SILURIAN CORALS. 



687 



Madreporites stellatus, Schlotheim, Petref., p. 362, 1820. 



Astrea porosa, Goldfuss, Petref., p. 64. Taf. XXL, f. 7« 1826 ; Hisinger, Lethsea Suecica, 

 p. 98. Tab. XXVIII. f. 2. 1837- 



Astrea interstincta, Hisinger, Esquisse, Petref. Suede, 2nd Edit. p. 36. 1831. 



Madrepora Porites, Ehrenberg, 1831 ; Abhandl. Konig. Akad. Berlin, p. 344. 1832. 



Heliopora pyriformis, De Blainville, Man. d'Actinologie, p. 392. 1834; Steininger, Mem. 



Soc. Geol. France, t.l. p. 346. 1834; Milne Edwards, 2nd Edit. Lamarck, t.2. ipASfnote. 1836. 



Heliopora interstincta, Bronn, Lethaea Geognostica, vol. i. p. 48. Tab. V. f. 4. 1835. 



Formations and localities in England. Aymestry Limestone, or Middle Ludlow Rock, 

 Aymestry, Tatter Edge ; Wenlock Limestone, Wenlock Edge, Lincoln Hill, Benthall 

 Edge, Haven near Aymestry, Lindells, Winslow Mill and Foivnhope, in the Valley of 

 Woolhope, Newswood, Eastnor Park, and Ledbury ; Wenlock Shale, Delves Green, 

 Walsall ; Caradoc Sandstone, Mar toes Pay, Pembrokeshire. 



Foreign localities and authorities. Shores of the Baltic, Fougt ; Gothland, Schlotheim, Hi- 

 singer ; Eifel, Schlotheim, Goldfuss, Steininger ; near Pensherg, Goldfuss. 

 Porites tubulata, sp. n. Lons. PI. 16. f. 3, 3a to 3 /. — 3, Sa upper surface nat. size and magnified 



twice, Sb vertical weathered surface, 3 c, 3 d transverse section nat. size and magnified, 3e 



vertical section, 3 / a small variety nat. size. 



P. Hemispherical, stars circular, margin crenated and projecting, rays 12 j interstices short 

 lamellae ; transverse section, stars well-defined, rays often indistinct, interstices, lamella) irre- 

 gularly united ; vertical section, stellular tubes with transverse septa, interstices, lamellae 

 obliquely united. Under surface rugose, or strongly marked by inequalities of growth ; the 

 stellular tubes sometimes exhibited distinctly from the substance of the coral. 

 Formations and localities. Wenlock Limestone, Valley of Woolhope, Benthall Edge, Led- 

 bury, fVoodside near Nash Scar, Fownhope, Western flank of Malvern Hills, between 

 Asten Ingham and May Hill. 



Porites petalliformis, sp. n. Lons. PI. 16. f. 4 nat. size, 4a section parallel to the surface nat. size. 

 P. Hemispherical, star circular, excavated ; interstices irregularly laminated, the first row of 

 lamellae resembling in arrangement the petals of a flower. Under surface rugose. Vertical 

 section, with tubes ; transverse septa, interstices, lamella? obliquely united. 

 Formation and locality. Wenlock Shale, Delves Green, W alsall. 



Porites expatiata, sp. n. Lons. PI. 15. f. 3, 3 a nat. size and stars magnified. 



P. Irregularly lobed, or spread out, in layers alternating with sedimentary matter ; stars small 

 united, undefined, rays 12 ; no interstices. 



Formations and localities. Middle Ludlow Rock, Aymestry; Wenlock Limestone, 

 Lincoln Hill, Colebrook Dale, Benthall Edge, Wenlock, Aston Ingham near May 

 Hill, Lindells, Woolhope* 

 Porites inordinata, sp. n. Lons. PI. 16 bis. 12, 12 a to 12 c— 12 nat. size, 12a stars magnified, 12b 

 casts of the stars, 12 c transverse sections of the stems. 



P. Branched ; branches bifurcated, slender, cylindrical, straight, or curved ; stars impressed, 

 not regularly disposed, sometimes crowded, sometimes distant, rays twelve, centre united 

 papillae, interstices reticulated. Internal structure indistinct. 



This beautiful fossil generally presents a yellow or cream-coloured crust, exhibiting the above 

 character, and investing a nucleus of grey carbonate of lime. This crust, however, cannot be 

 separated mechanically in the same manner as in recent corticiferous corals. It is insoluble in 



4 s 2 



