500 BULLETIN 103, UNITED STATES NATIONAL MUSEUM. 



plates. Usually there are six pali; that is, normally there are pali 

 before the lateral pairs, the solitary directive, and the triplet. In a 

 few calices there is a palus before each member of the triplet, making 

 eight pali in all; and in a few calices there is no recognizable palus 

 before the solitary directive, the total number of pali being only five. 

 The pali are solidly fused in the bottom of the calice one to another 

 and to the columella tangle. No columellar tubercle was seen in 

 any calice. 



Locality and geologic occurrence. — Miocene, Cuba, station 3476, marl, 

 Baracoa, collected by T. W. Vaughan (type). 



Miocene, Jamaica, Bowden marl, Bowden, received from Hon. 

 T. H. Aldrich. 



Type.— No. 325069, U.S.N.M. 



There is no other previously described species of Porites, fossil or 

 living, in tropical or subtropical America closely resenbling P. 

 baracoaensis. Superficially it looks like the living P.furcata Lamark 

 or P. divaricata Le Sueur; but the definite mural shelf, above which 

 the wall stands at its distal edge and the special granules on its inner 

 edge, is distinctive. 



PORITES BARACOAENSIS var. MATANZASENSIS, new variety. 



Plate 147, figs. 2, 2a, 3, 4. 



Corallum composed of attenuate branches of small diameter. A 

 fragment 15 mm. long is 3 mm. in diameter at one end and 3.25 mm, 

 in diameter at the other. The maximum diameter of a branch seems 

 to be about 3.75 mm., except where there is some flattening just 

 below a bifurcation. The length of branches exceeds 20 mm., and 

 probably is as much as 40 to 50 mm., or even more. 



Calices polygonal, very shallow or even surficial; diameter from 

 2 to 2.75 mm. Wall slightly elevated, continuous and acute or with 

 knots corresponding to the outer ends of the septa. Usually there is 

 a distinct mural shelf. 



The septal characters are the same as those of P. baracoaensis, ex- 

 cept that the pali are less conspicuous and the septa in the upper half 

 of the calice are usually elongated and have between three and five 

 teeth on their margins between the wall and the columella tangle. 

 But in some calices the upper septa are not produced, and in these 

 the septal characters are the same as in typical P. baracoaensis. Be- 

 cause of the presence of calices presenting the same characters as 

 those of typical P. baraocodensis , a varietal designation seems all that 

 is justifiable. 



Locality and geologic occurrence. — Miocene, Cuba, station 3461, 

 marl, gorge of Yumuri River, Matanzas, collected by T. W. Vaughan. 



Type.— No. 325067a, U.S.N.M. (pi. 147, figs. 2, 2a.). 



