914 MARINE BIOLOGY OF THE SUDANESE RED SBA. 
(2a) Denpy, A.—“ Studies on the Comparative Anatomy of Sponges: Lelapia.” - 
Q. J. M.S. vol. xxxvi. 
(3) Denpy, A.—“ Report on the Sponges collected by Prof. Herdman at Ceylon in 1902.” 
Report of the Pearl Oyster Fisheries at the Gulf of Manaar, Pt. i. Royal 
Society, 1905. 
(4) Ex.is, J., and D. C. SoranpER.—“ Zoophytes.” 
(5) Grant, R. E.—“ Remarks on the Structure of some Caleareous Sponges.” Edinburgh 
New Philosophical Journal, Vols. i. & ii., 1826. 
(6) Gray, J. E.—“ Notes on the Arrangement of Sponges, with descriptions of some new 
genera.” Proc. Zool. Soc. 1867. 
(7) Gray, S. F.—“ A Natural Arrangement of British Plants,” Vol. 1., 1821. 
(8) Harcxet, E. H.—*‘ Die Kalkschwimme,” 1872. 
(9) Jenkin, F.—National Antarctic Expedition : “ Report on the Calcarea.” 1908. 
(10) Jounston, G.—“ British Sponges and Lithophytes.”” 1842. 
(11) MrxitucHo-Mactay, N.—“ Beitrage zur Kenntniss der Spongien.” Jenaische Zeit- 
schrift, iv. 1868. 
(12) Mincutn, E. A.‘ Sponges.” Lankester’s “Treatise on Zoology,” Vol. ii., 1900. 
(13) Montagu, G.— Essay on Sponges.’”? Wernerian Memoirs, Vol. ii., 1818. 
(14) Portisanrr, N.— Report on the Calcarea collected by H.M.S. Challenger.” 1883. 
(15) Scumipt, O.—“ Die Spongien des Adriatisches Meeres,” 1862-1866. 
(16) ScHurrnrr, O.—“ Beschreibung eines neuer Kalkschwimme.” Jenaische Zeitsch. f. 
Naturw. v. der medicinisch-naturwissenschaftlichen Gesellschaft zu Jena, vol. xi., 
1877. 
(17) SurrH, G.—“ On the Anaspidacea, living and fossil.” Q. J. M.S. vol. lil. 
(18) Taackrr, A. G.—*On Collections of Cape Verde Islands Fauna made by Cyril 
Crossland, 1904. ‘The Calcareous Sponges.” Proc. Zool. Soc. 1908. 
(19) von EBNER, V.— Ueber den feineren Bau der Skelettheile der Kalkschwamme &e. ’ 
Sitz. der kais. Akad. der Wissensch., Bd. xcy. Abt. i., 1887. 
(20) Mincuin, E. A.—“ Materials for a Monograph of the Ascons.” Q. J, M.S. vol. lit, 
1908. 
EXPLANATION OF THE PLATES. 
PLATE 19. 
Fig. 1. Grantilla quadrwadiata. External form. X2. 
2. > > Transverse section through sponge-wall. x60. 
3. x hastifera. YExternalform. X2. 
4, x > Transverse section through sponge-wall. x 60. 
5. Grantessa glabra. External form. X2. 
6. ¥ 5 Transverse section through sponge-wall. x60. y 
PLATE 20. 
o, 7. Leucilla intermedia. Transverse section through sponge-wall. X60. _ 
8. Kebira uteoides. Externalform. x6. 
9 
“5 ~ Longitudinal section through sponge-wall. x 60. 
LETTERING oF Fias, 2, 4, 6, 7, 9. 
d.c., dermal cortex. g.c., gastral cortex. 
e.c., exhalant canal. @.¢., inhalant canal. 
- fi.c., flagellated chamber. s.d.c., sub-dermal cavity. 
sp.f., spicular fibres (composed of ‘nail-spicules ”). 
