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Show 1867.] DR. J. E. GRAY ON HYALONEMA LUSITANICUM. 1 1 7 DESCEIPTION OF PLATE XIII. Fig. 1. Trophon hanleyi, p. 110. 2. Cantharus (Tritonidea) unicolor, p. 110. 3. Purpura (Stramonita) neglecta, p. 110. 4. Mitra (Caucilld) strangei, p. 110. 5. Columbella (Mitrella) albomaculata, p. 111. 6. JEwpusfilosus, p. 111. 7. Acus (Abretia) bicolor, p. 111. 8. (Abretia) assimilis, p. 111. 9. Turbonilla nitida, p. 112. 10. Odostomia Icevis, p. 112. 11. lactea, p. 112. 12. (Parthenia)pascoei, p. 112. 13. (Parthenia) kreffti, p. 112. 14. Styloptygma aurantiaca, p. 112. 15. Drillia coxi, p. 113. Fig. 16. Drillia metcalfei, p. 113. 17. Clathurella zonulata, p. 113. 18. Alaba phasianella, p. 113. 19. Bisso'ina variegata, p. 113. 20. turricula, p. 114. 21. smithi, p. 114. 22. cincta, p. 114. 23. Capulus violaceus, p. 114. 24. Eutropia (Tricolia) rosea, p. 114. 25. (Tricolia) virgo, p. 115. 26. Gibbula coxi, p. 115. 27. Gadinia conica, p. 115. 28. Lophyrus smaragdinus, y>. 115. 29. Onithochiton rugulosus, p. 115. 30. Tonicia carpenteri, p. 116. 31. Leucotina esther, p. 116. 32. Chelidonura adamsi, p. 116. 5. Notes on Hyalonema lusitanicum, and on the Genus in general. By Dr. J. E . G R A Y , F.R.S., V.P.Z.S., &c. Professor Bocage having most kindly presented to the British Museum a very beautiful specimen of LTyalonema lusitanicum from the coast of Portugal, I am enabled to state that I believe it to be a most distinct species from the Hyalonema sieboldii of Japan. The bundle of spicules is much more slender, consisting of fewer spicules, and the spicules are very much longer than in any specimens I have seen from Japan; and the sculpture on the surface of the spicules is much more distinct and coarse than that on the Japan spicules of the same thickness. A Japan specimen of two-thirds the length, for example, would contain twice, if not three times, as many spicules, and the coil or rope-like axis would be more than twice the diameter. The polypes on the bark are much smaller, oblong-oval, longer than broad, and more crowded together, and are not of the circular form, nor are they nearly so much raised iu the dry contracted state as those of the usual dry Japan specimens. As remarked by Professor Bocage, the lower, more slender part of the axis is entirely covered with the bark, which is crowded all over to the very end of the base with the contracted polypes. The upper half has lost its bark. As in the Japan species, the spicules of the coil of the upper part of the specimen are thicker than near the base; indeed the spicules of both species gradually increase from the base to near the upper end ; so there can be no doubt that the part covered with the bark is the slender base of the spicules, which in the Japan species is naked and is immersed in the sponge. The examination of Professor Bocage's specimens has satisfied |
