34 PROP. p. MARTIN DlJIirCAlS-'S REYISION 01" THE 



G-ernis CcENOCTATHUS, MM. Milne-Edwards 8f Jules Raime, 

 Ann. des Sci. Nat. 3^ ser. t. ix. p. 299 (1848). 



Colony "busli-sliaped, more or less ramified ; corallites long, 

 conico-cylindrical ; calices circular, deep. Columella small, and 

 consists of a few twisted processes. Pali in one crown. "Wall 

 thick and smooth, or granular or costulate. 



Distribution. — Fossil. Oligocene, Miocene, Pliocene : EuBope. — 

 Recent. Mediterranean. 



Grenus Gemmulatrochtjs, Duncan, Madrep. of Deep Sea, Trans. 

 Zool. Soc. vol. X. pt. 5, p. 243 (1878), amended. 



Colony small and bush-shaped. Parent conico-cylindrical, with 

 a broad adherent base. Calice deepj columella rudimentary. 

 Septa stout, not reaching far inwards. Costee hidden by a well- 

 developed epitheca. Buds ascend in growth, and join others by 

 their epitheca. 



Distribution. — JRecent. Northern shores of the Mediterranean, 

 littoral. 



3. Subfam. Turbinolidce reptantes. 



The corallites of the colony grow from an expansion of the 

 basal structures of the parent or assemblage. There is no endo- 

 theca, and the septa are plain. 



The forms thus differentiated represent the Astrangiacese of 

 MM. Milne-Edwards and Jules Haiine of their group Astraeacese. 



Genus Poltctathtjs, Duncan, Froc. Zool. Soc. 1876, p. 433, 

 amended. 



Colony of close or rather distant corallites, cylindro-conical in 

 shape. Calicular margin wavy or angular. Septa irregular, 

 exsert. Pali before the secondaries and tertiaries larger than the 

 ends of the small septa, bilobed or not. Columella deeply seated, 

 small, papillary or spinulose. Cost® subequal, granular.- Epi- 

 theca well developed. 



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



Subgenus Agelecxathus, (genus) Duncan^ Froc. Zool. Soc. 



1876, p. 434. 

 There is no epitheca. The costae are well developed. The 

 colony incrusts, or the stoloniferous expansions are large. 

 Distribution. — Fecent. St. Helena and Persian Gulf. 

 This subgenus is taken from the geuus Agelecya'thus, nobis. 



