EXPEDITION ANTARCTIQUE BELGE 



Fig. ic. Osthimosia clavata sp. nov. Operculum. X 85. From N° 3^3. 

 \d, e. do do Mandibles. X 85. From N° 343. 



if. do do Ovarium. X 25o. From N° 343. 



ig. do do Vicarious mandible. X 85. From N° 1047. 



2«. Osthimosia evexa Jullien. Mandibles. X 85. From spécimens determined by [ullien 



from Cape Horn. 

 oh. do do Operculum X 85. 



3. Hippothoa divaricata Lamx. X 25. From N° 5g6. 



4. Cellepora signala Busk. x 25. From N° 991. 



5. Escharoidcs biformata sp. nov. X 25. From N° 683. 

 6a, b, c, d. Barcntsia discreta Busk. X IO - From X" g5i. 



6e, f. do do Junction of the polypide with the pedicel. )< 85. 



y a. Alcyonidium antarcticum sp. nov. Showing base of the tentacles with intertentacular 



organ. X 5oo. From N° 774. 

 yb. do do Section of zoœcium showing ovaria. X 2 5o. The 



same zoœcium less magnified is seen in fig. yh. 

 yc. do do with wide zoœcia. X about 3. 



yd. do do do X 25. 



je. do do with narrower zoœcia. X about 3. 



7/. do do Longitudinal section showing ovaria ; tentacular 



organ iSx. (ov) ovaria ; (sp) testes and sperma- 



tozoa ; (ap) aperture. X 85. 

 jg. do do Tentacular organ as seen in fig. y/. X 25o. 



yh. do do Transverse section. X 85. 



8(7. Heteropora claviformis sp. nov. Longitudinal decalcified section. X 85. From N° 619. 

 8b. do do Surface. X 25. 



8c. do do Broken colony. X about 3. 



8d. do do Natural size. 



PLATE VIII 



Fig. i<7. Scrupocellaria funiculata MacG. X 25. From N° 877. 

 16. do di> Scutum. )< 85. 



2<7. Scrupocellaria antarctica nov. Xs5. From N° 347. Showing the denticle (dt) within the 



zoœcium near its base and close to the rosette plate 

 (see PI. I, figs. 5a-e). 

 2b. do do X 85. 



3. Bugula tricornis Busk. Mandible seen from above X 100. Showing the équivalent of 



the cross bar. From N° 616. 

 4a. Cellaria Dennanti MacG. X 25. From N° 242. Showing ovicellar and mandibular 



openings (see PL II, figs. ga-f). 

 5. Cellaria malvincusis Busk. X 85. From New Zealand. 

 on. Cellarinella nodulata sp. nov. X 25. From N° 623. 

 6b. do do Natural size. 



6c. do do Mandibles. X 85. 



