CORALS FROM THE TRECHMANN AND MATLEY COLLECTIONS FROM 

 THE UPPER CRETACEOUS OF JAMAICA 



Family CARYOPHYLLIIDAE Verrill 

 Genus TROCHOCYATHUS Milne Edwards and Haime, 1848 



TROCHOCYATHUS MATLEYI, new species 



Plate 2, Figures 5, 6 



Desci'iption. — Corallum small, without basal attachment, tro- 

 choid, straight, tapering regularly to the base. Calice shallow, with 

 rounded margin. Wall thin, solid, formed by septal thickening. 

 :Septa slightly exsert, 48 in number, thin, regularly arranged, equal 

 near the wall, but only those of the first two cycles extending to the 

 columella, where they are terminated by a crown of thin, elongate 

 pali. Septa of the third cycle terminating with a crown of pali 

 just outside of the first palar crown. Septa of the fourth cycle 

 very short, extending inward, but a short distance from the wall. 

 Septal margins entire, sides granulate. Columella poorly developed, 

 composed of one or two processes. Dissepiments absent. Costae 

 low, equal, subacute, corresponding to the septa and extending to the 

 base. No epitheca. 



Measurements. — As follows : 



Specimen 



1 (type) 



2 (paratype) 



3 (paratype) 



Height 



Mm 

 3.6 

 4.0 

 4.2 



Calicular 

 diameter 



Mm 

 4.0 

 4.5 

 4.5 



Type.—VS.'^M. no. 74478. 



Occurrence. — In a hard, calcareous, blue concretionary mudstone 

 300 feet below the summit of Blue Mountain Peak, Jamaica (Matley 

 collection). 



Remarks. — This species is distinguished by its small size and need 

 only be compared with T. woolmani Vaughan (1900a, p. 436) 

 from the Upper Cretaceous of New Jersey, a species having an 

 attached corallum and fewer septa. Paracyathus (?) sp. Trechmann 

 is also an attached form and has a larger corallum. 

 74 



