152 Leuckai^t: Bericht üb. d. Leist. in tl. Naturgescliiclite 



late; fistula single, elongate, without massive base. Sceleton: pri- 

 mary fasciculi radiating from the base in parallel straight or slight- 

 ly Spiral lines; secondary fasciculi at right angles to the primary 

 ones. Oscula congregated, with or without a marginal boundary 

 to their area. A. aspergillum Ow. u. a. 



Gen. n. Polymastia. Sceleton a basal mass; central por- 

 tion consisting of a plexus of contorted anastomosing fasciculi, re- 

 solving themselves near the surface into short straight bundles dis- 

 posed at nearly right angles to the surface. Oscula congregated, 

 elevated on numerous long fistulae. Fistulae composed of nume- 

 rous parallel fasciculi, radiating from the base to the apex of each 

 in straight or slightly spiral lines. Type: Halichondria fistularis Fl. 



Gen. n. Haly phy sema. Sponge consisting of a hollow ba- 

 sal mass wrhich emanates a single cloacal fistula. Sceleton: spicula 

 of the base disposed irregularly; spicula of the fistula disposed 

 principally in lines parallel to the long axis of the sponge, without 

 fasciculation. Type: H. Tvmavoimczii n. sp.. der kleinste Schwamm 

 der englischen Küste, nicht grösser als V". 



Gen. n. Ciocalyp t r a. Sceleton composed of numerous clo- 

 sed columns, each consisting of a central axis of compact, irregu- 

 larly elongated reticulated structure, from the surface of which ra- 

 diate, at about right angles, numerous short sim^Dle cylindrical pe- 

 dicels, or stout fasciculi of closely packed spicula; the distal ends 

 of each pedicel separating and radiating in numerous curved lines, 

 which spread over the inner surface of the dermal membrane, se- 

 parating and sustaining it at all parts, at a considerable distancc 

 from the central axis of the sceleton. Sp. n. C. penicillus. 



Tethea Lam. Sponge massive, suborbicular, Sceleton consi- 

 sting of fasciculi of spicula. Fasciculi radiating from a basal or 

 excentrical point to the surface. Intermarginal cavities unsymme- 

 trical, confiuent. Propagation by internal gemmulation. (Scheint in 

 der Fassung unseres Verf. ausser den echten Tetheen auch andere 

 rindenlose Arten zu enthalten.) 



Gen. n. Halicnemia. Sceleton formed of a single superior 

 Stratum of spicula radiating from the centre to the circumference 

 of the sponge at about its middle, and of an inferior Stratum of 

 spicula distributed without ordre. 2 Arten. 



Gen. n. Die ty ocylitidrv s. Sceleton without fibre. compo- 

 sed of a loosely compacted axis of spicula, disposed principally in 

 the direction of the line of the axial column, from which a peri- 

 pherical System of long single or fasciculated defensive spicula ra- 

 diate at right angles to the axial column. Type: Hai. damicornis 

 Mont. (= Axinella Schm.). 



