NOTOPLITES 349 



frontal surface of the branch (Fig. 12 C). The long, slender mandible is usually directed 

 obliquely and is strongly arched, its articulation being on a level with the frontal surface 

 of zooecium F, its tip lying basally to zooecium G (Fig. 12 D). In two instances the 



Fig. 13. A. Notoplites elongatus (Busk). St. 1563, Marion Island. Ancestrula and first three zooecia. The 

 dotted line indicates a break in the ancestrula. Two of the rootlets are attached to a stone. B. N. klugei 

 (Hasenbank). National Antarctic Expedition, McMurdo Sound. Bud and parts of neighbouring 

 zooecia. C. N. tenuis (Kluge). St. TN 339, Ross Sea. Showing ancestrula. 



b. bud, p.c. supposed pore-chamber, r. rootlets, z. proximal zooecium. 



axillary avicularium was seen to be placed symmetrically in the axil with the mandible 

 directed basally, but this position is exceptional. As Calvet mentions that his speci- 

 mens from Patagonia had axillary avicularia, they presumably belong to this variety. 



