PLATE I. 



page. 

 GeocUa and allied Genera. Different forms of acerate spi- 

 cules. \o . . . 27 

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

 showing very wide interior canal. ^^^ 29 

 Scolioraphis? sp. °j" 23 

 Ophiraphidites sp. Different forms of curved spicules, ^j" 28 

 Acuate spicules of Monactinellids. ^J 20 

 Reniera, sp. Cylindrical curved spicules. *jf . 23 

 Reniera, sp. Conical .'•picules , with smooth outer surface 

 and interior canal, '^f . .21 

 Geodia and allied Genera. Small acerate spicules. ^" 27 

 Reniera sp. Spined spicule. ^^> , 21 

 Stelletta ? sp. Siliceous disc showing canals. ^£ . . 40 

 .Stelletta? sp. Siliceous disc with scalloped border. ^^ ' 40 

 Geodia and allied Genera. Siliceous globule. W -jS 

 The same. Globostellate spicules, "j" . 3S 

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

 the canals. "^ 40 

 ^^4'-''. ^9> S° Probably dermal spicule of Lithistid sponge. Fig. 30 shows 



the shaft. 4P g2 



■f'i.S'- S^, 3^ Four-armed anchoring- spicules of Hexactinellid sponge. W 72 



F'g- SS Anchoring spicule of Hexactinellid with six rays. ^-^ 72 



Figs, j^ — 3(> Four-rayed anchoring spicules of Hexactinellid sponge, ^f 72 



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



