86 EXPLANATION OF THE PLATES, 
PLATE XXIX. 
FOSSILS OF THE OLD RED SANDSTONE OR DEVONIAN 
ROCKS. 
AMORPHOZOA. 
Fig. 1.—a, b. SrROMATOPORA CONCENTRICA, Goldfuss. 
Petref. Germania, vol. i., p. 22. Phil. Pal. Foss., p. 18, pl. x., fig. 28. 
a. Original. Transverse section. Middle Devonian, Torquay, South Devon. 
Mus. G. S. I. 6. Original. Enlarged portion of the same, showing 
concentric laminz, traversed by slender tubes. 
MIppLE DevoniAn:—Chudleigh, Torquay, Dartington, and Asholt Common, 
Quantock Hills, Somersetshire. Collected by the late Mr. Jukes. 
Mus. G. S. I. 
Fic. 2.—a, b, STROMATOPORA PLACENTA, Lonsdale, sp. 
Coscinopora, Geol. Trans., 2nd ser., vol. v. 
Caunopora, Phillips, Pal. Foss., p. 18, pl. x., fig, 29. Stromatopora, Morris, 
Catal. Brit. Foss., p. 65. 
a. Original. Transverse section. Middle Devonian, Torquay. Mus. G. S. I. 
b. Original. Enlarged portion of the same, showing large and smaller tubuli, 
or pores. 
Meee eae IAN.—Torquay, Plymouth, Ogwell, &e. 
ZOOPHYTA.—ANTHOZOA. 
Fic. 3.—a-d. PLEURODICTYUM PROBLEMATICUM, Goldfuss. 
Petr. Ger., vol.i., p. 113. Phil. Pal. Foss., p. 19, pl. ix., fig. 24. M.G@.S.1. 
Explan. of Sheets, 187, &c., pp. 24, 28, fig. 5, a-g. 
a. Original. A group of Corallites. 4. Original. Two of these corallites 
enlarged three diameters, united by intercellular structure. ¢. Original. 
Natural horizontal section of a group of corallites, showing their 
hexagonal form, and union, by intercellular structure. d. Original. 
Portion of the same, enlarged. All from Upper Devonian, Pilton beds, 
Braunton, North Devon. Mus. G.S. I. 
Devonian and Lower Carsonirrrous.— Upper Devonian (Pilton beds), 
Braunton. Middle Devonian (Ilfracombe group), West Ogwell; Tor- 
quay. Lower Devonian, Meadsfoot, near Torquay ; Looe, Cornwall. ‘ It 
is confined to slate rocks, and, according to Mr. Godwin-Austen, ranges 
through the whole middle slate district of North Wales.” Davidson in 
