18 
EoPER^ 071 Biddulphia. 
12. Biddulphia Icevis, Ehrenberg. 
Valve orbicular or suborbicular^ minutely punctate, with 
minute submedian spines; processes large and truncate, 
frustules adhering by alternate angles, connecting mem- 
brane with fine oblique striae. (Plate II, figs. 24, 25, 26.) 
Marine. West Point, New York ; Bailey. Natal ; Roper. 
Spi. Gallionella ? Bailey, 1843, Sil. Jour,, vol. xlii, t. ii, f. 8. 
Biddulphia l^vis, Ehr. Ber. Trans., 1843, p. 122 ; Pritcli. Inf., 
1852, p. 457. 
Odontella poLiMOUPHA. Kutz. Bacil., 1844, t. xxix, f. 90; Spec. 
Alg., 1849, p. 1 3r3 ; Pritch. Inf., 1852, p. 470. 
IsTHMiA POLYMOKPHA, Montagiie, r quoted in Kiitz. Sp. Alg., 
Melosiiia thermalis, Menegliiui, \ 1849, p. 136. 
This species was discovered and first described by the late 
lamented Professor Bailey, as a species of Gallionella, as 
follows : " Corpuscles long, cylindrical, with two lines of 
constriction, adhering by alternate angles, so as to form long 
zigzag chains, and occasionally auricled ^ and he proceeds 
to say, "These curious bodies appear to partake of the 
characters of both Gallionella and Bacillaria, showing the 
cylindrical corpuscles of the former united by alternate 
angles as in the latter. It is perhaps related to the Diatoma 
auritum of Lyngbye.^^ On sending specimens to Ehrenberg, 
he at once detected its true character, and named it 
Biddulphia Icevis, which name I have therefore retained. 
The Bid. Icevis of the '^Mikrogeologie,^ t. xxxiii, xv, fig. 6, from 
Virginia, is quite distinct from the present form, and appears 
doubtfully placed in the genus. 
Through the kind assistance of M. De Brebisson and Dr. 
Walker- Arnott, I have been able to examine authentic speci- 
mens from Professor Bailey, and that it is correctly referred to 
the present genus I consider there can be little doubt. In form 
the valves are nearly allied to B. turgida, the large truncate 
processes and orbicular outline being characteristic of both, 
but the translucency and imperfectly siliceous character of 
B. Icevis, the position and slight projection of the angular 
processes, the absence of the long awl-shaped spines, and the 
much finer character of the striation, are at once sufiicient 
to render it easily distinguishable. 
In a very interesting slide of this species, mounted in fluid, 
by Professor Bailey, in the natural state, kindly lent me by 
Professor Quekett, there are apparently sporangial frustules 
formed in the same manner as those in Melosira Borreriijf and 
* * Sil. Jour.,' 1 ser., vol. xlii, p. 92. 
t See Smith's ' Synopsis,' vol. ii, t. 1. 
