PLATE III. 



Figures 1, 2. — L&ucosolenia poterium, Hseckel, sp. 



Fig. 1. Portion of a section through a colonial specimen, showing a 



spermospore lying in the mesoderm, 

 Fig. 2. A spermospore with ripe spermatozoa, . 



„ 3. — Levcosolenia blanca, Miklucho-Maclay. 



Large coarse-grained amoeboid cells of the peduncle, 



„ 4. — Leucosolenia challenger}, n. sp. 



(a) A triradiate spicule from the interior part of the colony, 



(b) A triradiate spicule from the outer surface, . 



(c) Do. profile view, .... 

 {d, e) Do. embryonal, .... 



„ 5. — Si/eon arcticum, Hseckel. 



Portion of a horizontal section, showing the course of the radial tubes 

 and intercanals, ..... 



x 

 x 



Diam. 



500 

 1200 



500 



x 400 



x 400 



x 400 



x 400 



50 



6-13. — Gfrantia tuberosa, n. sp. 



Fig. 6. Portion of a horizontal section, 



Fig. 7. Portion of the wall of a radial tube with its pores, 



Fig. 8. Gastric quadriradiate spicules (b, embryonal), 



Fig. 9. (a) A subgastric triradiate spicule, 



(b) A subgastric quadriradiate spicule, . 



Fig. 10. Tubar triradiate spicules (b, c, embryonal), 



Fig. 11. Acerate spicules (b, embryonal), 



Fig. 12. Sagittal triradiate spicules of the cortex (a, embryonal), 



Fig. 13. Irregular triradiate spicules of the cortex, 



x 

 x 



X 

 X 

 X 

 X 

 X 

 X 

 X 



50 

 400 

 200 

 200 

 200 

 200 

 200 

 200 

 200 



