102 PEOCEEDINGS OP THE NATIONAL, MUSEUM vol.83 



saivkinsi, except that 4 to 8 of them may be lacking in some calices. 

 They are short, tapering rapidly from a considerable thickness at 

 the wall to a fine inner edge. Those of the first cycle are equal 

 and free and end in a crown of pali around the columella. The sec- 

 ond cycle is joined near the inner ends by the third cycle and ter- 

 minates in a second crown of pali just outside the first. The 

 columella is a small columnar style in the center of the corallite. 



Ty^e.— U.S.N.M. no. 44295. 



OccutTence. — In the Yellow limestone in the Cambridge district, 

 Jamaica (Trechmann collection). 



ReTTiarks. — This species is distinguished from A. sawkhisi, with 

 which it occurs, by its smaller corallites, by the narrow space around 

 the corallites, and by the subnormal number of septa in many of the 

 corallites. Its branching rather than massive growth-form is also 

 a distinction. 



Genus ASTREOPORA Blainville, 1830 



ASTREOPORA WALLI, new species 



Plate 4, Figure 13 



Description. — Corallum forming branches, which may be more or 

 less palmate in form. Palmate portions about 10 mm thick. The 

 basal part of one branch measures about 11 by 21 mm. The calices 

 are not preserved in the specimens. The corallites are cylindrical or 

 slightly compressed, averaging 1 mm in diameter, spaced about 0.3 

 mm apart. The septa are usually 6 in number, but a fcAv rudi- 

 mentary ones may also be developed. They are short, rarely extend- 

 ing more than halfway to the center of the corallite. At the periph- 

 ery they are expanded to form the corallite wall, which is irregularly 

 perforate. Septo-costae are present, corresponding to the septa, but 

 not much developed and nonconfluent. There is no columella. 

 Uniting the corallites are numerous irregular perforate tabulae 

 forming a loose coenenchyme. 



Type.—U.^.'^M. no. 44296. 



Occurrence. — In the Yellow limestone in the Cambridge district, 

 Jamaica (Trechmann collection). 



Reinarks. — This is the first species of Astrcopora to be described 

 from the Eocene of the West Indian region, although several have 

 been noted from the Oligocene by Vaughan. It is distinguished 

 from these later species by the smaller size of the corallites Ughter 

 coenenchyme, and lack of a columella. 



