DENDY— REPORT ON THE HEXACTINELLID SPONGES (TRIAXONIDA) 223 



DESCKIPTION OF PLATES. 



Plate 40. 

 Figs. 1 — 10 a. Aulocalyx serialis n. sp. 



Fig. 1. Restoration of entire sponge (based mainly on R.N. v. 1). x 2. 



Fig. 2. Part of skeletal framework (R.N. V. 1). x 110. 



Fig. 3. Part of skeletal framework ending in hooks which project into the gastral cavity (R.N. v. 1). 



X 110. 

 Fig. 4. Large parenchymal hexact (R.N. v. 1). x 100. 

 Fig. 5. Small parenchymal hexact (R.N. v. 1). x 320. 

 Fig. 6. Large pentact (R.N. v. 1). x 100. 



Fig. 7. Small pentact with vestige of sixth ray (R.N. v. 1). x 320. 

 Figs. 8, 9. Discohexasters (R.N. v. 1). x 320. 



Fig. 10. Characteristic large hexaster with spiny rays (R.N. v. 1). x 320. 

 Fig. 10 a. End of ray of large hexaster more highly magnified. 



Plate 41. 



Figs. 11 — 18. Heterorete pulchra n. gen. et sp. 



Fig. 11. Part of a colony, x 2. 



pol. parasitic or commensal Anthozoa. 

 Fig. 12. Part of dictyonal framework, as seen in transverse section, showing the transition to the layer 



of scattered and partially fused hexacts {hex.) in the inner portion of the sponge wall, x 100. 

 Fig. 13. Portion of skeletal framework from inner part of sponge wall, showing incorporation of 



discohexasters. x 360. 

 Fig. 14. Spiny-rayed hexact. x 540. 

 Fig. 16. Oxyhexaster. x 540. 

 Fig. 16. Discohexaster. x 640. 



Fig. 17. Transverse section of sponge wall, showing soft tissues and canal system. (Combined drawing.) 

 x50. 



d.m. dermal membrane ; e.c. exhalant canal ; f.o. flagellate chambers ; g.m. gastral membrane ; 

 Uyd. hydroid polyp ; i.e. inhalant canal; i.t.l. inner (subgastral) trabecular layer; o.t.l. outer 

 (subdermal) trabecular layer. 

 Fig. 18. Part of inner portion of a transverse section showing soft tissues, more highly magnified 

 (Zeiss D. oc. 2). 



disc, discohexaster ; hex. hexacts. Other lettering as before. 



Plate 42. 

 Figs. 19 — 31. Sarostegia ocidata Topsent. 



Fig. 19. The largest piece of the sponge. Nat. size. 



col. collars of sponge tissue surrounding parasitic or commensal polyps (pol.). 

 Figs. 19 a, 19 6. Two other pieces, showing ends of branches. Nat. size. 

 Figs. 19 c, 19 d. Portions of two hollow branches showing apertures (ap.). Nat. size. 



