. The Quarterly journal of the Geological Society of London. honia, as exposed on the surfaceof the specimen shown in PI. XXV. fig. 3. (X60.) Fig. 8. Specimen of the recent Lithistid sponge Discodermia po7ydiscus, Bocage,preserved in the British Museum, o. The oscules opening into theinterior of the cup ; internal view. 8 a. External aspect of the samespecimen. (Nat. size.)[Figs. 8 and 8 a are from sketches furnished me by Mr. Carter.] Fig. 9. One of the dermal spicules of the preceding, seen in place, exhi-biting the characteristic central triradiate canal. 9 a. Profile view ofthe preceding.

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. The Quarterly journal of the Geological Society of London. honia, as exposed on the surfaceof the specimen shown in PI. XXV. fig. 3. (X60.) Fig. 8. Specimen of the recent Lithistid sponge Discodermia po7ydiscus, Bocage,preserved in the British Museum, o. The oscules opening into theinterior of the cup ; internal view. 8 a. External aspect of the samespecimen. (Nat. size.)[Figs. 8 and 8 a are from sketches furnished me by Mr. Carter.] Fig. 9. One of the dermal spicules of the preceding, seen in place, exhi-biting the characteristic central triradiate canal. 9 a. Profile view ofthe preceding. (X60.) Fig. 10. Dermal spicule from the spicule-bed of the Haldon Greensand. (X7o.)(After Carter, Fossil Sponge-spicules of the Greensand comparedwith those of existing Species, Ann. & Mag. Nat. Hist. ser. 4, vol. ^ii. fig. 5). Fig. 11. Dermal spicule from the network of Siphonia costata, Lamx. ( x60.) Discussion. Mr. Charleswoeth remarked that, if the consolidation of generaproposed by Mr. Sollas were satisfactorily established, it must be re-.

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Keywords: ., bookcentury1800, bookdecade1840, bookidquarte, booksubjectgeology