FROM THE LOWER GREENSAND. 41 



Locality. East Slmlford, Surrey. Base of the Lower Greensand ; found with 

 CeritUmn Neocomiense, D'Orb. ; Exogyra subplicata, Tqm. ; Area Eadini, Leym. ; Tere- 

 hratvla sella, Sow. In the Collection of C. J. A. Meyer, Esq., F.G.8. 



The specimen upon which the genus was founded was found in the Neocoraian forma- 

 tion of the Hautes Alpes, at St. Juhen, Beauchene. I have added to the original descrip- 

 tion, as some portions of the English specimen are better preserved than the type. 



Family— ASTR^IDiE. 



Sub-family — Eusmilin^e. 



Division — Troohosmiliace^. 



Genus — Trochosmilia. 



Trochosmilia Meyeri, Duncan. PL XV, figs. 1 — 7. 



The corallum is small, cylindrical or cyhndro-conical. Its base may be wide or very 

 small, and was adherent. 



The epitheca is complete. 



The costge are very small, and are occasionally seen where the epitheca is worn. 



The calice is rather deep. 



The septa are crowded, unequal, spined near the axis, and form six systems. There 

 are four cycles of septa. 



The cahce is usually circular in outline, but it is occasionally compressed. 



The axial space is small. 



The endotheca is very scanty. 



Height, i^ths inch. Greatest breadth, ^ths inch. 



Variety.— 1\\t corallum is short, broad, cylindrical, slightly constricted centrally, and 

 has a broad base. 



Height, -^ths inch. Breadth, ^ths inch. 



Locality. Bargate Stone ; upper division of the Lower Greensand. Guildford, 

 Surrey. Found with Avicula pectinata, Sow. In the Collection of C. J. A. Meyer, 



Esq., F.G.S. 



These small Trocliosmilia are common in the Bargate Stone, where they were 

 discovered by Mr. Meyer, from whom I have obtained the names of the associated fossils. 

 The presence of epitheca would apparently necessitate these fossils being placed in a new 

 genus, but, after a careful examination of the bearings of the absence or presence of 



