21 



viii. FLABELLUM, Less., Edw. & H., Martin Duncan. 



14. Flabellum paripavoninum, Alcock. PL ii. figs. 3, Ba-b. 



Flabellum paripavoninum, Alcock, Jonrn. As. Soo. Bengal, Vol. LXIII. pt. 2, 1894, p. 187. 



Corallum compressed, fan-shaped, with a sessile scar of attachment but no 

 pedicle, and with the two faces somewhat concave. 



The lateral costae are sharp but not salient, they meet the basal scar at an 

 angle of about 45 degrees : the other costae are merely sinuous striations. 



The margin of the calicle is almost entire, and forms a segment of a circle 

 of about 230 degrees ; so that when the corallum is held straight in front of 

 the eyes, with the major axis end on, and without any inclination, the colu- 

 mella such as it is is plainly visible above that plane of the calicular margin. 



The septa are in six cycles, the last cycle not quite complete ; they are all 

 extremely thin, and have the free edges sharp and straight (not sinuous) and 

 the granular strife of the surface inconspicuous. Those of the first three cycles 

 are almost equal and meet together at the bottom of the calicle to form a sort 

 of columella by their slightly-thickened ends. Those of the fourth cycle are 

 not so very much smaller than their predecessors, but do not meet them. 

 Those of the last two cycles are small. 



Colour of corallum, pale madder, the septa gradually becoming almost 

 white. 



Off Pedro Bank (Laccadive Sea) 636 fms. 



Height of corallum 39 millim. ; major axis of calicular orifice, 37*5 ; minor 

 axis, owing to the eversion of the rim of the calicle, 30*5 millim. 



Judging from Lesson's figure (Illustr. de Zool. pi. xiv.) and Dana's des- 

 cription and figures (U. S. Expl. Exp., Zoophytes, p. 159, pi. vi. figs. 5, 6, 6a) 

 this species is distinct from Flabellum pavoninum which has a pedicle, and 

 sinuous septa, the first four cycles of which are equal. At any rate, it is quite 

 as distinct from that species as Flabellum distinct-urn Edw. and H. is. 



15. Flabellum laciniatum (Phil.) Edw. & H. PL ii. figs. 4, 4. 



Phyllodes laciniatum, Philippi Neues Jahrb. f. Mineral. Geol. etc., Stuttgart, IX. 1841, p. 665, pi. xi. fig. B 2. 



Flabellum laciniatum, Edwards and Haime, Ann. Sci. Nat., Zool., ser. 3, IX. 1848, p. 273 : Hist. Nat. Cor;ill 

 11.98. 



Flabellum laciniatum, Seguenza, Mem. Accad. Sci. Torino, ser. 2, XXI. 1864, p. 485, pi. x. fig. 7. 



F labellum laciniatum, Duncan, Proo. Roy. Soo. XVIII.. 1870, p. 293 : Trans. Zool. Soo. VIII. 1874, p. 323, pi. 

 xxxix. figs. 11, 14-18. 



Flabellum laciniatnm, Lindstrom, Svensk. Ak. Handl. XTV. pt. ii. 1876, No. 6, p. 12. 



Flabellum laciniatum, Wood-Mason and Alcock, Ann. Mag. Nat. Hist., Dec. 1891, p. 450, fig. 15. 



Corallum extremely thin and fragile, elegantly fan-shaped with a well- 

 defined but short scar-like pedicle, the calicular margin deeply cut into twelve 



