10 BRITISH FOSSIL CORALS 



Tlie calice is elliptical ; the summit of the larger axis is rounded. 



Forty-eight costa;, subequal, straight, fine, and granular. 



Height of the corallum, about ^rd inch. 



Locality. Farringdon. 



MM. Milne-Edwards and Jules Haime do not mention where their specimen is 

 deposited. Mr. Vicary, of E,\eter, has a fine specimen of this Coral. 



The genus Smilotrochus has become of some importance in the palaeontology of the 

 Cretaceous rocks. The species are distributed as follows in Great Britain : 



elongatus, Duncan clipper Greensand. 



Smilotrochus tuherosus, Ed. and H."! 

 „ elongatus, Du 



„ angulattcs, , 



„ elongatus, „ \ 



,, qranulatus, „ 



. . . )GauIt. 



,, insigms, ,, i 



„ cylindricus, ,, J 



„ Austcni, Ed. and II. Lower Greensand. 



Smilotrochus elongatus, Duncan, is found in the Gault and Upper Greensand. 

 Smilotrochus Hagenowi, Ed. and H., is a fossil from the Maestricht Chalk (Ed. and H., 

 ' Hist. Nat. des Corall.,' vol. ii, p. 71). Smilotrochus irregularis, E. de Fromentel, is a 

 small cornute form, with rounded primary costae and rather an open calice ; it is from the 

 Chalk ('Pal. Franp.,' tome viii, livraison 4, Zooph., pi. ix). 



Sub-famihj — CaryophylliNjE. 



Division CARYOPHYLLIACEiE. 



Genus — Brachycyathus. 

 1. Brachvcyathus Orbignyancs, Ed. and H. PI. XV, figs. 8, 9. 



The corallum is very short. 



The costae are indistinct. 



The septa are long, very slightly exsert, granulated from below upwards, and there 

 are four cycles in six systems. The primary and secondary septa are equal. The 

 tertiary are a little longer than those of the fourth cycle. All are thin and straight. 



The pali are like continuations of the tertiary septa before which they are placed. 

 They are granular. 



Height, J^th inch. Breadth, i^ths inch. 



