1 88 THE GENUS MONTICULIPORA. 



Monticulipora (Monotrypa) pulchella, Edwards and Haime. 

 (Figs. 38, 39) 



ChcEtetcs piilchcUus^ Milne-Edwards and Haime, Pol. Foss. des Terr. Pal, p. 



271, 1851. 

 Monticulipora ptdchella, Edwards and Haime, Brit. Foss. Cor., p. 267, PI. 



Lxn. figs. 5-5/., 1854. 



{Nan Chcetetcs pidchellus, Nich., Quart. Journ. Geol. Soc, vol. xxx. p. 

 503, 1874, and Pal. Ohio, vol. ii. p. 195, 1875.) 



Spec. Char. — Corallum ramose, the branches cylindrical or 

 compressed, from two to six lines in diameter. Surface not 

 exhibiting regular monticules, but having clusters of compara- 

 tively large-sized corallites, which are not markedly elevated 

 above the general surface, interspersed at intervals among the 

 average tubes. Calices thin-walled and polygonal in shape, 

 those of the averao^e corallites havino- a creneral diameter of 

 about I -60th inch, while those of the clusters have a diameter 

 of from I -45th to i-40th inch. Struchirally, 2\\ the corallites 

 of the corallum are of one kind, the large tubes of the clus- 

 ters only differing from those of average dimensions in point 

 of size. The walls of the tubes become thickened as they 

 approach the surface, but the primitive boundaries between 

 contiguous corallites remain permanently recognisable. The 

 tubes are all equally provided with a moderate number of 

 complete approximately horizontal tabulae. 



'.'P-^' risk 



B 



Fig. 38. — A, Part of a typical specimen oi Mouticidipora pulchcUa, E. and II., from the Wen- 

 lock Limestone of Dudley, of the natural size ; B, Part of the surface of the same, em- 

 bracing one of the clusters of large corallites, enlarged. 



Obs. — As regards its external aspect, this species is chiefly- 

 distinguished by the polygonal thin-walled calices (fig, 38, r;), 



