105 



22. Desmophyllum alabastrum n. sp. 



Corallum elongate-goblet-shaped, nearly straight, little compressed, 

 with a stout cylindrical peduncle and an encrusting base. 



There are no costse, but wavy transverse growth-lines are 

 visible in places. 



Septa thin, fiuely granular, in six regular systems and four 

 cycles; but as the septa of the two inferior cycles are very fine 

 and narrow and occur only in the depths of the calice and do 

 not reach anywhere near the calicular margin, there appear to 

 be, at first sight, only two cycles of septa. The septa of the 

 second cycle are narrow, but they extend up to the calicular 

 margin, though they are narrower there than they are in the 

 depths of the fossa. Those of the first cycle alone are large and 

 conspicuous; they are a little exsert, a little unequal in size, and 

 they descend straight to the very bottom of the cup, where 

 they meet. 



Corallum snow-white, the pedicle with a faint cinnamon-brown 

 suffusion. 



Greatest height of corallum 18 millim. 

 Major diameter of calicle 8 » 

 Minor » » » 7 » 



The characteristic feature of the corallum of this species is the 

 burial of the septa of the 3 rd and 4 th cycles in the depths of the 

 cup where at first they escape notice. lts nearest relative seems 

 to be D. simplex Verrill (American Journal of Science and Arts, 

 1870, p. 371) from the West Indies. 



23. Flabellum lamellulosum n. sp. 



Corallum suow-white, of excessively thin and translucent texture, 

 shaped like a widely-stretched fan, its circumference being equal 

 to about 285 degrees of a circle. There is a slender short pedicle, 

 and the lateral costse, which arch outwards and dowmvards, are 

 sharp and finely and irregularly jagged. The two faces of the 

 corallum are slightly concave and moderately everted, are traversed 



