6 Spong. 
spongle. 
Heteroccela. 
Fam. 1. Syconiclce. 
Subfam. 1. Syconince. Syconiclce with unbranched distally sepa¬ 
rate flagellated tubes, and without complicated 
canal system. (Genera, Sycetta, Sycandra .) 
Subfam. 2. Uteince. Syconidce, the simple unbranched flagellated 
tubes of which have coalesced throughout, so that 
there are no projecting distal cones, but a smooth 
continuous outer surface. No complicated canal 
system. (Genera, Grantessa , Ldf., Ute, 0. S., 
Sycortusa, Ldf., Amphoriscus, H.) 
Subfam. 3. Grantince. (Genera, Grantia, Heteropegma , Anci- 
mixilla.) 
Fam. 2. Sylleibeidce, new. Heteroccela with complicated exhalent 
canal system, connecting the sack-shaped cylindrical 
flagellated chambers with the gastric cavity. 
Subfam. 1. Vosmaerince. Flagellated tubes all situated at the 
same distance from the main axis of the sponge- 
person, radially arranged ; a thick layer of reticu¬ 
late exhalent canals intervenes between the flagel¬ 
lated chambers and the gastral cavity. The iuha- 
lent canals also form a reticulation. (Genus, 
Vosmaeria ; includes Leucetta hackeliana , Pol., and 
L. imperfecta , Pol.) 
Subfam. 2. Polejnce. Flagellated chamber-tubes arranged radi- 
ately to the exhalent canals, and therefore not 
equidistant from the axis of the sponge. Cham¬ 
ber layer not a simple cylinder, but extensively 
folded. (Genus, Polejna ; founded on Leucilla 
uter , Pol.) 
Fam. 3. Leuconidce. (Genera, Leucetta , Leucaltis , Leucortis, Leu- 
candra.) 
Fam. 4. Teichonidce. (Genera, Teichonella , Crtr., Eilhardia , Pol.) 
Schulze (38) gives the following classification of the Hexactinellida :— 
Type, Ccelenterata ; subtype, Spongice. Class, Silicispongice ; subclass, 
Hexactinellida. 
Order I. Lyssacina, Zittel. 
Fam. 1. Euplectelliclcc. 
Subfam. 1. Euplectellince ( Euplectella , Owen, Regadrella , 
O. S.). 
Subfam. 2. Holciscince ( Holascus , g. n., Malacosaccus , g. n.). 
Subfam. 3. Tcegerince ( Tcegeria , g. n., Walteria, g. n .,Habi'o- 
dictyum , Wy.-Th., Eudictyum , Marshall, Dicto- 
calyx, g. n., Rhabdoclictyum , O. S., Rhabclo- 
plectella, 0. S., Hertwigia , O. S ). 
Fam. 2. Asconematiclce. 
Subfam. 1. Asconematince (Asconema, S. Kent,^lwfasc 2 *s, g.n.). 
Subfam. 2. Sympagellince (Sympagella , O. S.). 
