BETOZOA FROM XEA.R CAPE IIORX. 245 



There are 20-23 tentacles, but the state o£ preservation of 

 the piece I prepared was not favourable for further detailed 

 examination. 



The "pent-house projection" above the aperture is not, as a 

 rule, well marked, but a small projection can be made out on 

 most zooecia. The large reticulation recalls Petralia undata, 

 MacGill., which, from a specimen in the Paris Museum, seems 

 to be the species named Retepora amhigua by Lamarck. 



Loop-shaped openings at the lower corner of the oral aperture 

 may be formed in two ways : firstly, as in the present case, for 

 opercular projections ; secondly, as in Rliagasostoina, where the 

 operculum has a straight lower edge and is carried by the 

 covering membrane over the opesial opening. 



Aspidostoma airensis, Maplestone, 'has been found fossil in 

 Yictoria. 



Sab. Patagonia; Fallcland Islands; Tristan da Cunha, 110- 

 150 fath. (Busk). Cape Horn Expedition, Station unknown ; 

 and between Falkland Islands and the Straits of Magellan, 100- 

 200 metres. [Straits of Magellan, Calvet.l 



Fossil. Victoria {Water's Sf MacGill.) ; South Austi'alia 

 {Waters):, Santa Cruz and Santa Julian, Patagonian formation, 

 as Miocene {Ortmann)^. 



Adeoxella lichenoides {Lamarck). (PI. 28. fig. 12.) 



EscJiara lichenoides, Lamk. Anim. sans Vert. vol. ii. p. 176 (181G) ; 

 Milne-Edwards, ^Sur les Eschares,' p. 31, jjl. 2. fi^^ 3 (1836). 



Adeona punciulata, Jullien, Miss. Sc. du Cap Horn, p. 86, pi. 4. tig-. 6 

 (1888j. 



Adeonella utlantica, Busk, Zool. Chall. Exp. vol x, pt. 30, p. 186, 

 pi. 20. fig. 7, pi. 21. figs. 1, 1 6 (1884) ; Waters, op. cit. vol. xxxi. pt. 70, 

 p. 33, pi. 2. figs. 20, 37. 



plates, by serving as the sign of the way in which this tissue has grown, are 

 of great importance. 



Beania rn(i.gellanica. Busk, has the zooecia distant but connected by tubes, 

 and this shows us how the rosette-plates are formed : processes of the ecLocyst 

 grow at any of the six positions where connecting-tubes may occur and contain 

 growing tissue ; they spread out and join with their neighbours, and at an 

 early stage rosette-plates are formed. An exact drawing of an actual specimen 

 is given in my paper " On the Bryozoa of the Bay of Naples," 1870, Ann. Mag. 

 Nat. Hist. ser. 5, vol. iii. pi. xii. fig. 1. 



[* Canu, in his paper just published on " Les Brjozoaires du Patagonien, 

 Mem. Soc. Geol. de France, vol. xii. p. ] 4.. calls this A. Ortmanni, Canu.] 



