5G6 ME. n. N. RIDLEY ON THE 



24. Alctonium. — Congregated, short, columnar individuals ; 

 constricted circularly throughout the column. 



25. EuspONGiA ("Honeycomb spouge " of commerce). — Coarse 

 cavernous structure. 



26. EusPONOiA. — Ditto. 



27. Geodia, same as No. 11. — Eragmeuts uf skin and body- 

 substance only. 



28. DoNATiA LYNCUBIUM. — Eour speciincus ; tlie largest ^ in. 

 in diameter. 



29. PoLTTHEESES, with skeletal structure of Hircinia pro- 

 truding. 



30. Edspongia (" Honeycomb sponge " of commerce). — 

 Coarse cavernous structure. 



31. SuBERiTES MASSA, Sdt. — Spicule of one form only, simply 

 pin-like, with subglobular head. Eight fragments. Surface 

 warty. Colour yellowish. 



32. AxiNELLA ? species. — Form of specimen globular, about 

 an inch in diameter, composed of radiating, erect, tough libre, 

 charged throughout with projecting tufts of simply acuate 

 curved spicules ; of one form only. 



33. Tethya ceanium. — Two small, discok)urcd, black frag- 

 ments. 



31. Chondeopsis aeenifeea. — Specimen triangular, elongate ; 

 4 inches long. Bearing Polytrema and Melohesia. 



35. EuspoNGiA (" Honeycomb sponge " of commerce). — 

 Coarse, cavernous structure. Three pieces. Colour black above, 

 light sponge-yellow below. 



36. Chondeopsis aeenifeea. — Good, but small typical speci- 

 men. 



37. ? Hymeniacidon sangtjinea, jBA;.— Small insignificant 

 specimen. Spicule of one from only, viz. pin-like and slightly 

 curved. Colour now yellowish. 



38. Leuconia sacculata, n. sp. (Calcisponge). — Form of 

 specimen sacculated, consisting of four or more inflations 



