1869.] DR. J. E. GRAY ON IANTHELLA. 49 
umbonal ridges closely and strongly granulated ; anterior side semi- 
ovate ; posterior side obliquely truncate ; dorsal margin posteriorly 
sloping, anteriorly slightly convex ; umbonal ridge raised, obtusely 
angulate and slightly curved ; ventral margin a little arcuated ; hinge 
with the cartilage-processes small ; pallial sinus deep, extending be- 
yond the umbones and nearly to the middle of the shell. 
Long. 113, alt. 6, lat. 3 lines. 
Hab. Port Jackson, dredged off the ‘Sow and Pigs” reef, in 
four fathoms water (Brazier). 
. 
6. On a new Species of Haliotis from New South Wales. 
By J. C. Cox, M.D., C.M.Z.S. 
HALiotis HARGRAVESI, Cox. 
Shell orbicularly ovate, spire much raised, rather thin, flatly de- 
pressed in the centre between the spire and the perforations, longi- 
tudinally strongly ribbed, with nine to ten ribs, which are flat and 
coarsely lamellose on the surface, intercostal spaces scarcely sca- 
brous, perforations long and tubular, five open; internal surface 
longitudinally grooved, the depressions corresponding with the raised 
ribs without; exterior variegated with red and olive-green, within 
silvery. 
Length 1,7; inch, breadth ;%, inch. 
Hab. Broken-Bay Heads, north coast of New South Wales. 
7. Note on Janthella, a new Genus of Keratose Sponges. 
By Dr. J. E. Gray, F.R.S., V.P.Z.S. 
Several of the older naturalists, as Rumphius (Amb. Rar. t. 80. 
f. 1), Seba (Thesaurus, ill. t. 95. f. 2-4), and perhaps Petiver 
(Gazoph. il. t. 32. f. 1), figure a horny netted marine sponge, for 
which Pallas (Zoophytes, 320) adopted the name of Spongia flabel- 
liformis, given by Seba ‘to his first figure (t. 95. f. 2). Under this 
name a good specimen of it is figured by Esper in his ‘ Zoophytes,’ 
t. 13. 
The frond looks much more like the very slender netted axis of a 
species of Venus’s Fan (Rhipidogorgia) stripped of its bark than 
a sponge. 
Carefully collected and well-preserved specimens of this sponge 
are more or less covered with a quantity of dried mucilaginous sar- 
code, that fills up the spaces between the horny network, and covers 
the frond with a black polished coat. 
It is doubtless a peculiar form of keratose sponges, most likely 
the type of a separate family. 
Proc. Zoou. Soc.—1869, No. IV. 
