FROM THE GAULT. 35 



Clay. Leptocyathus elegans has not a flat base, and it has very granular septa. Moreover, 

 its costEB are large and small in sets. Nevertheless the alliance is of the closest kind. 



Genus — Bathtcyathus. 



MM. Milne-Edwards and Jules Haime described a species of this genus in their 

 ' Monograph of the British Fossil Corals,' Part I, pp. 67, 68. Two specimens in the 

 Collection of Rev. T. Wiltshire present all the appearances recognised by those distinguished 

 authors. The costas are very granular, and not in a simple row. In one specimen the 

 breadth of the base is very great (PI. XII, figs. 5 — 7). 



Family— TURBINOLIDtE. 



Sub-Family — TcuBiNOLiNiE. 



Division — TuBiNOLiACEiE. 



Gemis — Smilotrochxjs. 



Some species of this genus were described amongst the Corals from the Upper Green- 

 sand,^ and one was noticed as belonging to this geological horizon which should have 

 been included with the Lower Greensand forms. 



The Upper Greensand Smilotrochi are — 



• SmilotrocJius tuberosus, Ed. and H. 

 ,, elongatus, Duncan. 



There are four species of the genus found in the Gault, which are all closely allied. 

 One of them cannot be distinguished from SmilotrocJius elongatus of the Upper 

 Greensand. 



The specimens of this species found in the Upper Greensand are invariably worn and 

 rolled, and are generally in the form of casts ; but in the Gault the structural details are 

 well preserved, and even the lateral spines on the septa are distinct. 



The Gault forms are shorter and more cylindro-conical and curved than those from the 

 Upper Greensand. 



^ See ante, p. 19. 

 6 



