304 B. W. PRIEST ON AN UNDESCRIBED SPECIES OF SPONGE. 



skeleton with the same spicules, along with equi-triclentate anchorate 

 and bi-hamate spicules, as also fasciculi of fine acerate hair-like 

 spicules dispersed through the Sponge. Examined after being in 

 spirit, and then of a light fawn colour. 



We have here the spicules of this Sponge in Figs. 6-10, the 

 bi-clavate fusiform, the acerate fusiform spicule of the fasciculi, the 

 anchorate, and the bi-hamate. 



In conclusion, I have to apologise to Mr. Curties and Mr. 

 Richardson for having been so long in bringing this description 

 before the Club, and to tender my sincere thanks to my friend Mr. 

 Waller for the assistance he has given me in the determination of 

 the Sponge. 



DESCRIPTION OF PLATE XXIII. 



Fig. 1. — Polymastia hiclavata, with fistulas in situ. 



Fig. 2. — Enlarged fistula of same, X 18 diam. 



Fig. 3. — Portion showing arrangement of spicules in fistula. 



Fig. 4. — Vertical section through centre of Sponge, shoAving cavities filled 



with sarcode, X 12 diam. 

 Fig. 5. — Portion of sarcode showing fasciculi of spicules. 

 Figs. 6 and 7. — Bi-clavate spicules of skeleton. 

 Fig. 8.— Acerate spicule of fasciculi. 

 Fig. 9. — Equi-tridentate anchorate spicule of sarcode. 

 Fig. 10. — Bi-hamate spicule of sarcode. 



