1098 A MONOGRAPH OF THE AUSTRALIAN SPONGES, 



the same dimensions. Towards the outer surface, the spicules 

 become sigittal, the unpaired rays always being longer and 

 pointing outwards. 



Measurement of the dermal quadriradiates and triradiates : 



Centrifugal ray 0-15— 0-18 x 0-006; tangental rays 0-07— 

 0-12 X 0-006. Dermal proti'uding acerates sh-aight, slightly 

 leaning towards the Osculum, cylindrical in the centre end conic 

 at both ends ; the proximal end more abruptly pointed than the 

 distal end. 1-8— 2-5 x 0-021 mm. 



Locality : East Coast of Australia, Port Jackson, " Bottle and 

 Glass," on black mud, 10 fathoms. Ramsay. 



This Sponge, one of the most beautiful in Port Jackson, was 

 provisionally set down by Miklouho-Maclay (manuscript), as 

 Baeria Ramsayi. The Genus Baeria may with further investi- 

 gation be re-established, when we are in a position to replace 

 Haeckel's artificial classification by a more natural one. The 

 specific name has been adopted. 



II. SUB-FAMILY. UTEIN.E. Von Lendenfeld. 



SyconidfB the ciliated tubes of which coalesce throughout, so that 

 there are no projecting distal cones, but a smooth and continuous 

 outer surface. The tubes are simple unb ranched ; no complicated 

 canal system. 



8. GENUS. GRANTESSA. Von Lendenfeld. 



Uteinse with si)arsely scattered bunches of long dermal protrud- 

 ing Acerates, which are not determined in their number or position 

 by the ciliated tubes. Sensitive cells in clustei-s on the inner side 

 of the strictures which surround the inhalent pores. 



18. SPECIES. GRATESSA SACCA. Nov. spec. 



Large sackshaped Uteinse, which do not form colonies and are 

 characterized by the lai'geness of their gastral cavity and the thinness 

 of the body-wall. The sponge attains a length of 80 mm., and has 

 the shape of a straight or slightly curved cylinder, with a circular 

 transverse section, and a diameter of 20 to 25 mm. The body wall 



