FOSSIL CORALS FROM WEST INDIES WELLS 



85 



are slightly thicker than the rest, being almost imperforate and 

 laminar, owing to the filling up of the pores. In mature specimens 

 there are six complete cycles of septa and a good part of the seventh. 

 There is no columella. The synapticulae are well developed, par- 

 ticularly in the lower part of the corallum. 

 Measurements. — As follows : 



rype.— U.S.N.M. no. 74488. 



Oec^Tfence. — All the specimens come from the Providence shales 

 at Providence, near Port Antonio, Jamaica (Trechmann collection). 



Remarks. — This is the first species of this important and wide- 

 spread Cretaceous genus to be noted from the West Indian or North 

 American areas. It groups with G. hemisphaerica Michelin {non 

 Lamarck, 1801)^ of the Senonian of Europe, and is most closely 

 related to C. Ugeriensis Milne Edwards and Haime (Fromentel, 1870, 

 p. 360) from the French Senonian, and from which it may be dis- 

 tinguished by its larger number of septa (about 124 in C. Ugenensis, 

 fide de Fromentel; 192 to 250 in C. jamaicaensis) , coralla of about 

 the same size. 



PARACYCLOSERIS, new genus 



Generic diagnosis. — Corallum simple, free with scar of early at- 

 tachment, depressed-conical to plano-convex in shape, circular in 

 outline, the lower surface covered by a strong, concentrically 

 wrinkled epitheca. Calice shallow or superficial, the latter condi- 

 tion occurring in younger specimens, with an oval or elongate foss- 

 ette. Wall of corallum indistinct. Septa numerous, uniting as in 

 Cyclosens^ trabeculate-fenestrate in structure, usually with the pores 

 well filled, particularly in the larger septa, upper edges marked by 

 strong, almost lacerate teeth. Columella strong, well developed, 

 essential, composed of numerous papillae. Synapticulae present 



2 Millie Edwards and Haime, aware that this species was not identical with Lamarck's 

 species, placed it in the synonymy of C. discoidea (Goldfuss), but Felix, in 1903, pointed 

 out that it does not belong to Goldfuss' species and retained Michelin's name for it. 

 Oppenheim, in 1930, proposed the name C. niichelini for the species. 



