CORALS FROM THE LIAS. 145 



The genus Thecoci/athus as yet comprises only two other species, which ef[ually belong 

 to the Upper Lias: T. tintimiahulmn^ and T. mactra;'^ T. Moorii differs from both, by 

 the direction of the septa and by the form of the pali. 



Genus Trochocyathus (p. xiv). 



Trochocyathus ? PRIMUS. Tab. XXX, fig. 8. 



Corallum simple, svibpedicellate, conical at its basis, cylindrical higher up, and sometimes 

 shghtly curved ; twelve sub-equal costse. Height nearly three Hnes; diameter of the calice 

 about half a line. 



Found in the superior Lias at Ilminster, by Mr, Ch. Moore. 



We are very uncertain as to the zoological affinities of this small Coral ; it is in a very 

 imperfect state of preservation, and, as far as its characters are known, appears to belong 

 to the genus Trochocyathus; it differs from the other species of that group by its slender 

 form and very small number of septa. 



Family— CYATHOPHYLLID/E (p. Ixv). 



Genus Cyathophyllum (p. Ixviii). 



Cyathophyllum ? NOVUM. Tab. XXX, fig. 7. 



Corallum simple, ceratiform, presenting but very slight circular constrictions, and 

 covered with a thin epitheca. Calice almost circular, deep, and having a thin margin. 

 Septa narrow, very thin, unequal alternately, and about 120 in number. Height, 

 2^ inches ; diameter of the calice, 1 inch 2 lines. 



The fossil Coral here described belongs to the collection of the Geological Society of 

 London, and is entered in the catalogue of that establishment has having been found in 

 the Lias, but without any other indication. It is in such a bad state of preservation 

 that we have not been able to ascertain, with any degree of certainty, its generic characters; 

 but it much resembles, by its general form, some species of the carboniferous periods 

 belonging to the genus Ci/athophi/llum, in which we have placed it provisionally. 



The Coral, of which a cast was found in the Lias at Wiston, by Mr. Walton, as above- 

 mentioned, had very delicate and numerous straight septa ; its calice was oval, and about 

 1 inch 3 lines broad in one direction, 1 inch in the other ; it appears to be referable to the 

 genus Montlivaltia. 



1 Cyathophyllum tintinnahulum, Goldfuss, Petref. Germ., tab. xvi, fig. C. 



2 Cyathophyllum mactra, Goldfuss, op, cit., tab. xvi, fig. 7. 



19 



