310 BULLETIN 103, UNITED STATES NATIONAL MUSEUM. 



smaller knot with no corresponding septum usually occurs between 

 each pair of larger knots. 



Columella, a distinct, round, moderately prominent style, very 

 slightly compressed in the directive plane. 



Coenenchymal surface roughly granulated, from 1 to 4 rows of 

 granules between calices, depending on their distance apart. 



Localities and geologic occurrence. — Canal Zone, in the Emperador 

 limestone at stations, 6016, quarry, Empire; 6024&, lower end of cul- 

 vert, Panama Railroad (relocated line), on Rio Agua Salud in the 

 upper bed, collected by T. W. Vaughan and D. F. MacDonald. 



Ootypes.—No. 324769, 324770, U.S.N.M. (7 specimens). 



Of other species of Stylophora with which I am acquainted S. mac- 

 donaldi seems to resemble most S. granulata Duncan from Bowden, 

 Jamaica. S. granulata has deeper calices, less developed secondary 

 septa, and in some specimens the upper lip of the calices is more 

 prominent than the lower. 



STYLOPHORA GRANULATA Duncan. 



1864. Stylophora granulata Duncan, Geol. Soc. London Quart. Jour., vol. 21, 



p. 10, pi. 2, fig. 3. 

 1867. Stylophora granulata Duncan, Geol. Soc. London Quart. Jour., vol. 24,. 



p. 25. 

 1873. Stylophora granulata Duncan, Geol. Soc. London Quart. Jour., vol. 29, 



p. 551. 



Original description. — "The corallum is ramose; the branches are 

 nearly cylindrical, often flattened on one side, and leave the stem at 

 an acute angle. The calices are placed irregularly, and are separated 

 by a coenenchyma, which is sharply granular, and which has very 

 rarely any grooves or continuous ridges on its surface. The calices 

 are circular, not inclined, very deep, and are surrounded by a raised 

 ring formed by the septa and costae. The columella is situated 

 deeply; it is cylindrical below, and sharp where free, but it does not 

 reach the level of the calicular margin; it is delicate, and six large 

 septa are attached to it low down. The septa are in two sets. The 

 superficial septa are from eighteen to twenty in number; six are con- 

 tinuous with the large septa, and the rest taper finely internally and 

 externally, the spindle-shaped process being one-naif septum and the 

 rest costa. The processes are close, radiate, and horizontal. Diam- 

 eter of calices, one-thirtieth inch [0.8 mm.]. 



"Localities: Bowden and Vere, Jamaica." 



Duacan, in 1873, cites this species from St. Bartholomew, but this, 

 I am convinced, is an erroneous identification. 



There are two small broken branches of this species in the collec- 

 tion of Mr. T. H. Aldrich, obtained at Bowden, Jamaica, and pre- 

 sented to the United States National Museum. 



