BULLETIN 59, UNITED STATES NATIONAI. MUSEUM. 49 



Genus FLABELLUM Lesson. 



FLABELLUM PAVONINUM Lesson. 



Plate r, figs. 1, 1-7, 1'), 2, 2a, 2/*, :^, -.in; Plat.- II, fi-js. 1, la, 2, 2a, 26, .S, 3a, 4, 4a, 5, .'Ja; Plate III, 

 figs. 1, 2, 3, 4, 4a, ih. 



1H31. Flabellum paroninmn Lesson, Ilhist. Zool., pi. xiv. 



184(5. Euphiill'm pavonina Dana, Zooi^li. Wilkes l'",xpl. Exped., p. 159, pi. vi, figs. 5, 6. 



1848. Flabellum pamninum Milne Kdwakds and Haime, Ann. Sci. Nat., 3i6ine si-r., Zool., IX, 



p. 260. 

 1848. Flahelhuii dhliwtuin Milne ICdwaeids and Haime, Ann. Sci. Nat., 3i(ime si't., Zool., IX, 



p. 262. 

 1857. Flahellum pnvoiiiyium Milne Kowauds and Haime, Hist. Nat. Corall., II, p. 80. 

 1857. Flahellum diMlnrtnm Milne Kd\v.\ki>s and Haime, Hist. Nat. Corall., II, p. 80. 

 1873. Flabellum diftiiictam Duncan, Trans. Zool. Soc. London, VIII, p. 322, pi. .xxxix, figs. 1-13. 

 1878. Flabellum latum Studer, Monatsber. Akad. Wissenschaft., Berlin for 1877, p. 630, pi. i, 



figs. 3a, 36. 

 ISSl. Flabellum patens Moselev, Deep Sea Corals, Challenger Repts., p. 172, pi. vi, figs. 4, 4a, 



5, 5o. 

 1881. Flabellum australe Moseley, Deep Sea Corals, Challenger Repts.. p. 173, pi. vii, figs. 4, 



4a, 5, 5a, 56. 

 1894. Flabellum paripatmninum Alcock, .lour. As. Soc. Bengal, LXlll, ]i. 187. 

 1.S9S. Flabellum paripavoninnm Alcock, "Investigator" Deep Sea Madrepor., p. 21, pi. ii, figs. 3, 



3a, 36. 

 1902. Flabellum distinctuni Alcock, Deep Sea Madrp|)or., Siboga Exped., p. 30. 

 1902. Flahellum lamellulosum Alcock, Deep Sea Madrepor.. Siboga Exped., p. 30, pi. iv, figs. 



28, 28a, 286. 

 1902. Flabellum australe Alcock, Deep Sea Madrepor., Siboga Exped., ]i. 30. 

 1902. Flabellum latum Alcock, Deep Sea Madrepor., Siboga Exped., p. 31. 

 1902. Flahellum paioninum G.\rdiner, Marine Invest, in South Africa, II, ])p. 123, 124, pi. iv, 



figs. 18-21 (with Synonymy). 

 1904. Flabellum chunii v. Marenzeller, Steinkorallen, Valdivia Exped., p. 274, |il, xviii, figs. 



14, 14a, 146. 



The species deserilicd by von Marenzeller under the iiiinie of F. magmjicum" 

 is close to F. pavoidnum, but is nuich larger. Height, 6.5 mm. ; greater diameter, 93 

 mm.; lesser, 47. The proportions, however, are quite similar to those of typical 

 pavoninum. The number of septa {'2.V2) is, for the size, proportionately less than in 

 F. pavoninum. 



Description. — Corallum cuneiform, base conipres.sed, rising above a medially 

 situated, rather slender, pedicel. Large individuals attain a height of 50 to 60 mm. 

 Faces convex, plane or concave, their angle of divergence from 30"^ to 55'-'. Lateral 

 edges acute and crested, acute but not crested, or obtusely rounded, the angle of diver- 

 gence from 70° to 200^^ or more. Costie varial)le in development, absent, subob.solete, 

 or moderately developed. Margins of the calice rounded, nevei- scalloped, inci,sed,or 

 lobed; they may arch l)eyond the curve of a half circle or iua\- be depressed below such 

 a curve. Septa between 5 and 7 cycles, with from 24 to a little more than 50 princi- 

 pals: the usual arrangement is for every fourth or every eightii septum to reach the 

 columella, with intermediate lengths according to the cycle. The upper portions 

 of the septal margins may reach the level of the upper edge of the wall, ))ut they do 



oSteinkorallen, Valdivia Exped., p. 276, pi. xvii, figs. 13, 13a. 



32301—07 1 



