82 BRITISH FOSSIL CORALS. 



and M. irregularis} by the somewhat compressed form of its calice. It differs from 

 M. caryojikyllata^ M. brevissima,^ M. pateriformis} M. Guerangeri} M. LotJiaringa,^ 

 M. Goldfussana} M. Jiippuritiformis}' M. plicata,^ M. pidamensis}^ M. decipiens}^ 

 M. Guettardi}' M. cyclolitoides}'^ C. trouvillensis}'^ by its nmnerous septa, wliereas in the 

 above-mentioned species there are only five cycla. The same character distinguishes it from 

 M. detrita}^ M. incequalis}^ M. sycodes}'' M. Stutchhuryi}^ M. luciensis}'^ and M. striatulata}'^ 

 which have only four cycla. On the contrary, the septa are more numerous in M. trun- 

 catcF and in M. Lesueuri^^ than in M. dispar ; instead of six cycla, they constitute in 

 general seven complete cycla. 



Six cycla are also met with in M. trocJioides,"^ M. ponderosa,"* M. Beaumonti,^' 

 M-ptatellata}"^ M. subtruncata,"'' and M. dUatata"^ ; but M. dispar may be distinguished from 

 M. trochoideP and M. BeavMonti by its general form, which is not so regularly conical as 

 in these, by the apparent shallowness of its fossula and its large size. It is proportionally 

 much taller than M. subtruncata and 31. patellata, and its basis is far from being as broad 

 as the calice, as is the case with the latter. M. p)onderosa is also much shorter than 

 M. dispar, and its basis is quite convex. 



The general form of the corallum is also very different in most of the other species of 

 this numerous group. Thus, M. numismalis}^ M. depressa,^^ M. lens^'^ M. Delabechii,^^ 



1 Milne Edwards and J. Haime, Ann., 1. c, p. 298 ; AnthophjUum dispar, Micheliu, Icon., pi. xr, fig. 6. 



2 Lamouroux, Exp. Metli. des Genres de Pol., pi. Ixxix, figs, 8, 9, 10. 



3 Milne Edwards and J. Haime, 1. c, p. 293, 



* Anthophyllum pater if orme, Michelin, Icon,, pi. xc, fig. 3, 



5 Milne Edwards and J. Haime, 1. c, p. 293. ^ i^^ p 294. 7 ib. 



* Turhinolia hippuritiformis, Miclielin, Icon., pi. Ixix, fig. 7. 

 ' Ellipsosmilia plicata, D'Orbigny, Prod., vol. ii, p. 30. 



10 D'Orbigny, Prod., t. i, p. 292. 



'1 Anthophijllum decipiens, Goldfuss, Petref., tab. Ixix, fig. 3. 



1^ Blainville, Diet. So. Nat., t. Ix, p. 302. 



1^ Thecophyllia cyclolitoides, Milne Edwards and J. Haime, 1. c, p. 242. 



1' D'Orbigny, Prod., t. i, p. 384. 



'5 Anthophyllum detrilum, Michelin, Icon., pi. x, fig. 1. 



1*^ Anthoplujllum incequale, Michelin, Icon., pi. xc, fig. 4. 



17 Milne Edwards and J. Haime, 1. c, p. 299. 



1* Tab. xxvii, figs. 3, 9. 



19 D'Orbigny, Prod., t. i, p. 321. 



20 CaryophjIIia striatidata, Michelin, Icon,, pi. xc, fig. 9. 



21 CaryuphylUa truncata, Defrance, Diet. Sc. Nat., vol. vii, fig. 198. 



22 Milne Edwards and J. Haime, 1. c, p. 297. 23 ib., p. 299. 2-1 lb., p, 242. 



25 Thecophyllia Beaumonti, Mihie Edwards and J. Haime, p. 243, 



26 Anthophyllum patellatum, Michelin, Icon., pi. xc, fig. 2. 



27 Caryophyllia truncata, Lamouroux, Exp. Meth., pi. Ixxviii, fig. 9. 



2** Caryophyllia ddatata, Michelin, Icon., pi. xvii, fig. 4. 29 I'^b. xxvi, figs. 2, 4. 



30 D'Orbigny, Prod., t. i, p. 321. ^i T^b. xxix, fig. 5. 32 Tab. xxvi, fig. 7. ^3 x^b. xxvi, fig. 5. 



