PLATE III. 



p:ige. 



Figs, i , 2 Tethya ? sp. Simple trifid ,zone' spicules 36 



Fig. 3 Geodia ? sp. Compound trifid zone spicule 34 



Fig. 4 Tethya? sp. Simple trifid zone spicule 37 



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



Figs. 6, 7 Geodia? sp. Simple and compound trifid spicules 34 



Fig. 8 Tethya? sp. Simple trifid zone spicule 38 



Fig. g Geodia? sp. Compound trifid spicule 34 



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



Figs, u, 12 Dermal spicules of Lithistids 62 



Figs, is, 14 Tethya? sp. Simple trifid zone spicules 36 



Fig. ij Dermal spicule of Lithistid sp.onge 62 



Figs. 1 6 23 Tisiphonia ? sp. Compound trifid zone spicules. Figs. 17, 

 1 8 , 22 are lateral views showing variously elongated 

 shafts ; in Fig. 2 1 the termination of the shaft is rounded : 



Figs. 1 6, r9, 20, 23 show the Heads of different spicules . 43 



Figs. 24, 25 Pachastrella sp. Quadrifid spicules 45 



Fig. 2.6 Caminus? sp. Three-rayed spicule 48 



Fig. 27 Pachastrella? sp. Three rayed spicule 48 



Fig. 28 Pachastrella primoeva? Zittel. Five armed spicule 46 



Figs. 29 31 Pachastrella Carteri, n. sp. Simple quadrifid spicules ... 46 

 Figs. 32 33 Pachastrella primoeva? Zittei. Quadrifid spicules, arms une- 

 qual and slightly bifurcated 46 



Fig. 34 The same. Five armed spicule 46 



All the figures are drawn by means of the Camera lucid a and to the same 

 scale of 20 diameters. 



