CORALS FROM 'THE SILURIAN FORMATION. 295 
Corallum massive, subgibbose; epitheca thin. Calicinal circles small, and circum- 
scribing a shallow, but well marked central fossula. Costo-septal radii very delicate, 
closely set, very flexuous, unequally developed alternately, extending to a considerable 
distance, and confluent with those of the adjoining individuals. Some appearance 
of a pseudo-columella produced by the inner extremity of the large septa; some 
of which are slightly curved. 35 or 40 of these occupy the calicinal space, 
but exteriorly the number of the septo-costal ridges augments greatly, and varies much. 
Diameter of the calicmal circles 23 or 3 lines; depth of the calicinal fossula about half a 
line. A vertical section shows that the vesicular tissue is rather dense, the cells somewhat 
unequal in size, and presenting vertical septo-costal strize, in general distinct, although 
small. 
Much Wenlock. 
Specimens are in the Collections of the Museum of Practical Geology, of the Parisian 
Museum, of Mr. Bowerbank, and M. de Verneuil. 
This coral differs from all the other species of the genus Strombodes in not having any 
trace of exterior walls between the individuals. 
9. Genus SYRINGOPHYLLUM (p. Ixxil). 
SyrinGopHYLLUM orGANUM. ‘Tab. LXXI, figs. 3, 3a, 30. 
Maprepora composita, &c., Fougt, Amen. Acad., vol. i, p. 96, tab. iv, fig. 6, and No. 1, 
1749. 
— orGANUM, Linné, Syst. Nat., edit. 12, p. 1278, 1767. 
SARCINULA ORGANON, Schweigger, Handb. der Naturg., p. 420, 1820. 
= ORGANUM, Goldfuss, Petref. Germ., vol. i, p. 73, tab. xxiv, fig. 10, 1826. (Not 
Lamarck.) 
— ORGANON, Hichwald, Zool. Spec., vol. i, p. 189, 1829. 
— orGanum, Holl, Handb. der Petref., p. 401, 1830. 
— = De Blainville, Dic. Se. Nat., vol. Ix, p. 314, 1830.—Man., p. 348. 
— — Morren, Descr. Cor. Belg., p. 67, 1832. 
= — Hisinger, Leth. Suec., p. 97, tab. xxvii, fig. 8, 1837. 
— — Fichwald, Sil. Syst. in Esthland, p. 199, 1840. 
ASTREOPORA ORGANUM, D’ Orbigny, Prodr. de Paleont., vol.i, p. 50, 1850. 
SaRcINULA oRGANUM, M‘Coy, Brit. Paleeoz. Foss., p. 37, 1851. 
SyYRINGOPHYLLUM oRGANUM, Milne Edwards and Jules Haime (Introd., p. Ixii, 1850), Pol. 
Foss. des Terr. Paleeoz. (Arch. du Mus., vol. 5), p. 490, 
1851. 
Corallum massive, astreiform, rather tall; gemmation lateral; calices of unequal size, 
circular, rather prominent, and placed at a distance from each other about equal to their 
diameter ; costee thin, but slightly prominent, equally developed, separated by large furrows, 
straight or slightly flexuous, and extending to the bottom of the inter calicular space, where 
