Plate I. 



LaniKjindla pupa 0. t^ciiM. P. 3. 



Figs. 1-3. Tliree specimens in natnral size. Fig. 1, atiachecl tu a dead 



coral. Figs. 1 and 2, with veil over the surface. 

 Fis. 4. Dermal ia in lateral view. 300 x . 

 Fi«'. 5. Same in an early stage of development. 300 x . 

 Fi". G. Part of a large hypodermal pentactin as seen from distal side. 



150 X. 

 Fi"-. 7. Part of a prostal pentactin forming tlie veil ; seen from distal 



side. 150 x . 

 Fig. 8. Gastralia in lateral view. 300 x . 

 Fig. 9. Section of sponge-wall, showing a wide and hranched excurrent 



canal, the chamber-layer with archteocyte-cougeries, etc. Above, 



the dermal side ; below, the gastral side. 50 x . 

 Fig. 10. Parts of the walls of three chambers lying close together. Archj^eo- 



cytes and membrana reticularis very badly represented. Above, 



trabecnlfe arising from chamber-rim. 450 x . 

 F'i-r. II. üiscohexaster. 300 x. 



Fig. 12. Outer end of discohexaster terminal. Highly magnitied. 

 Fig. 13. Plumicome. 300 x . 



(Figs. 4-l;î were all taken iVoni the .speciiiifu shown in fig. 1 [Sei. Cull. 

 Mus. Nu. 2*J9]. For more ligures relating to the s[ieeies, see Cuntrilnitiun ill., 



PI. v.). 



