100 
NAT7TILOIDEA. 
vol. vii. pp. 203 et seq.\ but Orthoceras is not mentioned therein. 
Prof. T. B-upert Jones in his “ jS’otes on some Possils from the 
Devonian Bocks of the Witzenberg Plats, Cape Colony” (Quart. 
Journ. Geol. Soc. vol. xxviii. 1872, p. 28), records the occurrence of 
Orthoceras vittatum^ Sandb., amongst other Devonian mollusks, but 
I am unable to identify the specimens in the collection with this 
species. 
Horizon. Devonian (division unknown). 
Locality. Guerboom Biver, Plettenberg Bay, South Africa. Pre- 
sented by W. E. Balston, Esq., P.L.S., P.G.S. 
Orthoceras Chinense, Poord. 
1856. Orthoceras, sp., S. P. Woodward, Quart. Journ. Geol. Soc. vol. 
xii. p. 378, pi. vi. f. 1. 
1869. Orthoceras, sp., Kingsmill, Quart. Journ. Geol. Soc. vol. xxv. 
p. 126. 
1857. Orthoceras, sp., Grieve, Trans. Nat. Hist. Soc. Glasgow, vol. i. 
(n. s.), p. 3, pi. vi. 
Char. Shell straight, cylindrical. Bate of increase 1 in 9. 
Length of body-chamber unknown. Septa distant about ^ the 
diameter or more, but becoming more crowded as they approach the 
chamber of habitation ; direct ; strongly arched ; the necks very 
long, so as to reach nearly halfway across the space between two 
septa. Siphuncle central, cylindrical, very slightly constricted 
between the necks. Test unknown. 
BemarJcs. This is the well-known “ Pagoda-stone ” ^ of the 
Chinese, and as it appears to be specifically separable from other 
Palseozoic Ortho ceratites, I have judged it advisable to give it a 
specific name. 
The species nearest to it is one described by M. Barrande from 
the Silurian rocks (Etage E) of the Bohemian basin, under the name 
of Orthoceras jucundum Prom this it is distinguished by the 
much greater length of the necks of the septa. 
The present species is known only by polished sections ; there are 
therefore no surface characters by which to discriminate it. 
The largest specimen in the Collection is about 2 feet 6 inches 
long, of which the small portion of the body-chamber preserved 
occupies 2 inches. Its greatest diameter is 4 inches. A smaller 
^ So called from the belief existing among the Chinese that the stone is 
formed underground in places' upon whose surface the tower of a pagoda has 
thrown its shadow (Hochstetter, in ‘ Geologist ’ for 1860, p. 419). 
* Syst. Sil. de la Boheme, vol. ii. Texte iii. 1874, p. 518, pi. ccclxxx. ff. 4-7, 
pi. ccocix. ff. 7-10. 
