SILURIAN CORALS. 



693 



and Downton on the Rock near Ludlow, Botville near Church Stretton. Wenlock 

 Limestone and Shale, Newswood, Eastnor Park and West flank of Malvern Hills near 

 Presteign. Caradoc Sandstone, Marloes Bay, Pembrokeshire j Goleugoed, Llandovery, 

 Bog Mine Shelve, Salop. 



In the Caradoc Sandstone of the Lackey, casts are found of more than one distinct species, 

 probably belonging to this genus, but the specimens which have been examined were too im- 

 perfect to be satisfactorily determined. One of these casts is represented in PI. 16 bis. f. 6, 6 a. 

 Cyclolites, Lamarck. 



Cyclolites lenticulata, Lons. PI. 15. f. 5, 5 5 under surface, 5 a upper, 5 b section. 



C. oval, thin ; under surface faint, concentric striae, traversed by radii; upper surface, broad, 

 tuberculated lamellae ; centre depressed. 



Syn. and Ref. Madrepora, radiis dentatis, Fougt, 1745, Linn. Amcen. Acad. 1. 1. p. 194. 

 fig, 5. 1749. 



Madrepora porpita, Gmelin, p. 3756 ; Esper. Petrif. Tab. 1. f. 1—3. 1797- 

 Cyclolites numismalis, Lamarck, Anim. sans Vert. t. ii. p. 233. 1816 5 Schweigger, Beobach. 

 VI. 1816; De Blainville, Man. d'Actinol. p. 335. PI. LI. fig. 1. 1834; Milne Edwards, 2nd 

 Edit. Lamarck, t. ii. p. 367- 1836. 



Porpites lenticulatus, Schlotheim, Petref. p. 350. 1820. 



Some confusion having arisen from the Madrepora porpita of Gmelin, the fossil of the 

 Baltic, the Fungia numismalis of Goldfuss, a coral rag fossil, (see Count F. Mandelsloh, 

 Mem. sur la Constitution geologique de V Albe du Wurtemberg,) and a recent coral having been 

 included in Lamarck's species Cyclolites numismalis, it has been thought advisable to adopt 

 Schlotheim's specific name. 



Formation and locality in England. Upper Silurian Rocks, Marloes Bay, clearly overlying 

 the equivalent of the Wenlock Limestone, in strata of about the age of the middle Ludlow 

 Rock. 



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

 Cyclolites prceacuta, Lons. PI. 15. f. 4 nat. size. 



C. oval, very thin : under surface, faint concentric striae : upper surface, lamellae sharp-edged, 

 smooth : centre not visible. 



Syn. and Ref. C. numismalis, Hisinger, Lethsea Suecica, p. 100. Tab. XXVIII. f. 5. 



Hisinger has adopted his specific name from Lamarck, but for the reason already given, it 

 has been considered advisable to propose another. This fossil differs also in the form of the 

 lamellae on the upper surface, from the Madrepora porpita of Gmelin and Fougt, the C. nu- 

 mismalis of Lamarck. In C. prceacuta they are sharp-edged and smooth, in C. lenticulata or 

 numismalis they are broad and tuberculated. 



Formation and locality in England. Upper Silurian Rocks, Marloes Bay. Same position as 

 C. lenticulata. 



Foreign locality. Shores of Gothland, and very rarely in the limestone rocks, Hisinger. 

 Verticillipora, De France. 



Verticillipora? abnormis, sp. n. Lons. PI. 16 bis. f. 10, 10a to 10 c? nat. size. 10a section through 

 the centre of 10, 10 b surface pores magnified, 10 c apparently younger specimens with a cen- 

 tral cavity, 10 d part of the surface removed, exhibiting the vertical tubes and an indication of 

 concentric crusts similar to those at the base of f. 10. 



V. irregularly branched; centre, hollow, or filled; branches composed of fine contiguous 



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