8 
RopER^ on Biddulphia. 
some others of minor importance, he considers it distinct 
from B. pulchella, of Gray. But I find in the ' Flore 
d^Algerie/ he gives a description of B. pulchella, and there 
refers to his former B. australis as synonymous and as 
Kiitzing has adopted the same view_,t in the absence of 
figures or authentic specimens^ I feel bound to follow these 
later opinions. 
The Denticella Biddulphia of Ehrenherg is clearly referable 
to this species, as the only distinguishing character, either in 
his figures or descriptions, is the presence of setse or the awl- 
shaped spines of Professor Smith on the central lobe, which 
may always be seen in perfect frustules. 
2. Biddulphia regina, W. S. Synopsis/ p. 50.) 
Marine. Island of Skye, Barlee. 
Smith's Sjn. Brit. Diat., 1856, p. 50, t. M, f. 323. 
This fine species, described, as far as I am aware, for the 
first time by Professor Smith, has not hitherto been noticed 
in any other locality than that above referred to, nor can I 
find any reference among the numerous papers of Ehrenberg, 
or those of Kiitzing, or Professor Bailey, that leads me to 
believe they have seen a similar form. Professor Smith 
alludes to the possibility of its being identical with the 
Zygoceros Tuo7neyii of Bailey, but I shall endeavour to show 
in discussing that species that there can be little doubt it is 
entitled to rank as a distinct form. 
3. Biddulphia Tuomeyii, Bailey (sp.) 
Valve elliptical, margin undulating, usually with one or 
three median elevations or lobes, occasionally more, the 
central one always the largest, and all more or less spinous ; 
processes long, narrow, and turgid at the base ; areolation 
circular, small, and generally in concentric lines on the lobes^ 
finer and parallel on the connecting membrane. (PI. I, figs. 
Marine. Petersburg (Virginia), Piscataway, and Bermuda; 
Bailey. Natal; Shadbolt. C alif or nian guano; Roper. Levant 
mud ; Williamson. 
Si/n. Zygoceros Tuomeyii, Bailey, 1844, Sil. Journ., vol. xlvi, t. iii, 
f. 3, 4, 8 ; E. Quekett, Lon. Phys. Journal, 1843, t. ix, 
f. 3, 5, 8 ; Williamson, Mem. Phil. Soc. Manch., 1848, t. i, 
f. 1. 
Denticella TRn)ENS. Ehr. Ber. Trans., 1839, p. 73. 
* Mont., 'Elore d'Algerie,' p. 196. 
t 'Spec.Alg.,' p. 137. 
