PEATE? TV. 
figs. i—g Lyidium Zitteli n. sp. Detached spicules of various forms ; 
in Figs. 1, 3, spicules are shown naturally attached together 
figs. zo—r2 Lyidium cretacea n. sp. Detached spicules. Seas 
fig. 13 The same. Fragment of the skeleton showing four spicules 
naturally attached together 
figs. 14—23 Detached spicules of Carterella, sp. Pn Tork Nee 
figs. 24—30 Ragadinia annulata, n. sp. Various forms of the surface 
spicules , SS Mice De 
Figs. 31—34 Racodiscula Ste allied cae Surface spicules. 
figs. 35—42 Plinthosella squamosa, Zittel. Detached and combined spicules 
of the skeleton. Figs. 36, 40, 42 show fragments in which 
the spicules are combined together Be PAM cn, UE 
Figs. 43—46 The same. Differently shaped spicules of the wdtfaee layer 
of this sponge 
page. 
51 
54 
54 
54 
58 
60 
56 
56 
All the figures on this Plate are drawn to the same scale of 20 diameteis by 
means of the Camera lucida. 
