RopER^ on Biddulphia. 
1 
Section I. — Valves with undulating margins^ and elevations 
separated by costse or deep constrictions. 
1. Biddulphia pulchella, Gray. (^Synopsis/ p. 48.) 
Marine ; not uncommon on the English coast, and generally 
distributed on the shores of Asia, Africa, and America. 
S^n. Conferva Biddulphiana. Eng. Bot., 1807, vol. xxv, t. 1762 
(upper tigures) ; Dillvvyn's Brit. Conf, 1809, p. 52. 
Biddulphia pulchella. Gray, Arr. Brit. PL, 1821, vol. i, p. 
294 ; Ehr. Ber. Tran., 1843, t. ii, vi, f. 18 ; Balfs, Ann. N. 
H., 1843, t. viii, f. 3 ; Pritcli. Inf., 1852, p. 456 ; Smith's 
Syn., 1856, vol. ii, t. 44, 45, 46, f. 321 ; Mont. Fl. d' Alger., 
p. 196. 
Diatoma BiDDULPHiANUM. Ag. Svst. Alg., 1824, p. 5, and Consp. 
Grit. Diat., 1830, p. 54 ; Hooker's Brit. Eior., 1833, p. 404; 
Harvey, Man., 1841, p. 201. 
Denticella Biddulphia. Elir. Ber. Tran., 1843, t. ii, vi, f. 19 ; 
Pritch. Inf., 1852, p. 345. 
Biddulphia tri-locularis. Kiitz. Bac., 1844, t. xix, f. 89, and Sp. 
^Ig , 1849, p. 137; Pritch. Inf., 1852, p. 456. 
Biddulphia auiNQUE-LOCULARis. Kiitz. Bac., 1844, t. xix, f, 1, 
and Sp. Alg, 1849, p. 137; Pritch. Inf., p. 457. 
Biddulphia septem-locularis. Kiitz. Bac., 1844, t. xix, f. 2, and 
Sp. Alg., 1849, p. 138 ; Pritch. Inf., 1852, p. 457. 
Biddulphia australis. Mont. PI. Cel. de Cuba, 1845, p. 5. 
This beautiful and cosmopolitan species has been so well 
described by Professor Smithy Mr. Ralfs^"^ and others, that 
there is little to add as to its general structure. I may, 
however, remark, as corroborative of the opinion maintained 
by Professor Smith, that the apparent openings at the ex- 
tremities of the produced angles, are in fact closed by a 
slight siliceous membrane, that they will be found in perfect 
specimens to be fringed by thickened projecting points of 
siliceous matter, having the appearance of spines, and re- 
sembling in some degree the peristome of a moss. 
With respect to the synonymy, I am rather doubtful 
whether the Biddulphia australis of Montague ought not 
rather to be referred to the B. Tuomeyii of Bailey. By the 
kind assistance of Dr. Hooker, I have been able to refer to 
his original descriptions, in which he says, " Les cinq cellules 
longitudinales qui terminent d^articule a chacune de ces 
extremites ne sont pas egales, et que ce sont les deux externes, 
et la moyenne qui saillent davantage, les intermediares 
restant plus courtes ;^^t and he states that for that reason and 
* 'An. Nat. Hist.,' 1 ser., vol. xii, p. 274. 
•f Ramon de la Sagra, 'Hist, de Cuba,' p. 5. 
