TOMES : MESOZOIC CORALS OF THE COUNTY OF YORK. 
81 
One specimen only of this coral has been examined, and it 
agrees very closely with the description and figure given by 
Dr. de Fromentel. The branches are small, sub-cylindrical, and 
the ramifications are strictly dichotomous. The epitheca is thin 
and pellicular, and the costie are thin, rather prominent, and 
distant, the spaces between them being nearly three times the 
breadth of the corresponding spaces in Thecosmilia annularis. 
But the breadth of the intervals is the result of an almost 
rudimentary condition of the alternate cost?e, which, indeed, are 
sometimes scarcely observable. 
The calices are not well preserved, and the cycles of septa 
are difficult to trace, but there are certainly four cycles, w^iich 
number corresponds very nearly with the formula given by the 
original describer of the species. 
ISASTRiEA EXPLANATA GoldfuSS sp. 
Astroia explanata Goldf., Petrif. Germ., Y. I., p. 112, 
tab. xxxviii., fig. 14, 1829. 
Isastrcea explanata Edw. and Haime, Brit. Fos. Cor., p. 94, 
pi. xvii., fig. 1. 1851. 
I have seen and examined some casts of an Isastrcea from 
the Coral Rag of Malton, which I do not hesitate to refer to 
this species. 
Latim.eaxdrar^a decorata Bean sp. 
Meandrina decorata Bean MS. 
Latimmandraro'u decorata Tomes, Quart. Joun. Geol. Soc, 
YoL XXXIX., p. 562, pi. xxii., figs. 7, 8, 9, 10. 1888. 
Two specimens of this well-marked species which were given 
to me by Mr. Bean, of Scarborough, labelled " Meandrina 
decorata Bean, Coralline Oolite, Malton," were described and 
figured by me in the thirty-ninth volume of the Quarterly 
Journal of the Geological Society. Specimens of this species 
from the Coralline Oolite of Malton and Langton Wold are in 
the York Museum, which, having been submitted to the author, 
indicate great variation in the general form, while they show 
great uniformity of structure. 
G 
