PLANTS. 3 
Genus Polysiphonia, Greville. 
Diagnosis.—* Filaments partially or generally articulate, longitudinally striated 
with internal parallel tubes. Fruit double. 1 ovate capsule furnished with a 
terminal spore ; 2 granules immersed in distorted ramuli.”” 
The inarticulate Mucus fructiculosus, Wulf., common on the south coasts of England 
and Ireland, is the type of this genus. 
POLYSIPHONIA (?) STERNBERGIANA, Ang. Plate I, Fig. 2. 
Conrervitss (?), King. Catalogue, p. 5, 1848. 
This is a Conferva-like plant, with numerous filiform branches, proceeding from 
a slender stem. 
The only specimen apparently known was found in the Marl-slate of Thickley. 
Genus Caulerpa, Lamouroux. 
Diagnosis. —“ Frons viridis, membranacea, plana vel cylindracea, stipitata, surculo 
repente cartilagineo radicante instructa. Fructus... . (?)’”” 
M. Adolphe Brongniart, speaking of the fossil next to be described, and other three 
species found in the Kupferschiefer of Thuringia, states that “they appear to be 
related to the genus Caulerpa.”’ Perhaps it would not be going too far to suggest 
that they may belong to the fourth section of the genus characterised as having 
“yramulis undique imbricatis, linearibus vel setaceis.” (’) 
CAULERPA (?) SELAGINOIDES, Sternberg. Plate I, fig. 3. 
CAULERPITES SELAGINOIDES, Sternberg. Versuch. p. 20, 1821. 
— LYCOPODOIDES 55 Idem. 
FucoIpDEs LycopoporpEs, Sternberg. Brongniart, Vég. Foss. p. 73, pl. 9, fig. 3, 1828. 
— _ SELAGINOIDES as Idem, p. 73, pl. 9, fig. 2, 1828. 
(2) Onn oF THE “Two species oF Ferns,” cited by Sedgwick. Trans. Geol. Soc. Lond. 
2d series, vol. ii, p. 120, 1829. 
Vortz1a Puituipsit, Lindley and Hutton. Fossil Flora, vol. ii, pl. 195, 1836. 
(?) Pryna (?) Prisca, Minster. Beitrige, p. 45, pl. 4, fig. 4, 1839; and p. 66, pl. 4, 
fig. 4, 1843. 
() Sotzn, Geinitz. Grundriss, p. 450, 1846. 
FucorpEs (CauLErpa ?) tycopoporpes, Brong. King, Catalogue, p. 5, 1848. 
Voitzia, Howse. T. F. N.C. vol. i, p. 264, 1848. 
(2) Sotzn (?) pPInNmForRMIs, Geinitz. Versteinerungen, p. 8, 1848. 
CAULERPITES SELAGINOIDES, Sternb. Geinitz, Verst. p. 21, pl. 8, figs. 9, 10, 1848. 
' Smith, The English Flora, vol. v, p. 327, 1833. 
? Greville, Algze Britannicee, Synopsis, p. lxiii. 
° Histoire des Végétaux Fossiles, p. 43, 1828. 
