516 Verrill, N^otes on Radiata. 



Allopora Ehrenberg. 



AUopora Ehr., Corall. rothen Meeres, p. 147, 1834; {pars) Dana, Zooph., p. 697; 

 Edw. and Haime, CoraU., ii, p. 131. 



Corallum encrusting, irregularly lohed, or branching, Coenenchyma 

 abundant, compact, the surface finely granulous, with more or less 

 numerous, scattered ampullaj or vesicles. Cells small, irregularly 

 arranged, scattered. Septa narrow, not exsert, usually five to ten 

 larger, equal, thickened ones, which generally imite by their inner 

 edges below, so as to enclose the intervening small chambers, within 

 which may usually be seen rudimentary septa of the last cycle, in the 

 form of small ascending points or papillie. Columella conical or 

 rounded, finely spinulose or hirsute. 



Allopora Californica VerriU. 



Proceedings Essex Institute, vol. iii, p. 37, 1866, {non Pourtales). 

 Plate 10, figure 8. 



Corallum encrusting at base, rising into thick, irregularly lobed or 

 palmate branches, three inches or more high, some of which are two 

 inches broad and nearly half an inch thick ; some are nearly round 

 and rapidly tapering, of about the same thickness as the others. 

 Many of the branches have an annelid tube, with two apertures side 

 by side, in the center, and appear to be due to the encrusting habit of 

 the coral, which covers the tubes with a thickness of from an eighth to 

 a fourth of an inch, and in this way may rise into false branches. 

 The worm tubes themselves are quite thin, forming a delicate sep- 

 arable lining for the tubes formed by the coral. Some of the branches 

 subdivide into two or three parts near the end, which spread nearly 

 at right angles. Cells very small, about *02 of an inch, quite irregu- 

 larly scattered over the whole surface ; distance between them equal 

 to two or three times the diameter, or from '04 to '07 of an inch. Coen- 

 enchyma compact, with a minutely granulous surface, appearing 

 smooth to the unaided eye, but having a few minute papillae or minute 

 vesicular ampullae, some of which are open at top, forming small pores 

 scattered between the cells. In a longitudinal section the cells are 

 seen to be filled up below, and between them there are irregularly 

 scattered, minute, rounded cavities, caused by the superficial papillae 

 or vesicles. Septa represented commonly by six thick triangular pro- 

 cesses which converge toward the center of the cells, leaving only 

 narrow, radiating spaces between them ; in other cells the number 

 varies from five to eight. The septa project slightly above the com- 

 mon surface, and do not reach more than half way to the center of 



