508 Verrill, Notes on Radiata. 



None of the septa unite together withm, so far as can be seen from 

 the surface, but those of the fourth and fifth cycles are slightly bent. 

 Columella well developed, with a regular convex surface, composed of 

 a fine, spongy tissue. Color of the unbleached coral nearly black. 



Height 3 inches; breadth 5*25. 



Pearl Islands, Bay of Panama, brouglit from six to eight fathoms 

 by divers, — F. H. Bradley. 



Dendrophyllia tenuilamellosa Verrill. 



Coenopsammia tenuilamellosa Edw. and Haime, Annals des Sci. Nat, vol. x, p. 110, 

 PI. I, fig. 11, 1848 ; CoralUaires, vol. ill, p. 128, 18G0. 



Corallum forming low, rounded, convex clumps, consisting of an 

 aggregation of unequal cylindrical corallites, which are all united 

 together at base in a solid mass, and sometimes partially united 

 laterally. Polyp-cells deep, circular or nearly so, with thin margin. 

 Septa thin, in four cycles, with rudiments of the fifth in some of the 

 larger corallites ; primaries a little broader than secondaries, but 

 similar in form, narrowed toward the summit, nearly or quite reacliing 

 the columella below, the edge nearly entire, the sides smoothish, with 

 lines of small granules. Septa of the third cycle very narrow ; those 

 of the fourth very thin and narrow, the edge divided into slender 

 spinules, they curve toward and join those of the third about midway 

 between the wall and columella ; those of the fifth cycle, when pres- 

 ent, are very small and rudimentary. Columella well developed, a 

 little prominent, occupying about a third of the breadth of the cell, 

 composed of convoluted and cortorted porous plates. Transverse 

 plates between the septa few and distant. Walls thin, porous, with 

 somewhat regular, unequal, rounded costal, which ai'e roughly granu- 

 jous and separated by deep irregularly pitted grooves. Tissue of the 

 basal mass very openly porous and irregularly ribbed and pitted. 

 Color of the unl)leached coral dark brown, or. blackish. 



Height of larger specimens 2 to 2*5 inches ; diameter 2 to 5 ; height 

 of larger corallites '25 to "50 ; diameter '35 to "40 ; depth '25 to '30. 



Panama and Pearl Islands, at and just below low-water mark and 

 in tide-pools, — F. H. Bradley ; La Paz, — J. Pedersen ; Acapulco, — A. 

 Agassiz. 



This is very closely allied to D. sicrcularis, but is a much smaller 

 species. The polyp-cells appear to be never more than half as large. 

 The septa, though about as numeroiis, are not so well developed. 



