BY E. F. HALLMAXN. 313 



49. Verrill, a. E.— "Characteristic Life of the Bermuda Coral Reefs. 



Porifera." Trans. Conn. Acad., xii., 1907, pp. 330-344. 



50. VosMAEK, ii. C J. — "Porifera." Die Klasseii uiul Ordnungeii de.s 



Thierreichs, ii., 1887. 



51. — " The Porifera of tiie fSiboga-Kxpedition. ii.Thc 



Genus Spirastrella." Siboga-Expediiie, Monogr. vi.a, Livr. lix., 



1911, pp. 1-67. 

 52, "Oil the Distiuction between the (jGuera, Ax inell'f, 



Phake/iia, Acan.thella, a.o." Zool. Jahrb. 8uppl. xv., Bd. i., 1912. 

 53. Whitelegge, T. W.— "The Sponges of Funafuti." Mem. Austr. 



Mus., iii., Part 5, 1897, pp. 323-332. 

 54. "Report on Sponges from the Coastal Beaches 



of New South Wales." Rec. Austr. Mus., iv., No.2, 1901, pp.55-118. 

 55. "Supplementary Notes to the Report on 



Sponges from the Coastal Beaches of New South Wales. Op. cil., 



iv., No.5, 1902, pp.21 1-216. 

 56. "Notes on Leudenfeld's Types described in 



the Catalogue of Sponges in the Australian Museum.*' Op. cit., iv., 



No.7, 1903, pp.274-288. 

 57, ■ "Scientific Results of the Trawling Expedi- 

 tion on H.M.C.S. 'Thetis' off the Coast of New South Wales. — 



Sponges." Mem. Austr. Mus., iv., Part 9, 1906, pp.453-486; Part 



10, 1907, pp.487-515. 



EXPLANATION OF PLATES XV. -XXIV. 

 Plate XV. 

 Fig A.— Sollasella digilata Lendenfeld; ( x §). 

 Fig.'2.—Sollasella digitafa Lendenfeld, from the type; ( x §). 

 Fig.3. — Donalia /ssurata Lendenfeld; (slightly reduced). 

 Fig. 4. — Donatia phiUij)e7Viis Lendenfeld ; surface-section showing the 



dermal reticulation, the primary meshes of which are subdivided 



(by lines of tylasters) into smaller meshes, each enclosing a pore; 



( X 18). 

 Fig.o. — SjnraslrtHa{1) audralis Lendenfeld; a tiabellatc example; ( x h). 

 Fig, 6. — Polymastia zilteli, from the type of Sideroderma zittelii Lendenfeld; 



(nearly nat. size). The specimen is in a fragmentary condition. 



Plate xvi. 



Fig. 1. — Cliona {Fa])Ulissa) hixoni, from the type of Raphyriis hixonii Len- 

 denfeld ; portion of the cxteri(U', showing tlie character of the 

 surface-areolation; ( X ^■). 



Fig.2. — Cliona {Papillis'ia) hixoni; showing the skeleton (after maceration 

 by means of caustic potash) of a thick slice of a small specimen; 

 (nat. size). 



