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Gen.n. Leucosolenia. Sponge fistular, formed of a single 
layer of triradiate and other spicula surrounding a large central 
cloaca, which extends into -all parts of the sponge. Type: Grantia 
botryoides Flmg. (= Grantia Schm.) 
Gen. Leuconia Gr. Sponge furnished with cloacae, one or 
more. Parietes of sponge formed ofa mass of irregularly disposed 
interstitial membranes, and triradiate and other spicula; parmeated 
by sinuous excurrent canals, the oscula of which are irregularly 
disposed over the surface of the cloaca. Type: Gr. nivea Flg. 
Gen. n. Leucogypsia. Sponge massive, without cloacae; 
formed of irregularly disposed membranous tissues and spieula. Oscula 
at the external surface. Hieher L. Gossei n. sp. England und L. 
algoensis n. Sp. 
Ord. IH. Silicea. 
Subord.1. Spiculo-radiate seleletons. Not reticulate. Com- 
posed of spicula radiating in faseiculi or separately from the base 
or axis of the sponge. 
Gen. Geodia Lam. Sceleton: spicula fasciculated, radiating 
from the base or central axis of the sponge to the surface. Der- 
mis erustular, furnished abundantly with closely packed ovaria (i.e. 
globali silicei Schm., die Verf., wie die sog. Gemmulae der Spon- 
gillen, für Eierstöcke hält). Ovaria siliceous, composed of cuneiform 
spicula, firmly cemented together by silex, in lines radiating from 
the centre of the ovary. Pores furnished with oesophageal tubes 
terminating in the distal extremity of the intermarginal cavities. 
Intermarginal cavities separate, symmetrical, subeylindrical; each 
furnished with a membraneous valve at its proximal extremity. (Verf. 
kennt von diesem Genus 7 verschiedene Arten.) 
Gen. Pachymatisma Bow. Sceleton composed near the exter- 
nal surface occasionally of short fascieuli of siliceous spicula, dis- 
posed in lines at obout right angles to the surface of the sponge. 
Central portion of the sponge unsymmetrical. Alles übrige wie bei 
Geodia. (Mit drei Arten, unter denen P. Johnstonii n. sp. von 
England.) 
Gen. n. Ecionemia. Sponge having a strong axial column 
or centre of closely packed siliceous spicula disposed in lines pa- 
rallel to the long axis of the sponge, from which axial column or 
centre a peripherical system of spicula radiates at about right an- 
gles. Distal ends of the radii furnished more or less with ternate 
connecting spicula, the radii of which are disposed immediately be- 
neath the dermal membrane. Type: E. acervus n. sp. (Mit Anco- 
rina Schmidt verwandt.) 
Gen. Aleyoncellum Quoy et G. (Euplectella Ow.) Sponge fistu- 
