176 BRITISH STROMATOPOROIDS. 



structures are often placed at the same level in adjoining tubes, thus giving rise 

 to the appearance of successive continuous concentric lines. 



Distribution. — 8. Carteri, so far as known, is entirely confined to the Wenlock 

 Limestone of Britain ; and my specimens have been principally obtained from the 

 single locality of Ironbridge, in Shropshire, where the species is not altogether 

 uncommon, though vastly more rare than is 8. typica, Rosen. The species has 

 not hitherto been certainly recognised in the Silurian Rocks of Gotland or 

 Esthonia. Mr. "Whiteaves has submitted to me for examination a fragment of a 

 species of Stromatopora, obtained from a loose boulder on the banks of the 

 Hayes River, in Hudson's Bay Territory, which very closely approaches in its 

 characters to 8. Carteri, though my material is not sufficient to justify me in 

 asserting that it is absolutely identical with the latter. 



4. Stromatopora Hupschii, Bargatzlcy sp. PI. X, figs. 8 and 9 ; PI. XXII, figs. 



? Steomatopoea polyhoepha, Phillips. Palaeozoic Fossils of Cornwall, Ac, p. 18, 



pi. x, fig. 27, 1841. (Non Stromatopora 

 poh/morpha, Goldfuss.) 

 ?? Caunopoea placenta, Phillips. Ibid., p. 18, pi. x, fig. 29. 



— — Bargatzky. Die Stroraatoporeii des rheinischen Devons, 



p. 61, 1881. 

 Hupschii, Bargatzky. Ibid., p. 62, 1881. 

 Steomatopoea Beuthii, Maurer. Die Fauna der Kalke von Waldgirraes bei 



Giessen, p. 113, Taf. iii, fig. 5, 1885. (Non 

 Stromatopora Beuthii, Bargatzky.) 

 — indubia, Maurer. Ibid., p. Ill, Taf. iii, figs. 1 — 3. 



? maculosa, Maurer. Ibid., p. 114, Taf. iii, figs. 6 and 7. 



Hupschii, Nicholson. Monogr. Brit. Strom., General Introduc- 

 tion, fig. 6, a, B, and pi. x, figs. 8 and 9 

 (figured but not described). 



The ccenosteum in this species is generally laminar, with a basal epitheca, but 

 it is sometimes massive or irregular in form. Laminar examples vary in thickness 

 from half a centimetre (young forms) to four or five centimetres, and when fully 

 grown are often more or less cake-like in shape. 



Latilamina3 are not at all, or very imperfectly, developed, though, as in most 

 Stromatoporoids, traces of periodic intermissions of growth can be recognised. 

 The " concentric laminas," so far as such can be said to exist, are approximately 

 straight, or are gently curved; and the surface is, therefore, devoid of "mame- 

 lons," at any rate in the typical form of the species. When well preserved, the 



