SPONGES. ' 59 



RHAPUroONEMATA. 



l.—Chaliiui inornata (B. S., PL 83.. figs. 12-10, not that of p. 358.) 

 Three apeciraeus. 



EcniNONEMATA. 



2. — Microcioua i>luinosa, Br. olhii. Ibimoiiaridiin ithnnoxu, Bk. (B. S.. 

 PI. '2G, figs. 7-13.) 06<. — This is -Johnston's /falicliondrid plmnnxa, and 

 although it sometimes may appear under a laminilonn growth hke 

 Micivcioita, its habit is to be massive and erect. The equianchorate 

 flesh spicule is "angulate," (B. S., Vol. 1. PI. 6, fig. 143,) not naviculiform 

 as in }ficrociona ntrosdiiiiitiwa, Bk. ; and although the red colour of both 

 species may be alike, the spiculation generally, not only differs, but the 

 pungent (? iodine) odour of Halichondrla plunio.^a is quite sufliciont to 

 detect it even blindfolded. 



HOLOBHAPHIDOTA. 



3. — HalicJiondria panicea (B. S., Pis. 39 and -40.) Several speci- 

 mens. 



4. — Isodictija Norni'ini (B. S.. PI. 56, figs. 1-3.) One specimen. Obs. — 

 I can see very little specific difference between this and I. jucorum and 

 I. Aldcri, illustrated in the same plate. 



0. — None. 



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



7. — Hymeiiiacidon suberea (B. S., PI. 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. 

 Bowerbauk's description, (B. S., Vol. II., 186-1, p. 202, where he states that 

 its absence makes the difference between H. suberea and Il.Jicus. 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 Alcyonhim tuberosum (tab. 13, 

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



8. — Hytneniacidon sanguinea (B. S., PI. 32, figs. 5-8.) Two specimens. 

 06s. — 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. — Trichostemma hemispherfcum, Sai's. (Forms of Animal Life on 

 Norwegian Coast, 1872, p. 62, PI. 6, figs. 1-15.) 06s.— This is a 

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

 robusta both in form and yellow colour. 



CAIiCAKEA. 



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

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

 specimens. 



