FAMILIES A.KD GENEEA OF THE MADEEPORARIA. 



17 



trouble. It was at first placed in the genus Turhinolia, then 

 in GaryopJiyllia, then in Deltocyathus and in a new genus of Mr. 

 "Wood's, Notocyathus^. Fortunately some excellent specimens 

 have lately come to hand, and there is no doubt that the pro- 

 jection of the tertiary septa in front of the secondaries is not a 

 pal us but a paliform lobe. There is a decided columella with 

 nodules upon it. The form Caryophyllia viola, Woods and 

 Duncan, must come under a new genus, Nototrochus. 



Grenus NoTOTEocHrs, gen. nov. 

 Syn. N'otoeyathus, Woods. 



The corallum is cuneiform, compressed, free, with a widely 

 open elliptical calice. Columella formed by the septal ends and 

 by intermediate solid tissue, elongate, more or less lobed or 

 nodular where free. Septa unequal, arched near the margin; 

 primaries longest ; secondaries shorter than tertiaries, joining 

 these last by lateral processes and by inner end also. Tertiaries 

 uniting in front of secondaries, and joining with an offshoot of 

 the columella, which is produced as a paliform lobe. Paliform 

 lobe before primaries also. Gestae vary in length, trifurcating 

 low down, subequal at the calice ; interseptal spaces wide. 



Distribution. — Fossil. Tertiary : Australia, New Zealand. 



Grenus Placoctathtjs, MM. Milne-Edwards ^ Jules Haime, 

 Ann. des Sci. Nat. 3^ ser. t. ix. p. 328 (1848), amended. 



The corallum is simple, free or fixed, pedicellate, or with a 

 broad adherent base. Shape more or less flabellar, curved or 

 straight, compressed. Septa exsert or not. Columella lamellar. 

 Pali in more than one crown, usually only before the penulti- 

 mate and antepenultimate cycles, but occasionally only before 

 the larger septa, and before all the cycles except the last. Costse 

 visible or not ; with or without epitheca. 



Distribution. — Becent. Position unknown. — Fossil. Eocene of 

 Sind, Asia. Miocene of Antilles. 



The genus, as amended, combines all the species of Placo- 

 cyathus very naturally. 



Palasont. of New Zealand (Wellington), Oat. Mus. Greol. Survey Dep. pt. iv. 

 (1880). 



LINN. JOUEN. — ZOOLOaX, YOL. XTIII. 2 



