FAMILIES AND GENERA OE THE MADREPOEARIA. 



159 



Genus Trachypoea, Verrill, Bull. Mus. Comp. Zool., Camb. 



Mass., 1864, No. 3, p. 53. 

 Syn. EcMnophyllia, Klunzinger, Corall. des Eoth. Meer. p. 69 

 (1879). 



Colony explanate, thin ; below echinate and coarsely costate ; 

 above with scattered polyp-centres destitute of walls, with one 

 or two cycles of septa radiating at the centres, but becoming 

 subparallel between them, as in Halomitra, strongly dentate or 

 lacerately lobed. The strongest lobes surround the polyp-centres. 

 Columella loose, trabecular. 



Distribution. — Includes Echinopora aspera., Ellis and Solander, 

 of the East Indies. 



Klunzinger places the genus between Halomitra and Myce- 

 dium and JEchinopora. It looks like a Thamnastrsean amongst 

 the Echinoporcd. 



Genus Leptoseris, Milne-Edwards Sf Jules Haime, Hist. Nat. 

 des Corall. vol. iii. p. 76 (1860). 



Colony adherent, in very thin laminso, often folded or irregu- 

 larly twisted, pedunculate or not. Calices not numerous ; a large 

 central one surrounded by small ill-defined but radiating con- 

 centric calices. Septo-costse very long. Columella tubercular. 

 Beneath, the surface is naked and delicately striated. 



Distribution. — Becent. He de Bourbon. — ? Fossil. Eocene: 

 Europe. 



The genus Protoseris, Milne-Edwards & Jules Haime, Brit. 

 Foss. Corals, Oolitic (Pal. Soc. Lond. 1851), p. 103, tab. xx., is 

 clearly closely allied to Lophoseris, Lamarck (1816). The dis- 

 tinction is the papillary columella, for the frondescent shape is 

 found in LopJioseris. In this last genus the columella is tuber- 

 culous or rudimentary. It is interesting to find the genus 

 LopJioseris foreshadowed in the J urassic age. 



Genus Protoseris, Milne-Edwards Sf Jules Haime. 



Colony foliaceous, ascending, folded, and lobed, more or less 

 funnel-shaped. Calices superficial and distant, separated neither 

 by crests nor by ridges. The columella is papillary. The septa 

 are flexuous and confluent. The lower surface of the laminse is 

 costulate and without epitheca. Synapticula exist. 



Distribution. — Fossil. Jurassic : England. 



