374 



Plate V. 



Fig. 1 a. Biigula dentata (Lanix.), from the basal sur- 

 face. The di.stal wall is furnished with two 

 very long desceiiding lateral parts X 40. 



— 1 b. Zod'cia 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. Butitila dissimilis (Busk). X 23. 



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



The strongly angularly bent distal wall is 

 seen. X 17. 



— 2c. A zod'cium of the same species with oce- 



cium, lateral view. X 23. 



— 2d. I'he distal wall of the same species, viewed 



friini above. X 40. 



— 3 a. Stef/anoiiorella neozelanica i Busk\ X 23. 



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



walls are seen (proximally to the first and 

 third rosette-))late); 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 zotrcia of 



the same species. In two of these the dis- 

 tal wall with two multiporous 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. 

 4 b. 



4 c. 



5 a. 

 .5 b. 



,5 0. 



6 a. 

 6 b. 



6 c. 



7 a. 

 7 b. 

 7e. 



7d. 



Steganoporclhi neozelanica Busk), var. mag- 

 nifica. X 23. 



.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 



The same form, lateral view. The same 

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

 Steganoporella maijnilabris (Buskl X 23. 

 The same species, from the basal sur- 

 face. Two rosette-i)lates and a correspond- 

 ing opening are seen. X 17. 

 The same species, lateral view. X 23. 

 Steganoporella Biiski Harmer. X 23. 

 The same species, lateral view. The crypto- 

 cyst joins the basal wall. X 23. 

 A distal wall of the same species. The lines 

 in which the cryptocyst meets the distal 

 wall are seen. 



Steganoporella lateralis (Mac Gilliv.) X 23. 

 The same species. X 23. 

 A zorccium of the same species with cover- 

 ing membrane and operculum. X 23. 

 The same species, from the basal surface. 

 In the two distal zo<rcia the basal wall of 

 the polypide tube is formed by the basal 

 wall of the zooecium. X 23. 



