PLATE XXIII. 



Fig. i6o. Bathyphvsa Sibogae nov. spec. (Cat. 5). Natural size, i — 32, indications of detached (except 21, 



23) siplions on tlie stem. 

 Fig. 161. Pneumatophore and youngest appendages of the stem of the same. 1,5 X- 

 Fig. 162. One of the youngest siphons of the same [x in fig. 161) enlarged. 13 X- 

 Fig. 163. Tentacle and tentilla of the same (Tentacle of the 21st siphon). 15 X- 

 Fig. 164. The largest tentillum of Fig. 163 enlarged. 56 v. 

 Fig. 165. Transverse median section through a siphon of Pterophysa (Bathyphysa) Stiideri nov. spec. 



(Cat. 6). 14 X. 



