458 Mr. R. Kirkpatrick on a new 
from depths of 140 and 154 fathoms, about 70 miles north of 
Lion’s Head, South Africa. 
Family Rossellide. 
Subfamily Acawruascryz, F. KE. Schulze, [1] p. 348. 
Genus RHABDOCALYPTUS, F. E. Schulze, [2] p. 155. 
Rhabdocalyptus lophodigitatus, sp. n. (PI. VIII.) 
Sponge in form of a thick-walled subglobular cup, from the 
base of which proceed solid digitate processes provided with 
tufts of basalia, forming in the fully grown condition a dense 
root-tuft ; tufts of basalia also originating from the general 
basal surface of the sponge. Outer surface provided with 
small conical papilla, from which bundles of pentact pleuralia 
project radially, the paratangential rays of the spicules forming 
a veil about 15 centim. from the surface. Orifice subcircular, 
with thin naked edge. Cavity of cup shallow, with smooth 
walls, and with very large openings at the lower part leading 
into wide cavernous efferent canals. 
Skeleton. —Purenchymalia long diacts, wholly smooth or 
roughened towards the ends, the more slender in bundles and 
the thicker isolated, those in the digitate basal processes 
being stouter and more spinous than those in the body-wall. 
Autodermalia finely spined diacts, 600-1000 yx 10-15 p, 
often with two or four central knobs. 
Hypodermalia oxypentacts with the paratangential rays 
paratropal, the two external often forming an angle of 180°, 
more or less curved, smooth, or finely shagreened, or sha- 
greened and provided with irregularly distributed thorns, 
sharp in young, but blunt and occasionally branched in older 
spicules. 
Basalia long oxypentacts with short orthotropal or para- 
tropal paratangentials, slightly curved, shagreened, and occa- 
sionally with small spines; the outer end of the proximal 
ray often shagreened. Diact basalia apparently absent. 
Autogristralia spinous diacts similar to the autodermalia. 
Microscleres.—1, Discoctasters : a, large kind, 1380-160 pw 
in diameter, knobbed centrum 12-14 yw, principal rays 18 yp, 
terminal rays 48-60 pw. 
Principal rays appearing to split up by fission at different 
levels into 6-8 terminal rays, the latter being slightly curved 
and divergent, and provided with fine spines pointing back- 
wards and a 4- to 8-toothed disk. 
b, small kind, 60 w in diameter, with secondary rays more 
divergent than in the large discoctasters. 
