Miscellaneous. 
93 
supplement to the British Fossil Corals, published by the Palaeonto- 
graphical Society, several new corals have been obtained at Haldon by 
Mr. Vicary, of Exeter. Twelve additional species were noticed, of 
which ten were new. This brings the total number of species in 
the Haldon Greensand up to twenty-one. The new species are thus 
distributed : — Aporosa: Oculinidae (1), Astraeidoe (3), Fungidae (5); 
Perforata, Turbinarne (2) ; Tabulata (1). The paper concluded 
with remarks on the genera and species represented, from which it 
appeared that the Coral fauna of Haldon is the northern expression 
of that of the French and Central European deposits, which are the 
equivalents of the British Upper Greensand. The Haldon deposit 
was formed in shallow water, and the corals grew upon the rolled 
debris of the age. 
2. “Notes on Pleurodon ajjinis, sp. ined., Agassiz, and Descrip¬ 
tion of three Spines of Cestracionts from the Lower Coal-measures.” 
By J. W. Davis, Esq., F.G.S. 
The author described some fossil remains of fish obtained from 
the bone-bed immediately above the “ Better-bed Coal ” referred to 
by him in a former paper (see Q. J. G. S. vol. xxxii. p. 332). The 
fossils described included Ichthyodorulites belonging to 4 species, 
namely: — Pleurodus ajjinis, a species named, but not described or 
figured by Agassiz ; Hoplonchus elegans, gen. et sp. nov.; Ctena- 
canthus cequistriatus , sp. nov.; and Phricacanthus biserialis, gen. et 
sp. nov. Teeth believed to be those of Pleurodus ajjinis were also 
described. 
MISCELLANEOUS. 
Diastylis bimarginatus. 
To the Editors of the Annals and Magazine of Natural History. 
Gentlemen,— When Mr. Sim sent me the specimen of Diastylis 
bimarginatus it was accompanied with his own drawing, which is 
similar to that which you have published in the last number of the 
4 Annals.’ It was because I had the opportunity of comparing it 
with the animal that I preferred making the sketch I sent to you. 
Had I received the animal in an unmutilated condition I could have 
entered into more minute detail. 
Yours faithfully, 
Plymouth, Dec. 22, 1878. C. Spence Bate. 
Germination of the Spores of Volvox dioicus. By M. IIennegey. 
Two years ago I communicated to the Academy of Sciences a note 
on the subject of the reproduction of Volvox dioicus, Cohn, in which 
I indicated the gradual appearance of sexuality in these organisms, 
