34 THE FOSSIL CORALS AND 



Suhfcmih/ ASTBJEIN^. 



Genus MONTLIVALTIA. 



Montlivaltia, M. Ed. Sf J. Eaime, op. cit. vol. ii. p. 296. 



1 MoNTLiVALTiA Geanti, D'AfcMac & Eaime. Plate XI, Figs. 14-17. 



The corallum is hemispherical when full-grown, flatter and convex without and 

 concave within when young. The calice, widely open and shallow, is slightly elliptical, 

 and the axial space is of the same shape. The septa are slightly exsert at the margin, 

 rounded, slightly granular, and usually long, straight, and often rise on the free 

 margin into several minute lobes, of which there is a crown around the axial space. 

 There are at least six cycles of septa which are close at the wall. The larger septa 

 are subequal, and there is a considerable number of them, but they are small in relation 

 to the size of the calice; they are subequal at the costal end, and largely granular 

 there. There is no columella. 



The epitheca is granular, and is in strong transverse folds, the costse showing 

 between them, and it reaches very close to the margin. 



The base is very slightly flattened in old forms, as if by pressure ; but it is rounded 

 in the young, in which the costse do not show through the perfect epitheca. 



In the young forms the calice is deeper and there are fewer septa, but still they 

 are numerous. 



The costae in the fully-developed forms are subequal, project but slightly, are close,' 

 and have much exotheca between them. They are in little groups of longitudinal 

 convex fluting in the old forms, and each group consists of two large costse and three 

 intermediate ones between them. 



Height of corallum : large, 1 j^ inch ; small, ^q inch. 



Length of calice : large, 2-j% inches ; small, I-^q inch. 



Locality. Hills east of Lynyan, Eanikot group. Survey-number Xjf ^^*. 



Illustrations of the Species in Plate XI. 

 Fig. 14. Large corallum : natural size. 



15. The septa (part of) : magnified slightly. 



16. The costse and epitheca : magnified. 



17. Small corallum : natural size. 



This species was described and delineated by MM. DArchiac and Jules Haime 

 in their work, which has already been quoted ; and the specimens from Lynyan ao-ree in 

 their structures with the specific distinctions given. The type figured by them is a 

 more feebly grown individual than the larger form described above. In the lobed 

 character of the septal ends there is much similarity to the genus Antillia, Duncan; 

 but there does not appear to be a columella, which structure peculiarizes this genus. 



