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XI. — The Corals of the Scottish National Antarctic Expedition, By J. Stanley 

 Gardiner, M. A., F.R.S., Professor of Zoology and Comparative Anatomy in the 

 University of Cambridge. Communicated by Dr J. H. Ashworth. 



(MS. received May 14, 1913. Read July 7, 1913. Issued separately September 1, 1913.) 



The collection of Scotia corals is naturally small, since the main work of the Scottish 

 National Antarctic Expedition was in high Southern latitudes, but, during the outward 

 and homeward journeys of the Scotia, collections were made, when opportunity pre- 

 sented itself. 



The species are interesting distributionally, but their soft parts are largely decayed. 

 There are five species, of which one is a known species ; three dead masses, generically 

 determinable ; and the last, a new species, which may in future prove of even greater 

 interest than at the present time. 



Madracis scot las, n. sp. (figs. 1 and 2). 



Colony branching and anastomosing, stems 2-5 mm, in thickness. 



Calicles studding the surface, with no determinable arrangement, rising as distinct 

 flattened cones, the largest varying from '5 to 1"5 mm. high. The surface between is 

 conspicuous, as the cones are generally at least their diameter from one another, and in 

 places two or three times this distance (1-3 mm,) ; it is finely granular. 



Fig. 1. Fig. 2. 



Madraois scotise, n.sp. Fig. 1, Corallum, natural size; fig. 2, Calicle, enlarged. 



The calicular opening varies up to 1*2 mm. in diameter, and is round. Above it 



project the slightly exsert upper edges of the septa ; costse are not distinguishable. 



The septa are 8 in number, and extend as straight partitions to the centre of the 



calicle, where they fuse to the columella, which consists of a single upstanding rod. 



In section, horizontal partitions are seen extending across the interseptal chambers, 

 TRANS. ROY. SOC. EDIN., VOL. XLIX. PART III. (NO. 11). 92 



