Synopsis of the Australian Calcarea Heierocoila. 79 



3. Sycetta primUiva, Ha?ckel. 



Si/cetta prlmitiva, Hseckel, Die Kalkscliwanime, Vol. II, 

 p, 237. 



Locality. — Bass Straits, Gulf of St. Vincent (Hasckel). 



4. Sycon coroiiatum, Ellis and Solaiider, sp. 



Spongia coronata, Ellis and Solander. Zoophytes, p. 190. 



Grantia ciliata, auctoruni. 



Sycandra coronata, Hseckel. Die Kalkschwamme, Vol. II, 

 p. 804.. 



Locality. — East coast of Austi-alia (Hc>3ckel. Also recorded 

 from the Mediterranean, Atlantic and Pacific). 



5. Sycon carteri, n. sp. 



Colonial; consisting of very many small Sycon individuals 

 united in a copiously branching, bushy mass ; branching 

 irregular. Sycon individuals about 5 mm. in length b}' 

 15 mm. in diameter; cylindrical; with minutely conulose 

 surface and naked, terminal oscula. 



Canal-system typical ; chambers thimble-shaped, rather 

 short, with freely projecting distal cones. 



Skeleton ai-ranged in typical manner-. Spicules as 

 follows: — (1) Gastral quadriradiates ; sagittal; oral rays 

 shorter and stouter than basal, slightl^y recurved, gradually 

 sharp-pointed, measuring Oil x 0()07 mm.; basal ray 

 rather more slender, straight, very gradually sharp-pointed, 

 about 0"2 mm. long ; apical ray variable, stout, more or less 

 curved, often angulate, gradually sharp-pointed, about 

 0'077 nim. long. (2) Gastral triradiates ; like the quadri- 

 radiates but without the apical ray. (3) Subgastral sagittal 

 triradiates ; oral rays extended almost in a line, gradually 

 sharp-pointed, measuring about 0*06 x 0007 mm. ; basal 

 ray veiy long (0175 mm.), straight, gradually sharp-pointed, 

 extending for more than half the length of the chamber and 

 forming by itself about half of the articulate tubar skeleton. 

 (4) Ordinary tubar triradiates ; like the last but with 

 shorter basal ray and oral angle diminishing towards the 

 distal cone. (o) Oxea of the distal cones ; rather shoi't 

 and stout, angulate, with shorter and stouter outer, and 

 longer and slenderer inner segments ; fairly sharp-pointed at 

 both ends ; measuring about 15 x 001 mm. 



Locality. — St. Vincent's Gulf, S. Australia, (coll. Adelaide 

 Museum). 



