REPOET ON THE TETRACTINELLIDA. 
209 
Habitat . — Prince of Wales Channel, Torres Strait ; depth, 5 to 7 fathoms ; bottom, 
sand and shells. 
Remarks . — As according to Eidley the oxeas of this sponge are not collected into 
distinct fibres, it remains doubtful how far we are correct in assigning it to the genus 
Coppatias. But till the anatomy of the species belonging to this genus has been 
investigated, the position of all must be regarded as uncertain. 
Demus III. Sterrastrosa. 
Astrophora in which the characteristic microsclere is a sterraster. 
Family I. G e o d 1 1 d 
Sterrastrosa possessing trisene megascleres. 
Subfamily 1. Erylina. 
The megascleres are orthotrisenes and rhabdi ; anatrisenes and protrisenes are absent. 
The somal microsclere is a diactinose aster (microrabd) or spherule. 
Genus 1. Erylus, Gray. 
The sterraster is seldom spherical ; the somal microsclere is a centrotylote micro- 
rabd. The incurrent chones are uniporal ; and the oscule is the patent opening of a 
cloaca. 
Erylus formosus, Sollas (PI. XXVIII.) . 
Erylus for mosus, Sollas, Prelim. Account, Sci. Proc. Roy. Dubl. Soc., vol. v. p. 195, 1886. 
Sponge (PI. XXVIII. figs. 1, 2). — Of irregular form, tending to grow into lobes and 
ridges, attached. Oscules round, situated on the top of ridge-shaped growths, or at the end 
of lobes, few. Pores comparatively large, with slightly everted margins, scattered separately 
over the surface, not collected into special areas ; each is the single distal opening of an 
in current chone. The oscules lead into cloacas wider than themselves ; the cloaca is 
divided below by vertical membranous partitions into large, excurrent canals. 
Spicules . — I. Megascleres. 1. Oxea (PL XXVIII. fig. 3), fusiform, usually curved, 
not sharply pointed, 0'892 by 0'0237 mm. 
(ZOOL. CHALL. EXP. — PART LXIII. — 1887.) 
Err 27 
