R. E. TORIES ON THE GREAT-OOLITE MADREPORARIA. 181 



examples of M. caryophyllata only in having the epitheca less regu- 

 larly developed, and extending a little higher up the eorallum. 

 Most of the examples differ also in being a little more upright 

 in their growth. 



There is an obvious error in the description given of this coral by 

 MM. Milne-Edwards and Haime *. The number of cycles of septa 

 given by them is five and part of a sixth. This statement, how- 

 ever, has been corrected by M. de Fromentel, who says that there 

 are in a large calice as many as 162 visible septa f . In the calices 

 of those I have examined there are about 108 septa. 



Montlivaltia Slatteri, n. sp. Plate VII. fig. 20. 



The eorallum is broadly attached and low, and much resembles 

 that of M. Smithi, but differs entirely from it in having the fossula 

 linear. There is sometimes, but not always, a constriction around 

 the eorallum, about its middle, as in M. Smithi. The epitheca is 

 strongly developed, and deeply marked with concentric wrinkles. 

 It does not extend more than two thirds of the height of the 

 eorallum. 



The calice is open, a little ovoid; and the linear fossula corre- 

 sponds with the greatest diameter. The septa are exsert, and rise 

 from the upper margin of the epitheca vertically ; and forming an 

 angle which is less than a right angle, but which is rounded, they 

 pass in a nearly straight, inward and downward line to the 

 fossula. They are all extremely thin and delicate ; and their margins 

 have small and irregular points, which are not thickly placed, and 

 become very indistinct towards the fossula. Their sides are orna- 

 mented by a number of spots of very irregular form, which have 

 very little prominence, and are placed in ill-defined vertical rows. 

 These markings on the sides of the septa (fig. 20) are quite sufficient 

 to distinguish the present species. There are as many as 130 to 135 

 septa, 18 of which extend quite to the fossula. 



The height of the eorallum is from 8 lines to 1 inch 3 lines, and 

 the greatest diameter of the calice 1 inch 5 lines. The length of 

 the fossula is from 5 to 8 lines. 



It occurs at Fairford, but appears to be rare. 



MOXTLIVALTTA FAIREORDENSIS, n. sp. Plate VII. fig. 21. 



The eorallum, when not rendered irregular by rejuvenesence, has 

 very much the general form of an Axosmilia, but has a considerably 

 elongated calice, and a fossula which is so much extended as to 

 occupy fully one half of the calice. 



The epitheca is well developed, but thin and almost without con- 

 centric markings. It does not extend to the edge of the calice ; and its 

 superior margin is well defined and regular. The septa are exsert ; 

 but the calice is deep, and the fossula well defined and open. The 

 edges of the septa (fig. 21) are thin and serrated ; and the teeth are 

 formed by the upper termination of a row of closely placed tubercles, 



* Hist. Nat. Corall. t. ii. p. 303. 



t Paleont. Framj. Terr. J urass. Zooph. p. 202. 



o2 



