PLATE I. 



page. 

 Figs, j 3 Geodia and allied Genera. Different forms of acerate spi- 



cules. 2 T 27 



Fig. 4 Geodia clavata , n. sp. Shaft , probably of trifid spicule 



showing very wide interior canal. 2 T 29 



Fig- 5 Scolioraphis ? sp. 2 T 23 



Figs. 6 9 Ophiraphidites sp. Different forms of curved spicules. 2 T 28 



Figs. 10 75 Acuate spicules of Monactinellids. 2 T 20 



Figs. 16, 17 Reniera, sp. Cylindrical curved spicules. * r 23 



Figs. 18, 79 Reniera, sp. Conical spicules , with smooth outer surface 



and interior canal. 2 T 21 



Figs. 20, 21 Geodia and allied Genera. Small acerate spicules. j . . 27 



Fig. 22 Reniera sp. Spined spicule. 6 r 21 



Fig' 23 Stelletta? sp. Siliceous disc showing canals. 6 f .... 40 



Fig. 24 Stelletta? sp. Siliceous disc with scalloped border. 6 r . . 40 



Fig. 25 Geodia and allied Genera. Siliceous globule. 6 T ... 38 



Figs. 26, 27 The same. Globostellate spicules. 6 r 38 



Fig. 28 Stelletta? sp. Siliceous disc, imperfect at the edges ; showing 



the canals. 6 j 40 



Figs. 29, jo Probably dermal spicule of Lithistid sponge. Fig. 30 shows 



the shaft. \ 62 



Figs, 31, 32 Four-armed anchoring spicules of Hexactinellid sponge. 6 T 72 



Fig. 33 Anchoring spicule of Hexactinellid with six rays. 6 ^ . . 72 



Figs. 34 36 Four-rayed anchoring spicules of Hexactinellid sponge. ^ 72 



All the figures are drawn by means of the Camera lucida. 



