648 
ME. P. MAETIN DUNCAN ON THE GENEEA HETEEOPHYLLIA, 
arrangement is well observed. The dense wall and the dissepimental endotheca prove 
that the type of the mesozoic coral-fauna was foreshown. 
The generic characteristics may be admitted to be as follows. 
Genus Heterophyllia , M‘Coy. 
The corallum is simple, long, and slender. The gemmation takes place around the 
calicular margin, and is extracalicular. The septa are either irregular in number and 
arrangement, or else are six in number and regular. The costse are well developed, 
and may be tubercular, spined, and flexuous. The wall is thick, there is no epitheca, 
and the endotheca is dissepimental. 
The position of Heteropliyllia in the classification of the Madreporaria will be more 
easily comprehended after the following examination of the genus Battersbyia. 
3. Genus Battersbyia. 
The genus Battersbyia was founded by MM. Milne-Edwards and Jules Haime in 
order to include a very anomalous species which is very plentiful in the Devonian lime- 
stones of Torquay. 
Since that species was described I have discovered two others, whose anatomy renders 
the generic determination of MM. Milne-Edwards and Jules Haime capable of some 
extension, and the position of the genus in the classification of the Madreporaria more 
decided. The great French zoophytologists at first considered the species Battersbyia 
incequalis so anomalous as to form the type of a new division of fossil corals ; but sub- 
sequently they classified it amongst the Milleporidce , but evidently only provisionally. 
The study of the new species proves that the genus cannot be retained amongst the 
Milleporidce , and that the first suggestion of MM. Milne-Edwards and Jules Haime 
was correct. 
The reproduction of Battersbyia can be studied in the new specimens, and its peculiar 
character, and the evident absence of a ccenenchyma around the corallites, prove that the 
so-called ccenenchyma of Battersbyia incequalis is of stromatoparous origin and is parasitic. 
“ Genus Battersbyia , Milne-Edwards and Jules Haime*. 
“ The corallum is massive, and the gemmation is lateral. The walls are thick. The- 
septa are small but well developed. The ‘ planch ers’ are vesicular. The ccenenchyma 
is very lax and spongy.” 
1. Battersbyia incequalis, Ed. and H.* 
The corallum is massive ; the corallites are very unequal, they have thick but non-cos- 
tulate walls. The calices are circular. The septa are readily seen, but they are small 
and unequal. They are twenty six in number in the largest calices. The “planchers” 
are vesicular and fill up the visceral chamber. The ccenenchyma is scanty and spongy. 
* Monogr. des Polyp, des terr. Palseoz. 1851, p. 151. 
t Hist. Nat. des Corall. vol. iii. p. 244. Brit. Eoss. Corals, Pal. Soc. p. 213. pi. 47, fig. 2. 
