CORALS FROM THE DEVONIAN FORMATION. 219 



alternate mode of superposition. Great diagonal of the calices about half a hne ; the 

 tabulae are placed at about one tenth of a line apart. 



Found in the Devonian formation at Torquay ; in Spain at Contejo de Castrillon, 

 near Aviles ; in America at Caledonia, New York, at the Falls of Ohio, at Charleston 

 Landing (Indiana), in the Isle of Mackinaw, and, according to Mr. Hall, at William sville, 

 Erie county. Found also in the superior Silurian deposits at Springfield, Ohio, and in 

 Perry county, Tennessee. 



The genus Eramonsia contains two other species — E. alternani and E. cylindrica?' 

 The first differs from the species here described by the alternate arrangement of the mural 

 edges, by the incomplete tabulae being more regular, and by its cahces being larger. 

 E. cylind/rica has calices still larger, and often circular ; it is also (characterised by the 

 existence of four or five lines of pores on each side of the walls. 



3. Genus Alveolites, (p. Ix.) 



1. Alveolites suborbicularis. Tab. XLIX, figs. 1, \a. 



Alveolites suborbicularis, Lamarck, Hist, des Anim. sans Vert., vol. ii, p. 186, 1816; 



2d ed., p. 286. 



— ESCHAROiDES, Lamarck, Hist, des An. sans Vert., vol. ii, p. 186, 1816 ; 



2d ed., p. 286. 

 EscHARiTES SPONGiTES, Schlotheim, Petrefactenkunde, 1st part, p. 345, 1820. 

 Alveolites suborbicularis and escharoides, Lamouroux, Encycl. (Zoopb.) pp. 41, 42, 



1824. 

 Calamopora SPONGITES, var. TuBEROSA, Goldfuss, Petref. Germ., vol. i, p. 80, tab. ii, 



fig. \a—h, 1829. (Cset. excl.) 

 Alveolites escharoidea and suborbicularis, De Blainville, Diet. Sc. Nat., vol. 1.x, p. 269, 



1830.— Manuel, p. 404. 



— SPONGITES, Steininger, Mem. de la Soc. Geol. de France, vol. i, p. 334, pi. 20, 



fig. 4, 1831. 

 Calamopora — Morren, Descr. Cor. in Belg. Rep., p. 74, 1832. 



Favosites — Phillips, Paleeoz. Foss., p. 16, pi. viii, fig. 23, 1841. 



Calamopora suborbicularis, Michelin, Icon., p. 188, pi. 48, fig. 7, 1845. 



— sauAMOSA or IMBRICATA, ibid., p. 189, pi. xlix, fig. 15, 1845. 



Favosites suborbicularis and Alveolites tuberosa, TfOrhigny, Prod, de Palaeont., 



vol. i, pp. 107, 108, 1850. 

 Alveolites — Milne Edwards and Jules Haime, Pol. Foss. des Terr. Palseoz., 



p. 255, 1851. 



Corallum composite, forming irregular incrustated masses, which are in general fixed 

 on ramose favosites or on a cyathophyllum, and are composed of superposed layers, 



' Milne Edwards and Jules Haime, Pol. Foss. des Terr. Palaeoz., p. 248, 1851. 

 2 Favosites cylindrica, Micbelin, Icon., p. 255, pi. Ix, fig. 1, 1846, 



29 



