Proceedings of the Scientific Meetings of the Zoological Society of London 1873

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22 DR. J. S. BOWERBANK ON THE SPONGIAD.E. [Jail. 7, Spongiadse,' is very much more largely developed than the subject of our present description ; but several small specimens of C. penicillus that I subsequently obtained are as nearly as possible of the same size and external appearance as those of C. Tyleri. DESCEIPTION OF THE PLATES. PLATE I. Geodia Flemingii, Bowerbank. Pig. 1 represents the type specimen based on a mass of Nullipora and sand, natural size, exhibiting a portion of the irregular groups of oscula. Fig. 2. A view of the reverse of fig. 1, exhibiting a section of the spouge and its hollow interior. Fig. 3. A fully developed attenuato-expando-temate bifurcated connecting spi­culum, magnified 80 linear. Fig. 4. One of the recurvo-ternate spicula, magnified 80 linear. The greater number of these spicula have their shafts very much longer than the one represented. Fig. 5. A fusiformi-cylindrical skeleton-spiculum, magnified 80 linear. Fig. 6. One of the large cylindro-stellate retentive spicula with numerous short radii, magnified 530 linear. Fig. 7. A simple cylindro-stellate retentive spiculum, magnified 530 linear. Fig. 8. One of the small cylindro-stellate retentive spicula, magnified 530 linear. Geodia depressa, Bowerbank. Fig. 9 represents the type specimen in the Museum of the Boyal College of Sur­geons, London: natural size. Fig. 10. Half of one of the large fusiformi-acerate skeleton-spicula, magnified 80 linear. Fig. 11. One of the large attenuato-patenti-ternate connecting spicula with large and long shafts, magnified 80 linear. Fig. 12. A recurvo-ternate connecting spiculum with long and slender shafts, magnified 80 linear. Fig. 13. A n attenuato-stellate retentive spiculum from the interstitial membranes, magnified 530 linear. Fig. 14. One of the small and very numerous cylindro-sphero-stellate retentive spicula from the interstitial membranes, magnified 530 linear. Fig. 15. A n adult ovarium, magnified 230 linear. Geodia gibberosa, Bowerbank. Fig. 16 represents the specimen in tbe possession of Dr. Andrew Fleming, son of the late eminent naturalist Professor Fleming of Edinburgh : natu­ral size. Fig. 17. One of the attenuato-patenti-ternate connecting spicula, magnified 80 linear. Fig. 18. A fusiformi-acerate skeleton-spiculum, magnified 80 linear. Fig. 19. One of the slender acuate skeleton-spicula, magnified 80 linear. Fig. 20. A small fusiformi-acerate tension-spiculum from the interstitial mem­branes, magnified 80 linear. Fig. 21. A n attenuato-stellate retentive spiculum from the interstitial mem­branes, magnified 530 linear. Fig. 22. One of the minute cylindro-stellate retentive spicula, magnified 530 linear. PLATE II. Geodia perarmatus, Bowerbank. Fig. 1 represents the type specimen, natural size. Fig. 2. One of the large fusiformi-acerate skeleton-spicula, magnified 80 linear.