206 PROCEEDINGS OF THE ACADEMY OF [1884. 



branches, compressed interuniting, roughened by small projecting 

 processes. Consistence now hard. Color whitish gray, spicules 

 of two forms, viz. : 1, large acerate, smooth, 40 by 2 — 1800 in. ; 2, 

 small acerate, spinous, partly in and partly out of the fibre, pro- 

 jecting echinatingly from the surface. 



Ord. YI. HOLORHAPHIDOTA. 

 Fam. 1. RENIERIDA. 

 Group 1. Amorphozoa, 

 No. 5. Halichondria panicea, Bk., attached to sea-weed, covered 

 with white Melobesia. 



No. 12. Halichondria panicea, Bk. 

 No. 34. Halichondria panicea, Bk. 

 No. 58. Halichondria panicea, Bk., much worn. 



Fam. 2. ISODICTYOSA. 

 No. IT. Isodictya, Bk. ? sp. Fragment of a branch. Con- 

 sistence crumbly. Color white. Spicule acerate, 11 by | — 1800 

 in. (Where the spicule is acerate, which is generally the case, 

 the species ai'e ill-defined, as yet.) 



Group 3. Thalyosa. 



No. 48. Reniera? sp. Fragmentofacylindrical, solid branch, 



in which the fibre is entirely composed of small acerate spicules, 

 about 13-1800 in. long. (These species, for the foregoing reason, 

 are, as yet, ill-defined , except where their general form is peculiar.) 



No. 49. The same. 



Group 6. Halichondrina. 



No. 32. Halichondria incrustans, Mihi. Yariety with "angu- 

 lated " (Bk.) anchorate and smooth acuate. Consistence crumbly. 

 Color white. Fragment massive, attached to a dark green, dry, 

 gelatinous, now hardened mass, which, if not one of the " Carnosa," 

 is probably the remains of a compound tunicated ascidian. 



Suberites par excellence. Groups 10, 11 and 12. Cavernosa, 

 Compacta, Laxa. 



10. Cavernosa. 



No. 3. Suberites? sp. Fragment useless for general form, as 



the whole is broken down into a mass of spicular pulp and fibre. 

 Color yellowish. Spicule of one form onl}^, viz., pin-like; shaft 

 smooth, slightly fusiform and curved ; head oval ; size, 30 by 

 1—1800 in. (? = No. 18.) 



