SILURIAN CORALS. 



691 



are two young germs, in which the star is only developed in part, 12 d represents perfectly 

 formed young corals. 



Syn. and Ref. Madrepora, Fougt, 1745, Linn. Amcen. Acad. t. i. p. 196. f. 10. 1749. 

 Madrepora truncata. Linn. 10th Edit. t. i. p. 795. 1758 j Parkinson, Org. Rem. vol. ii. p. 47* 

 PI. V. f. 2. 1808. 



Strombodes truncatum, Schweigger, Beobacht. Tab. VI. 1819. 

 Madreporites truncatus, Schlotheim, Petref. p. 355. 1820. 



Cyathophyllum dianthus, Goldfuss Petref. p. 54. Taf. XV. f. 13, Taf. XVI. f. 1. 1826 ; Ehren- 

 berg, 1831, Abhandl. Akad. Berlin. 1832, p. 312 j Milne Edwards, 2nd Edit. Lamarck, t. ii. 

 p. 427. 1836. 



Formations and localities in England. Wenlock Limestone, Ledbury, Haven near 



Aymestry, Wenlock Edge. 

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



Hucogne, Prov. of Liege, Dumont. 

 Cystiphyllum, Lons., Kxxsr^ vesica, <puXXov folium. 



Turbinated, or cylindrical, fixed, single, or united in groups by secretion from the animal 

 while living. Externally, striated ; internally, composed of small bladder-like cells. No distinct 

 centre. Terminal cup deep, surface uneven conforming to the shape of the cells, and traversed 

 by interrupted striae. 



This separation from the Cyathophylla of Goldfuss appears to be justified by the singularity 

 of the internal structure, and the absence of a distinct centre. 

 Cystiphyllum Siluriense. Lons., PI. 16 bis. f. 1, 1 a, 2, nat. size, f. 2 from Mr. Bowerbank's col- 

 lection. 



C. Turbinated, fixed, externally strongly striated, internally composed of cells irregular in form, 

 arrangement, and the thickness of the partitions. 



Syn. and Ref. Cyathophyllum vesiculosum, Goldfuss, Petref., p. 58. Taf. XVII. f. 5. Taf. 

 XVIII. f. 1. 1826. 



Goldfuss's specific character having been adopted to mark the genus, it has been thought 

 necessary to change the specific name. 



Formation and localities in England. Wenlock Limestone, Wenlock, Dudley. 

 Foreign locality and authority. Eifel, Goldfuss. 

 Cystiphyllum cylindricum, sp. n. Lons., PI. 16 Ms. f. 3, 3 a, 3 b nat. size. 



C. Cylindrical, straight or curved, fixed ; externally rugose and striated ; internally wholly 

 vesicular ; terminal cup deep, surface large protuberances, traversed by dotted rays ; no di- 

 stinct centre. 



Formation and locality. Wenlock Limestone, Benthall Edge. 

 Strombodes, Schweigger. 



Strombodes plicatum (Ehrenberg). PI. 16 his. f. 4, 4 a to 4 e. — 4, 4 a reduced one-third, 4 b, 4 c nat. 

 size. 



Syn. and Ref. Cyathophyllum plicatum, Goldfuss, Petref. p. 59. Taf. XVIII. f. 5. 1826; 

 Milne Edwards, 2nd Edit. Lamarck, t. ii. p. 431, 1836. 



Strombodes plicatum, Ehrenberg, 1831, Abhandl. Konig. Akad. Berlin, p. 312. 1832. 



This coral is essentially distinguished from Cyathophyllum and Cystiphyllum by internal 

 structure, the centre consisting not of transverse plates, resembling the septa of a Nautilus, 

 or of bladder-like cells, but of lamellae contorted spirally. In the description of Strombodes 



