556 Mr. H. N. Moseley on the true 



stripes of yellowish red and pale grey. This coral was dredged twice in 

 the neighbourhood of the Azores from 1000 fathoms ; five specimens, 

 three living and two dead, were obtained. 



Flabellum apertuM, sp. n. 



The corallum is much compressed at the base, where it forms a short 

 pedicle, which is attached in one specimen to a minute rolled particle of 

 basalt. Above the pedicle the walls of the corallum curve outwards, so 

 as to form a widely open, almost cup-shaped calicle. The summits of 

 the calicle at the termination of the long axis are a little lower than 

 those at the termination of the short axis. The wall of the calicle 

 presents twelve prominent costal ridges separated by intervening 

 rounded excavations. The primary ridges are more marked than the 

 secondary, and the lateral costal slightly more prominent than the others, 

 and continued almost to the apex of the pedicle. The surface of the 

 wall and costal ridges is smooth, and covered with a glistening epitheca. 

 The margin of the calicle is deeply and irregularly dentate, with sharply 

 angular prominences corresponding to the primary and secondary eostae. 

 The septal arrangement is remarkable for its simplicity and symmetry 

 as occurring in a Flabellum. There are four cycles of septa in six 

 systems, and these are present in every specimen obtained without any 

 irregularity, the systems being all of the same breadth. The columella 

 is little developed, and composed of scanty outgrowths from the inner 

 ends of the septa. 



Extreme height of the largest specimen 2 centims. ; longer axis of the 

 calicle 3*4 centims., shorter axis 2*3 centims. 



The mean proportion of the axes of the series is about 100 to 137. 

 This Flabellum has a wide range, having been obtained by us off the 

 coast of Portugal, and also oif Prince-Edward Island in the South Indian 

 Ocean, in 900 and 310 fathoms respectively. 



Flabellum angular e, sp. n. 



The corallum is thin and fragile and of a pearly white, covered 

 externally with a glistening pellicular epitheca. The calicle is vase- 

 shaped, widely open, the diverging walls making with one another an 

 angle of about 110°. A short cylindrical pedicle is present. The mouth 

 of the calicle is even and pentagonal in outline ; from each angle of 

 the pentagon a stout costal ridge, very slightly dentate, runs down to 

 the pedicle. Between these costse the wall of the calicle presents five 

 faces, almost flat, but with slightly marked secondary costse. The septa 

 are in five systems and four cycles ; they consist of extremely fragile 

 lamina) covered with granules on their faces. The septa are complete, 

 except the quaternary, which reach to a very short distance only from 

 the calicular margin. The columella is well developed and trabecular, 

 formed of outgrowths of the inner ends of the septa; it is deeply 



