PLATE III. 



page, 



Fi:^s. I, 2 Tethya? sp. Simple trifid ,7.one' spicules . . 36 



P':^- 3 Geodia ? sp. Compound trifid zone spicule . . 34 



Fi:^'. 4 Tethya? sp. Simple trifid zone spicule . 37 



Fit;. J Tethya? sp. Simple trifid zone spicule . 3 7 



Fig-s. 6, 7 Geodia ? sp. Simple and compound trifid spicules . . 34 

 Fi^. 8 Tethya? sp. Simple trifid zone spicule ... -3^ 



Fig. g Geodia? sp. Compound trifid spicule . . 34 



Fig. 10 Tethya? sp. .Simple trifid zone .spicule 37 



Figs. II, 12 Dermal spicules of Lithistids ... 62 



Figs. IS, 14 Tethya? sp. Simple trifid zone spicules. . 3^ 



Fig. ij Dermal spicule of Lithistid sponge .... 62 

 Figs. J 6 — ^j> Tisiphonia ? .sp. Compoitnd trifid zone spicules. Figs. 17, 

 1 8 , 22 are lateral views showing variously elongated 

 shafts; in Fig. 21 the termination of the shaft is rounded; 



Figs. 16, rg, 20, 23 show the Heads of different .spicules . 43 



Figs. 24, 2j Pachastrella sp. Quadrifid .spicules . 45 



Fig. 26 Caminus? sp. Three-rayed spicule . . 48 



Fig. 2^ Pachastrella? sp. Three rayed spicule. ... 48 



Fig. 28 Pachastrella primoev.i? Zittel. Five armed spicule . 46 



Figs. 2q — ■j'7 Pachastrella Carteri, n. sp. .Simple quadrifid spicules 46 

 Figs.j2 — js Pachastrella primoeva? Zittel. Quadrifid spicules, arms une- 

 qual and slightly bifurcated . . . .46 



Fig, S4 The same. Five armed spicule. 46 



All the figures are drawn by means of the Cimera Uicida and to the same 

 scale of 20 diameters. 



