23 



specimens of Flabellum laciniatum including a series of over twenty almost 

 perfect specimens varying from 15 millim. to 51 millim. in major diameter 

 and that they show practically no variation ; so that I think Moseley's species is 

 distinct. 



Distribution : Norwegian and North Atlantic Seas (" a common form " 

 Duncan), Indian Seas at 400-600 fms. (a common inhabitant). Fossil : Calabrian 

 and Sicilian Tertiaries. 



16. ? Flabellum laciniatum,, var. 



In the Andaman Sea, 172-303 fms., there was dredged a single small 

 living specimen that resembles Flabellum laciniatum in everything, except that 

 the ten large septa of the first two cycles that spring from the faces of the 

 thecal wall are not sufficiently exsert to cut the calicular margin into the 

 petaloid lobes that are so characteristic of F. laciniatum. The corallum thus 

 looks like that of a F. laciniatum which has had all these lobes broken off, 

 leaving only the wing-like lateral costae and their corresponding septa intact. 



In colour, texture and all other respects it corresponds with F. laciniatum, 

 and except that its pedicle is attached to a small shell, it might, at first sight, 

 be taken for a damaged specimen of that species. 



Major diameter of calicle 26 millim. 



17. Flabellum japonicum, Moseley. 



Flabellum japonicum, Moseley, ' Challenger" Deep Sea Madreporaria, p. 168, pi. vii. figs. 3, 3a, pi. xvi. fig. 12. 

 Flabellum japonicum, Wood-Mason and Alcock, Ann. Mag. Nat. Hist., Deo. 1891, p. 449. 



This also is one of the common inhabitants of the Indian Seas at depths 

 between 400 and 700 fms. It also seems to prefer a muddy bottom. It 

 reaches a large size : in the Indian Museum we have one specimen which 

 measures 3 inches by 2 inches in the diameters of the calicular orifice, and 

 several that approach this size. 



It varies a good deal in shape, in costal sculpture, and in the development 

 of the columella. In young specimens the corallum is wide and shallow, with 

 a distinct pedicle, with the costae of the first two cycles sharply prominent, 

 and the columella loose and comparatively large. 



In old specimens the corallum is somewhat compressed, the calicle is deep, 

 the pedicle is a mere blunt point, the columella is a small plug of dense tissue, 

 and the costse of the first two cycles are either sharply prominent or incon- 

 spicuous. 



Distribution : Japanese and Indian Seas at about 400 fms. 



