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Show 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 beyond the umbones and nearly to the middle of the shell. Long. 111, alt. 6, lat. 3 lines. Hab. Port Jackson, dredged off the " Sow and Pigs " reef, in four fathoms water (Brazier). 6. O n a n e w Species of Haliotis from N e w South Wales. B y J. C. COAX, M.D., C.M.Z.S. HALIOTIS HARGRAVESI, COX. Shell orbicularly ovate, spire much raised, rather thin, flatly depressed in the centre between the spire and the perforations, longitudinally strongly ribbed, with nine to ten ribs, which are flat and coarsely lamellose on the surface, intercostal spaces scarcely scabrous, 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 ly-^inch, breadth T 9^ inch. Hab. Broken-Bay Heads, north coast of N e w South Wales. 7. Note on Ianthella, a n e w Genus of Keratose Sponges. B y Dr. J. E . G R A Y , F.R.S., V.P.Z.S. Several of the older naturalists, as Rumphius (Amb. Rar. t. 80. f. 1), Seba (Thesaurus, iii. t. 95. f. 2-4), and perhaps Petiver (Gazoph. ii. t. 32. f. 1), figure a horny netted marine sponge, for which Pallas (Zoophytes, 320) adopted the name of Spongia jiabel-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 sarcode, 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. ZOOL. Soc-1869, No. IV. |