FAMILIES ANT) GENERA OE THE MADEEPOEAEIA. 43 



on the stem, more or less spirally placed on tlie branclilets, 

 superficial and circular. Columella solid, with a solitary styli- 

 form tubercle. Septa crenulated and stout ; some of the smaller 

 septa unite, and before them are pali or paliform lobes. Costse 

 well marked, radiating and often uniting with those of other 

 calices. 



Distribution. — Fossil. Cretaceous : Europe, England. 



Grenus Trtmohelia, Milne-Edwards Sf Jules JEaime, Comptes 

 Bend, de VAcad. des Sci. t. xxix. p. 68 (1849). 



Colony dendroid. Calices arranged in more or less spiral lines, 

 shallow, and with a low margin. There is no columella. Septa 

 thick externally, subentire at the free edge. Pali before the 

 primaries and secondaries, and these last the largest ; they unite 

 laterally to form a vertical tube with thick walls, which fills up 

 below. Costae equal and in striations, which are directed towards 

 the base of the colony. Coenenchyma greatly developed, granular. 



Distribution. — Fossil. Miocene : Europe. Recent. Pacific. 



Grenus SciiEEOHELiA, MUne-Edwards Sf Jules JIaime, Ann. des 

 Sci. Nat. 3^ ser. t. xiii, p. 75 (1850) ; P. Martin Dimcan, 

 Froc. Zool. Soc. Lond. 1876, p. 437. 

 Colony dendroid, branches often coalescing, incrusting often 

 at first. Calices circular, immersed or slightly prominent on 

 the stem, or projecting and gemmating, situated irregularly 

 on the numerous terminal branchlets. Ccenenchyma well deve- 

 loped on the stems, glistening or very minutely granular, marked 

 but little by costal striae. Columella solid in three or many 

 lobes, often consolidated together. Septa well developed, sub- 

 entire, laterally granular, unequal. Pali moderately developed 

 and placed before the secondary septa, often irregular. Dis- 

 sepiments occur. 

 Distribution. — Recent. South Atlantic, St. Helena. 



Genus Bathelia, Moseley, Report on ' Challenger ' Corals, 

 p. 177, pi. viii. figs. 1-6 (1881). 



Colony arborescent; calices disposed alternately in nearly 

 straight rows on either sides of the several branches, with very 

 prominent margins. Ccenenchyma white, compact, and dense, 

 with its surface covered entirely by curved striae continuous with 



