CORALS FROM THE TRECHMANN AND MATLEY COLLECTIONS- 

 FROM THE MIDDLE EOCENE YELLOW LIMESTONE OF JAMAICA 



Family SERIATOPORIDAE Milne Edwards and Haime 

 Genus STYLOPHORA Schweigger, 1819 



STYLOPHORA CAMBRIDGENSIS, new species 



Plate 4, Figures 3, 4 



Description. — Corallum branching, basal portion unknown. 

 Branches small, compressed or cylindrical. Calices small, superfi- 

 cial, ranging in diameter from 0.75 mm in the younger ones to 1 mm 

 in older calices, spaced 0.25 to 0.5 mm apart. Septa, 12 in number,, 

 the six primaries distinct, well developed, extending to the columella, 

 equal in size, and often exsert above the calicular margins; second- 

 aries very short or rudimentary, present as mere ridges in the 

 younger corallites. The columella is small, styliform, tubercular, not 

 attaining the same height as the upper margins of the primary septa. 

 The coenenchyme is dense, its surface covered with small tubercular 

 granulations, which may be so arranged as to form an indistinct 

 median ridge. The size of the branches varies from a diameter of 

 6.5 mm, in the more cylindrical ones, to 6 by 10 and 9 by 11 mm, in 

 the more compressed ones. 



Type.—\].S.'^M. no. 44283. 



OcGwn^ence. — The five specimens come from the Yellow limestone 

 in the Cambridge district (Trechmann collection). 



Remarks. — This species is closely related to S. compressa Duncan 

 (1873, p. 551), a species occurring in the upper Eocene of St. Bar- 

 tholomew, and may be possibly only a variety, but the more closely 

 set, nonsalient calices, separated by a more strongly granular coenen- 

 chyme with a faint median ridge, appear sufficient to separate this 

 Jamaican form. 



Duncan (1865, p. 8) identified a Stylophora from the Richmond 

 beds of Port Maria with S. contorta (Leymerie), a European species, 

 which might be the same as the present species, but it is certainly 

 not identical with Leymerie's species as it is described by Milne 

 Edwards and Haime (1857, p. 135). Duncan's specimen might also 

 be identical with our Stylophora species a, which comes from the 

 same horizon at the same locality. 



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