OP THE SPONGIAD.E. 249 



FIG. 



128. EXPANDO-TERNATE. X 108 linear. From a portion 



of the skeleton of a sponge nearly allied to Ecio- 

 nemia, Bowerbank. The shaft acting as a skeleton 

 spiculum, while the apex serves as an external 

 defence. Locality unknown. 



129. INCURVO-PORRECTO-TERNATE. X 1 OS linear. From 



the same sponge as Fig. 128. The shaft belong- 

 ing to the skeleton, and the ternate apex acting as 

 an external defence. 



130. BIFURCATED EXPANDO-TERNATE. X 108 linear. 



From the same sponge as Fig. 128. The shaft of 

 the spiculum assisting in the formation of the 

 skeleton, while the ternate terminations act as ex- 

 ternal defences. 



131. INEQUI-TRIIIOTULATE. X 660 linear. (See Plate X.) 



Having two terminal rotulse of equal size, and one 

 intermediate of greater diameter than the terminal 

 ones. I have no knowledge of the sponge from 

 which this spiculum is derived. 



132. INEQUI TRIHOTULATI. X 660 linear. (See Plate X.) 



From an undescribed sponge in the cabinet of my 

 friend Mr. George Clifton, Freemantle, Western 

 Australia. This and the following two forms are 

 abundant on the interstitial membranes of the 

 sponge, and vary in form and extent of develop- 

 ment exceedingly. 



133. ECCENTRIC TRIROTULATE. X 660 linear. -(See Plate 



X.) From the same sponge as 132. This specimen 

 is both centrical and eccentrical to a certain extent. 

 Page 45. 



134. ECCENTRIC TRIROTULATE. X 660 linear. (See Plate 



X.) Exhibiting the fully-developed axial eccen- 

 tricity. Page 45. 



135. TORQUEATO-TRIDENTATE INEQUI-ANCHORATE. X 400 



linear. From a circular group on the interstitial 

 membranes of an undescribed species of Hymenia- 

 cidon, from Freemantle, Australia. Page 49. 



