Ic 



^fr. \V. S. Kent on a new Genax of Miidrcporaria. 121 



The tolhnv'iu^" are the chanicteristics of tlic, new <^eiiu.s (for 

 wlileh I propose tlie iiiuue of Stenohciid), aiaeiulcd hy recent 

 observation : — 



Coralluni (L'ndroid, flahelliform ; surface of the cocnencliyina 

 delicately striate. Calices all turned one waj, jjedunculate, 

 compressed transversely to the axis of their peduncles. Septa 

 equal, scarcely exsert. Columella styliform, deeply immersed. 

 Pali rudimentary. Calicular fossa deep. Increasin,<^ some- 

 what irreg-ularly liy alternate distichal or subdichotomous 



emmation. Ampulla; not essential, dev^eloped to a more or 



ess considerable extent. 



Stenohelia maderensis. 



AUopora madcrensin, J. Y. Jolinsoii, Proc. Zool. Soc. p. 100, figs. 1, 2, 3, 

 p. 197 (1.SG2). 



Corallum tlabellate, the main stem somewhat irre<^ularly 

 and the ultimate ramifications alternate-disticlial or dichoto- 

 mously branching, occasionally, however, as many as three 

 calices orig-inating from the margin of the preceding one. 

 Branches cylindrical, delicately striate, sometimes coalescing, 

 ('alices compressed, transversely ovate, pedunculate, all di- 

 rected the same way, those on the main stem becoming gra- 

 dually obscured by the outgrowth of the cocnenchyma. Septa 

 scarcely exsert, twelve to sixteen in number, projecting but 

 little into the calicular fossa. Calicular fossa very deep, 

 having s})ringing from its bottom a well-developed, stvli- 

 form, pointed, and hirsute columella, surrounding which are 

 traces of rudimentary pali. .VmpulUe present in the shape of 

 rounded elevations of the cfcnenchyma studding the corallum 

 on the opposite side to that on which the calices open, the 

 surfi\ce of these elevations slightly echinulate. Long diameter 

 of the calices measuring from -a'-Q to -^V inch, the shorter 

 averaging one-half of the same. Height of corallum of the 

 single specimen in the British ^Museum 3^ inches. Colour of 

 the sclerenehyma pure opaque white. 



Hah. Madeira. 



The foregoing description differs essentially in two points from 

 that given by Mr. Johnson, — in the first place, in the record 

 of a well-developed columella, and, secondly, in that of the 

 presence of ampulla?, both of which characters appear to have 

 been entirely overlooked by the last-named writer. The 

 columella, though deeply immersed and scarcely a])parent, in 

 every instance, to the unassisted eye, is very readily discerni- 

 ble with the aid of the pocket lens, the assistance of a low 

 Ann.d-Mag.N.Hht. Ser. 4. VoIy. 9 



