SILURIAN CORALS. 



677 



Foreign localities and authorities. Groningen, Goldfuss; Capelhamn and Hoburg in Goth- 

 land, Bursvik, Hisinger. 



Small fragments of probably young specimens of this species are occasionally found in the 

 slabs of Wenlock Limestone ; one of them is represented on PI. 15. f. 11 b, 11 c. 



Glauconome, Goldfuss. 



Goldfuss has described under the generic name of Glauconome five fossils, four of which, ac- 

 cording to De Blainville (Man. d'Actinologie, p. 454.) and Milne Edwards (2nd Edit. La- 

 marck, t. ii. p. 193.), belong to the genus Fincularia, previously established by De France 

 (Diet. Sc. Nat. torn, lviii. p. 214.). The fifth species, common at Dudley, possesses, however, 

 characters essentially different from those of Fincularia, and even from those assigned to 

 Glauconome by Goldfuss. Instead of the stem being impressed on all sides with rows of cells, 

 it has them over only half the surface, the other half being striated longitudinally. It is pro- 

 bable that the position of the fossil in the matrix prevented that author from detecting the true 

 characters of the coral. For this fossil it has been thought right to retain Goldfuss's name, 

 but a modification in both the generic and specific characters has become necessary. 

 Gem Char. — Stem stony, thin, elongated, oval, branched ; cells disposed longitudinally and 

 alternately in rows over one half the surface, the other half striated longitudinally. Nature of 

 the covering and opening of the cells unknown. 



Glauconome disticha (Goldfuss), PI. 15. f. 12, 12 a to 12 d. — 12, 12 a cellular surface nat. size, 12 b 

 is 12 magnified twice, 12 c, 12 d striated surface nat. size and magnified twice. 



G. Stem branched, the branches diverging nearly at right angles both from the central stem 

 and from the lateral branches ; four rows of long quadrangular cells on one side ; the op- 

 posite side striated. 



Ref. Goldfuss Petref. p. 217- Taf. LXIV. f. 15. 



Formation and localities in England. Wenlock Limestone, Lincoln Hilly Coalbrook Dale, 

 Dudley. 



Foreign locality and authority. Eifel, Goldfuss. 

 Horn era, Lamouroux. 



Hornera crassa, sp. n. Lons. PI. 15. f. 13, 13 a cellular surface nat. size and magnified thrice. 



H. Branches short, thick, flat, dichotomosed ; opening of the cells large, elevated, and irre- 

 gularly disposed on one side; opposite side striated; internal structure not ascertained. 

 Formation and locality. Wenlock Limestone, Dudley. 



Fenestella, Miller. 



Professor Phillips having informed me that the late Mr. Miller of Bristol employed the word 

 Fenestella to distinguish a mountain limestone coral possessing generic characters similar to 

 those of the fossils represented PI. 15. f. 15 to 19, I have conceived it my duty to adopt the 

 name, though not published ; and I have ventured to call one of the species Fenestella Milleri, 

 as a tribute of respect to departed talent. 



Gen. Char. — A stony coral, fixed at the base (f. 15, 15*.) and composed of branches which 

 unite by growth and form a cup (f. 15 to 15 c). Externally the branches anastomose (f. 19.), 

 or regularly bifurcate (f. 15, 16, 17, 18.) ; internally they form a net- work, the intervals being 

 generally oval (f. 15, 18 c). One row of pores on each side of the branches externally, the 

 openings being circular and projecting when perfect (f. 16 a, &c). The branches, when re- 

 gularly bifurcated, are connected by distant, transverse processes, in which no projecting pores 

 are visible (f. 16«). In well-preserved specimens of the base of apparently old corals, the 



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