X1V BRITISH FOSSIL CORALS. 
7. Genus CycLocyatuts. 
Corallum simple, discoidal, and having the same characters as the preceding genus, 
except that the co/wmella is fasciculate and papillous. 
Typ. sp., Cyclocyathus Fittonii, nob. 
§ 2. Pali of divers orders, forming two or more coronets. 
8. Genus TROCHOCYATHUS. 
Milne Edw. and J. Haime, loc. cit., p. 300, 1848. 
Corallum simple, pediculate or sub-pediculate, but free im the adult state. Calice with 
a broad but not very deep fossula. Co/wmella well developed, and composed of prismatic or 
twisted processes disposed fascicularly or in a single row. Pali well developed, entire, free 
on both edges, and differmg in breadth according to the coronet to which they belong. 
Septa very Sen broad, thick near the wall, einated laterally, and forming from four fa 
six cycla. Coste often armed, 
Typ. sp., Trochocyathus mitratus, nob. (T. mitratus et T. plicatus, Milne Edw. and J. Haime, loc. cit., 
p. 303); Turbinolia mitrata, Goldfuss, op. cit., pl. xv, fig. 5; Turbinolia plicata, Michelotti, Specim. 
Zooph. dil., tab. ii, fig. 9. 
9. Genus LupTocyaTHUS. 
Corallum presenting most of the characters of the preceding genus, from which it differs 
by its subdiscoid form, and its not showing any trace of adherence. 
Typ. sp., Leptocyathus elegans, nob. 
10. Genus THucocyaTHus. 
Milne Edw. and J. Haime, loc. cit., p. 317, 1848. 
Corallum simple, very short, and adherent, at least when young. Calice circular, with 
the fossula shallow. Co/wmella very large, fasciculate, formed by a great number of prismatic 
processes, and terminated by a flat papillous apex. Pa/i thick, narrow, short, and entire, 
those corresponding to the penultimate cyclum of septa the most developed. Septa not 
exsert, thick, closely set, and almost equally developed ; systems equally developed. Mail 
covered by a complete epitheca, slightly striated transversely, and constituting around the 
calice a small projecting ring. 
Typ. sp., Thecocyathus tintinnabulum, Milne Edw. and J. Haime, loc. cit., p. 317; Cyathophyllum 
tintinnabulum, Goldfuss, Petref. Germ., tab. xvi, fig. 6. 
ll. Genus Paracyatuts. 
Milne Edw. and J. Haime, loc. cit., p. 318, 1848. 
Corallum simple, subturbinate, and having a broad adherent basis. Ca/ice with a large 
but not very deep fossula. Co/wmella very broad, terminated by a papillous surface, and 
