other Spiriferae ; the Tercbratula prisca of Schlotheim (Tab. 1 7. fig. 2.) • considered 

 as identical with Terehratula affints of Sowerby (t. 324. fig. 2.)f *|, and other Terebratulae, as 

 well as a Pentamerus Sow. (t. 28. 29.) t, and other bivalves, besides casts of the interior of Tere- 

 bratulae, Spiriferse, and Productae, generally designated by German geologists by the name of 

 hysteroUtes ; Polyparia, of the genera Cyathophyllum, Turbinolia, and Favosites ; and also crinoidal 

 remains. The Turbinolia appears closely to resemble the T. celtica of Lamouroux (Tab. 78. 

 fig. 7.)f, also derived, it seems, from a transition tract -• 



Several of these casts so perfectly resemble both in the species of the ori- 

 ginal shell and in composition, similar casts occurring in the Tort worth trans- 

 ition district in Gloucestershiie, which I formerly described ^ that on examin- 

 in<j^ them they might be supposed to have been derived from thence. In 

 both districts the Turbinolia celtica } is common. Some of the casts are 

 also identical with fossils figured by Sir Alexander Crichton as occurring in 

 the transition greywacke and slate of the Duchy of Nassau*. In addition to 

 these remains I have to state that the late Mr. Alexander Nimmo found in 

 the slate, adjacent to Dunmore Head, impressions of plants, which, according 

 to his description, would appear to be referable to Calamites. 



Organic remains are also visible in the greywacke, which protrudes from 

 beneath the old red sandstone at the eastern foot of Sheve Meesh (§ 10), form- 

 ing a low ridge which crosses the river Maine, and extends some distance 

 beyond it. On the right bank of that river, in the lands of Riversville, a 

 quarry, which has been opened eight feet deep, exhibits beds of fine-grained 

 greywacke, from two to six inches thick, with slight layers of slate interposed 

 in the lower part, but alternating in the upper with beds of clay-slate and lime- 

 stone, from four to six or eight inches thick, the whole dipping 12° to 15° to the 

 E. of S. The organic exuvias being closely entangled with the rock, are 

 best discerned where the latter is partially decomposed, and the most common 

 appeared referable to ProductaB, Spiriferae, Terebratulae, Favosites, and Cri- 

 noidea. 



On the eastern side of Ireland, namely, on the banks of the Oom-boy river, 



and Prof. Eaton, Geological Text-Book, 2nd edition.) I collected specimens myself at Louisville 

 and Cincinnati. 



From Dr. Harlan's list it appears that numerous other species of the genera Calymene and 

 Asaphus occur in the transition and carboniferous systems of the United States, but a clear di- 

 vision of them is much wanting. Many of these have not hitherto been noticed in Europe. (See 

 Trans, of Geol. Soc. Pennsylv., vol. i. pp. 99 to 103.) 



' Nachtrage zur Petrefactenkunde. 



* Lamouroux, Exposition methodique des Genres de Polypiers, p. 85. Paris, 1821. 

 3 Geol. Trans. Second Series, vol. i. p. 326 — 329. 



* Geol. Trans. Second Series, vol. ii. plate xxxiii. fig. 1, 4, 5. 



c2 



