1867. j DK. J. K. GRAY ON HYALONEMA LUSITANICUM. 1 1/ 



DESCEIPTION OF PLATE XIII. 



Fig. 1. Trophon hanleyi, p. 110. j Fig. 16. BrilUa metcalfei, p. 113. 



2. Cantkarus (Trifonidea) unico- \ 17. Clafhure/la sonulafa, p. 113. 



lor, p. 110. I 18. Alaba 2ihasianeUa, p. 113. 



3. Purjpara {Stramotiifa) ncgleciu, 19. liissoina variegata, p. 113. 



p. 110. 20. turricula, p. 114. 



4. Mifra{Caucilla)strangci, -p.WO. , 21. srazYA/, p. 114. 



5. Columbella {Miirellct) albomacu- i 22. cincta, p. 1 14. 



lata, p. 111. i 23. Capjilus violaceus, p. 114. 



24. Eutropia (Tricolia) rosea, p. 

 114. 



25. {Tricolia) virgo, p. 115. 



26. G-ibbula coxi, p. 115. 



27. Gadinia conica, p. 115. 



28. Lophgrus smaragdinus, p. 115. 



29. Onithochiton rugulosus, p. 115. 



30. Tonicia carpenteri, p. 116. 



31. Leucotina esther, p. 116. 



32. Chelidonura adamsi,^. 116. 



6. M<opus filosus, p. 111. 



7. ^c;^*- (Abref/a) bicolor, p. 111. 



8. (Abref/a) assimilis, p. 111. 



9. Turbonilla nit Ida, p. 112. 



10. Odostomia Iwvif, p. 112. 



11. /ac^-ea, p. 112. 



12. ( Varthenia) pa^coei, p. 1 12. 



13. {Parthenia) kreffti, p. 112. 



14. Sfgloptygma aurantiaca, p. 112. 



15. Drillia coxi, p. 113. 



5. Notes on Hyalonema lusitanicum, and on the Genus in 

 general. By Dr. J. E. Gray, F.R.S., V.P.Z.S., &c. 



Professor Bocage having most kindly presented to the British 

 Museum a very beautiful specimen of Hyalonema lusitanicum from 

 the coast of Portugal, I am enabled to state that I beHeve 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 speci- 

 mens 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 uot 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 in 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 

 ol 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 



