Contributions to our Knowledge of the Spongida. 343 
West Lodge. It was chiefly from the foliage of the common 
bramble that I obtained it. 
Mr. Barrett, who has kindly examined it, says that very 
likely this mag be the var. petrosana; and indeed it agrees 
very well with Duponchel’s figure of the latter on his sixty- 
fifth plate. 
[To be continued.] 
XXXVIII . — Contributions to our Knowledge of the Spangida. 
By H. J. Carter, F.R.S. &c. 
[Plates XXVIII. & XXIX.] 
[Continued from p. 804. J 
Trachycladus Icevispirulifer , n. gen. et sp. 
(PL XXVIII. figs. 1-5.) 
Shrub-like, more or less compressed, stiff, consisting of a 
short irregularly round stem dividing at first dichotomously 
and then polychotomously into many branches, which termi¬ 
nate in digitations, more or less united laterally (PI. XXVIII. 
fig. 1). Colour white on the surface, whitish yellow inter¬ 
nally. Texture hard, dense. Surface reticulate, honeycomb- 
like, stiff, with small scopuliform processes along the lines of 
the reticulation, bearing a white incrustation composed of the 
flesh-spicules of the species. Internal structure of the stem 
and branches consisting of dense, compact, areolar sarcode, 
especially towards the centre, charged with the spicules of the 
species, expanding in lines from the axis of the branch up¬ 
wards and outwards, so as to end in the little scopuliform 
processes mentioned. Spicules of three forms (viz. one skele¬ 
ton- and two flesh-spicules) :—1, skeleton-spicule, acerate, 
curved, smooth, pointed gradually, acutely or obtusely, some¬ 
times acuate, l-85th by l-2400th inch in its greatest dimen¬ 
sions (fig. 2); 2, flesh-spicule, minute, filiform or vermiculate, 
consisting of an open spiral coil of one turn and half, smooth 
(that is, without spines), 1-1714th inch long (fig. 3); 3, flesh- 
spicule, bacillar, consisting of a short, thick, cylindrical, 
straight shaft, with rounded ends and narrow, linear, central 
inflation (fig. 4). The skeleton-spicules mixed with a few 
flesh -spicules of both forms are confined to the interior, while 
the white incrustation is exclusively formed of the flesh- 
spicules. Size of largest specimen 4x3x1^ inches; stem 
about 1 inch long and f inch thick. 
I lab. Marine. 
Loc. South Australia 
