CORALS FROM THE INFERIOR OOLITE. 129 



Genus Montlivaltia, (p. xxv.) 



1. MoNTLiVALTiA TRocHoiDES. Tab. XXVI, figs. 2, 2«, 3, 3a, 10; and Tab. XXVII, 



figs. 2, 2tt, 4. 



MoNTLivALTiA CAKYOPHYLLATA, Broun, Letli. Geogn., tab. xvi, fig. 17, 1836. 



— TROCHOIDES, Milne Edwards and /. Haime, Ann. des Sc. Nat., s. 3, vol. x, 



p. 299, 1848. 



Corallum simple, turbinate, rather tall, and in general straight, but varying much as to 

 proportions. Basis obtuse in some specimens ; subpedicellate in others. Epitheca thick, 

 wrinkled, and extending to a short distance from the calicular edge. Calice circular, or 

 sometimes oval and shallow; the fossula small and circular, or somewhat oval. No 

 columella. Septa forming in adult specimens five complete cycla, and often an incomplete 

 sixth cyclum in one half of some of the systems ; those of the second cyclum as large as 

 the primary ones, and differing but little from the tertiary ones ; those of the last cyclum 

 very small. All these septa are thin, closely set, straight, or nearly so, somewhat granulose 

 laterally, and terminated by a delicately crenulated edge. Height of the corallum in 

 general about one inch and a half ; and diameter one inch two or three lines. 



Found in the Inferior Oolite at Charlcomb, by Mr. Walton. A specimen of the same 

 species, belonging to the collection of the Museum in Paris, is catalogued as having been 

 found in Germany. 



Montlivaltia trochoides much resembles the species for which this genus was established, 

 the M. caryophyllata ;i but it differs from it by the septa being thinner, and in general 

 more numerous, and more especially by its epitheca extending almost to the edge of the 

 calice ; whereas in M. caryophyllata this mural tunic ends at a considerable distance 

 below that margin. It may be easily distinguished from M. lens^ M. Belahechiif and 

 M. depressa^ which are all of a discoidal form, by its being much taller than broad ; from 

 M. TFaterhousev' and M. regularise by its basis not being regularly convex ; and from 

 M, Smithi' and M. cupuliformis^ by not being fixed by a broad basal surface, and having 

 thinner septa ; and from 31. deltoides^ M. rudis}^ M. cornucopim}'' M. bilohata^'^ and 

 M. irregidaris}^ by the circular form of the calice, which in all the latter is more or less 



1 Lamouroux, Exposit. Method, des Polyp., tab. Ixxix, figs. 8, 9, 10. 



2 Tab. xxvi, fig. /. ^ 'p^b. xxvi, fig. 5. ^ Tab. xxix, fig. 5. ^ Tab. xxvii, fig. 7. 

 6 D'Orbigny, Prod., vol. i, p. 346. 7 Tab. xxi, fig. 1. » Tab. xxvii, fig. 1. 

 ® Milne Edwards and Haime, Ann. des Sc. Nat., s. 3, vol. x, tab. vi, fig. 3. 



'0 Cyathoj)hijUum rude, Sowerby, Geol. Trans., s. 2, vol. iii, tab. xxxvii, fig. 2. 



'1 Milne IMwards and J. Haime, loc. cit., p. 298. 



^2 Turbinolia bilobata, Michelin, Iconogr., tab. Ixii, fig. 1, (not tab. Ixi, fig. 7.) 



^3 Milne Edwards and J. Haime, loc. cit., p. 298. 



17 . 



