114 Leuckart: Bericht üb d. Leist. in d. Naturgeschichte 



In'divm niarfiinatujn Lesnenv (der amerikanische Repräsentant von M. 

 dianthus), Cereus sol Charleston (nahe mit C. beUis verwandt). 



Zur Charakteristik der neuen Gen. giebt Verf. folgende 

 Diagnose : 



Stylatula Verr. Elongated, slender, nearly cylindrical; near 

 the base naked, bulbous at the end. Pinnae short, supported by 

 numerous strong radiating spines, the polypes clustered on their 

 Upper surface. Axis sub-cylindrical, extending through nearly the 

 whole length. 



tarisis Verr. Corallum irregularly br an ching, nearly in a 

 plane. The axis consists alternately of calcareous and suberous 

 Segments, of uniform thickness, traversed by numerous narrow sul- 

 cations. The branches originate from the calcareous segments. 

 Coenenchyma persistent, rather thin, somewhat membranous, with 

 a rough surface. Cells prominent, arranged irregularly on all sides 

 of the branchlets, but öfter absent on the median surfaces of the 

 larger branches. 



Ti t anideum Ag. Closely allied to Briareum, but has a 

 more distinct axis, which is spongy and very spiculose, but firm 

 and less porous than that of the latter. The cells are scattered on 

 all sides and not prominent. 



Synaraea Verr. (= Porites p. p.). Corallum irregularly 

 branched or glomerate. Cells without distinct walls, the septa ru- 

 dimentary; six prominent paliform lobes Surround the central ca- 

 vity, which has a rudimentary or very small, tubercular columella; 

 outside of the pali are other similar points or granulations, scat- 

 tered between the cells, which are not distinctly circumscribed, but 

 öfter separated for some distance by a porous coenenchyma. 



Trachyp ora Verr. Corallum explanate, thin; below echi- 

 nate and coarsely costate; above with scattered polyp centres de- 

 stitute of walls, with one or two cycles of septa, radiating at the 

 centres, but becoming subparallel between them, as in Halomitra, 

 strongely dentate or lacerately lobed, the strongest lobes surroun- 

 ding the polyp centres ; columella loose, trabicular. 



Acanthopora Verr. Corallum ramose, solid, the cells being 

 filled below as in Oculina. Costae between the cells represented 

 by series of spines. It differs also from Echinopora in its polyp. 



Clavarina Verr. Corallum compact, branching. Cells im- 

 perfectly circumscribed, but not confounded in series. Septa and 

 walls thickened, the former lacerate-toothed, with paliform teeth at 

 the bases. Columella rudimentary. 



Aulactinia Ag. Column elongated, upper portion capable 



