374 



Plate V. 



Fig. 1 a. Bugula dentata (Larax.), from the basal sur- 

 face. The distal wall Is furnished with two 

 very long descending lateral parts. X 40. 



— lb. Zooecia of the same species, lateral view. 



One of the distal wall's lateral parts with 

 its rosette-plates (d. w.) is seen. X 40. 



— 2 a. Bugula dissimilis (Busk). X 23. 



— 2 b. The same species, from the basal surface. 



The strongly angularly bent distal wall is 

 seen. X 17. 



— 2 c. A zocEcium of the same species with ooe- 



cium, lateral view. X 23. 



— 2d. The distal wall of the same species, viewed 



from above. X 40. 



— 3 a. Sieganoporella neozelanica (Busk). X 23. 



— 3 b. The same species, lateral view. Two distal 



walls are seen (proximally to the first and 

 third rosette-plate); in a line with the se- 

 cond and the fourth rosette-plate the polyp- 

 ide tube and an opesiular outgrowth are 

 visible. X 23. 



— 3 c. Four opercula of the same species. X 40. 



— 3d. Transverse section through four zooecia of 



the same species. In two of these the dis- 

 tal wall with two raultiporous rosette-plates 

 are seen and in the two others a trans- 

 verse section of the polypide tube and of 

 the long canal which meets its frontal wall. 

 X 23. 



Fig. 4 a. Steganoporella neozelanica (Busk), var. mag- 

 nifica. X 23. 



— 4 b. The same form, from the basal surface. The 



polypide tube and the lines in which the 

 two opercular outgrowths meet the basal 

 surface are seen. X 17. 



— 4 c. The same form, lateral view. The same 



parts as in Fig. 3 b are seen. X 23. 



— 5 a. Steganoporella magnilabris (Busk). X 23. 



— 5 b. The same species, from the basal sur- 



face. Two rosette-plates and a correspond- 

 ing opening are seen. X 17. 



— 5 c. The same species, lateral view. X 23. 



— 6 a. Steganoporella Buski Harmer. X 23. 



— 6 b. The same species, lateral view. The crypto- 



cyst joins the basal wall. X 23. 



— 6 c. A distal wall of the same species. The lines 



in which the cryptocyst meets the distal 

 wall are seen. 



— 7 a. Steganoporella lateralis (Mac Gilliv.) X 23. 



— 7 b. The same species. X 23. 



— 7 c. A zooecium of the same species with cover- 



ing membrane and operculum. X 23. 



— 7 d. The same species, from the basal surface. 



In the two distal zooecia the basal wall of 

 the polypide tube is formed by the basal 

 wall of the zooecium. X 23. 



