Verrill, Notes on BacUata. 505 



ing to the columella, varying in number from 10 to 24, commonly 15 

 to 18, the edge lacerate, the sides roughly granulous. Pali 5 to 12, 

 small but prominent, roughly spinulose or granulous. Columella 

 little developed, trabicular, frequently wanting. Color of unljleached 

 coral dull brownish yellow. 



Diameter 8 inches ; height 4 ; diameter of cells -05 to -06 of an inch. 



Pearl Islands, 4 to 6 tathoms, by divers, two specimens, — F. II. 

 Bradley, 



The large, deep, regular cells readily distinguish this species from 

 the others here described. There is no very closely allied Atlantic 

 species. The increased number of septa is a very remarkable 

 character. 



Porites Panamensis Verriii. 



Proceedings Boston Soc. Nat. Hist., vol. x, p. 329, 186G 



Corallum encrusting, usually forming broad, rather thin, somewhat 

 convex, irregular, uneven masses; sometimes completely surrounding 

 small pebbles and thus becoming sub-globular. I'olyp-cells small, 

 crowded, a little excavate, rather shallow, but very distinct, separated 

 by rather thin, roughly granulous, porous, but firm, walls. Septa 

 mostly r_', well developed, narrowed and somewhat thickened out- 

 wardly, the sides very thickly covered with coarse, rough, lacerate 

 granules, the edge also rough and lacerate. Pali small and rather 

 stout, roughly lacerately granulous. Columella small, inconspicuous, 

 often wanting. Color of unbleached coral dark ash-brown. 



Polyps when expanded exsert, with twelve equal, cylindrical, light 

 brown tentacles, not swollen at the tips, which are white, — F. H. B. 



Diameter of the lai'ger masses 4 to 6 inches; thickness '5 to 1"5 ; 

 diameter of polyp-cells about 'OS of an inch. 



Panama and Pearl Islands, in rocky pools and in patches over the 

 bottom just below low-water mark, — F. H. Bradley. 



Easily distinguished by the small cells and very rough walls and 

 septa. 



Porites nodulosa VerriU, sp. nov. 



Corallum much subdivided into small, short, crowded, and fre- 

 quently coalescent branches, which are rounded and usually not 

 much longer than thick, and form low, crowded clumps. Cells 

 moderately large, shallow, but clearly defined, separated by thin, 

 roughly lacerate and porous walls. Septa usually twelve, roughly 

 lacerate and spinulose, the sides covered with sharp, rough granules. 



