82 PEOr. p. MARTIN" DUFCAN's EETISION or THE 



cylindroid, covered witli a well-developed complete epitheca. The 

 calices are circular in outline and rather deep. Septa not nume- 

 rous. The columella is rudimentary or absent. Endotheca not 

 abundant. 



Distribution. — Fossil. Trias, Jurassic: Europe. Jurassic: 

 England. 



This was formerly a genus, but it is clearly only a division of 

 that called Thecosmilia. 



The genus Coenotlieca, Quenst,, is ill defined, and relates, in all 

 probability, to peduncles of Thecosmilioida. 



III. Alliance MUSSx40IDA. 



CEespitose Astrseidse with very dentated or spined septa. Growth by 

 fissiparity. CoraUites free at their sides or shghtly joined. Cahces 

 unsymmetrical, rarely solitary, usually in series, free. 



Genus Trachyphyllia, Ed. & H. 

 Genus Muss A, Oken. 



Genus Trachyphyllia, Milne-Echoards Sf Jules Haime, Hist. 

 .Nat. des Gorall. vol. ii. p. 340 (1857). 



Colony fixed, not very tall, composed of corallites which are free 

 amongst themselves, wavy and swollen and contracted here and 

 there. Calices as long valleys, much twisted and deep. Colu- 

 mella well developed, spongy, and lax. Septa numerous, exsert, 

 striated, and highly granular on their sides ; the free edge of the 

 larger finely dentate, and lobed towards the columella, and the 

 smaller have larger and narrower dentations. Endotheca exists. 

 The wall has costa, which are strong, echinulate, and sublamellar. 

 Epitheca rudimentary or incomplete. 



Distrihution. — decent. Chinese, Indian, and Eed Seas. 



This gemi&=Manicina, according to Dana, Zooph. 1846, pi. 9. 

 fig. 1. 



Genus Mussa, OTcen, 1815, amended in Milne-Edwards ^ Jules 

 Saime's Hist. Nat. des Gorall. vol. ii. p. 328 (1857). 



The colony is tall, more or less csespitose. The corallites are 

 united in short or long series, or free, and have the walls either 

 quite ununited or very slightly united. Calices serial or circum- 

 scribed, unsymmetrical, and their centres are distinct and deep. 

 The columella is spongy and well developed. The septa large, 



