454 ZOOPHYTES. 



calicles stand out very prominent, though much compressed, and 

 sometimes range in longitudinal series; the striatures are very fine 

 and minutely echinulate. The aperture of the cell is oblong and 

 opens upward. 



20. MADREPORA DIGITIFERA. (Dana.) 



M. late cespitosa, planiuscula, frondis basi solidd et disciformi; supra 

 ramulis creberrimis digitiformibus, viz teretibus et subacutis, 2J-3" 

 longis et 4-5'" crassis, scepe breviter proliferis. Corallum caliculo 

 apicali prominulo, vix 1"' lato; lateralibus, confertis, divaricatis et 

 dimidiatis, non compressis, erectis, |'" longis, labio subcrasso, cellis 

 immersis spar sis, Stella breviter 6-radiatd, lamella exteriore promi- 

 nente. 



Broad, nearly flat above, base of the frond solid and disk-form; above, 

 branchlets crowded, digitiform, scarcely terete, and subacute, 2i to 

 3 inches long and 4 to 5 lines thick, often short proliferous. Co- 

 rallum with the apical calicle a little prominent, scarcely a line 

 broad ; the lateral crowded, divaricate, dimidiate, erect, and not at 

 all compressed, ^ of a line long, lip rather thick, with some scat- 

 tered immersed cells ; star short 6-rayed, exterior lamella quite 

 prominent. 



The corallum of this species has a solid circular base like the pre- 

 ceding ; but the dimidiate calicles are not nariform, nor at all com- 

 pressed, and they stand erect upon the branchlet, so that the under 

 side is at right angles with it : they are neatly striate, and the striaB 

 are nearly entire. There are some immersed cells, and about the 

 lower part of the branchlets (as also in the preceding species) all the 

 calicles are obsolescent. The branchlets are crowded together, with 

 intervals only of a sixth of an inch. The specimen seen by the 

 author belonged to the Boston Natural History Society : the locality is 

 not known. 



21. MADREPORA GLOBICEPS. (Dana.} 

 M. late cespitosa, supernc convexa, basi solida et disciformis, supra, ra- 



