SPONGES. 195 



6. — Rhaphiodesma Jloreum (B. S.,P1. 37, figa. 14-19.) One specimen. 



7. — Hymeniacidon suberea (B. S., PL 36, figs. 1-4.) One specimen. 

 Obs. — The sponge here, as is often the case, has replaced the form of the 

 shell with its own substance. The centrally inflated minute flesh 

 spicule has been omitted in the illustration, in accordance with Dr. 

 Bowerbank's description, (B. S., Vol. II., 1861, p. 202, where he states that 

 its absence makes the difference between H. suberea and H.Jlcus. But 

 it is not so, for it is equally present in both species, as Johnston's type- 

 specimen in the British Museum testifies, and every other specimen that 

 I have met with on the south coast of Devon, where it is very common, 

 as apparently elsewhere, for from Esper downwards all Spongologists 

 seem to have met with it. Esper called it Alcyonium tuberosum (tab. 13, 

 figs. 1-6, ed. c, 1794.) 



8. — Hymeniacidon sanguinea (B. S., PL 32, figs. 5-8.) Two specimens. 

 Obs. — This is abundant on the south coast of Devon, and, with Halichon- 

 dria panicea, the hardiest of all sponges, as they frequently grow nearly up 

 to high water mark, and are, therefore, uncovered for some hours during 

 the fall of the tide. 



9. — TricJwstemma hemisphericum, Sars. (Forms of Animal Life on 

 Norwegian Coast, 1872, p. 62, PL 6, figs. 1-15.) Obs.— This is a 

 specimen of Dr. Bowerbank's genus Polymastia, and very like his P. 

 robusta both in form and yellow colour. 



Calcarea. 

 10. — Grantia compressa (B. S., PL 1.) Two specimens. 

 11.— G. ciliata, Fleming, 1828 (B. S., PL 2, figs. 1-15.) Two 

 specimens. 



12. — G. tessellata (B. S., figs. 21-27.) Several specimens. 



13. — Leucosolenia contorta, Br. (B. S., PL 3, figs. 5-10.) Two 

 specimens. Obs. — Dr. Bowerbank's illustration of the linear spicule (fig. 10) 

 is defective. There are two forms quite different from each other and 

 from Dr. Bowerbank's figure. See Haeckel's " Die Kalkschwamme," 

 under the name of Ascandra contorta, " Atlas," tab. 14, fig. 6, &c. 



14. — Sycon rhaphanus, Schmidt. (Spongien Adriat, Meeres, 1862, s. 

 14, tab. 1, fig. 2.) Two specimens. 



Other Organisms, &c. 



15. — Chirodota digitata (Echinoderm Synaptidas) and Compound 

 tunicate, gelatinous without spicules, (Synascidise Giard.) ? sp. Obs. — 

 Examine the surface of the Chirodota under water with lin. focus and 

 high ocular to see the anchorlike calcareous spicules, which are beautiful 

 objects under the microscope. 



16. — Besidue at the bottom of the jar, chiefly consisting of minute 

 Foraminifera. 



Observations. 



The specimens of Calcispongise are very good, and well worth 

 preserving. Prof. Hfeckel's work entitled "Die Kalkschwamme" is 

 essential for studying the species. 



