246 ME. A. W. WATERS OjS^ 



The present form certainly seems to be the Adeonella lichen- 

 oides of Milne-Edwards, who presumably examined the specimens 

 described by Lamarck. It, however, is not the A. lichenoides of 

 Busk's ' Marine Polyzoa,' to whicli he subsequently, in the 

 ' Challenger ' Eeport, p. 180, gave the name tuberculata *, which, 

 will probably be found to be superfluous. The Eschara lichen- 

 oides o£ Heller is no doubt Schizoporella serratimargo, Hincks, 

 also described by JSTeviani as ^S*. sulcata. Neviani now calls it 

 Schizotheca serratimargo, Hincks. {ScMzotheca serratimargo, 

 Hincks, rett. di nomen., Boll. Soc. Geol. Ital. vol. xxiii. p. 270, 

 1904.) 



The spirit-specimen from the Cape Horu Expedition, D. 174, 

 ^' S.E. de rile de Scott," has few pores over the surface, a round 

 median pore, and an avicularium by the side. Milne-Edwards 

 did not speak of the surface pores, and only calls the surface 

 *' lisse " ; however, in other cases where there are pores he did not 

 mention them. At the side of the branches of the Cape Horn 

 specimens the ordinary zooecia are replaced by large avicularia 

 with triangular mandibles, and this is a character of the species. 

 There are 14 tentacles. 



Hah. Indian Ocean {M.-Edwards) ; Tristan da Cunha, 75, 110 

 fath. {Busk) ; Tierra del Fuego (JSusJc). Cape Horn Exped., 

 Station 174, S.E. de I'lle de Scott; and Station unknown. 



* In 1864, Eeuss described and figured an Adeonella from the Mayence 

 Basin as Eschara tetrastoma (Sitzungsb. k. Ak. Wissensch. Wien, vol. 50. 

 p. (9), pi. ii. fig. 2), and the same year Stoliczka figured some much worn fossils 

 from Orakei Bay, New Zealand, as Fliistrella clavata, Stol. I examined a few 

 very small foliaceous fragments from Curdles Creek, S.W. Victoria, whicli I 

 figured as Microporella clavata, Stol., but some better preserved branching 

 specimens were described as M. yarraensis, Waters (Q. J. Greol. Soc. vol. xxxvii. 

 p. 331, pi. XV. figs. 27, 28). JiEacG-illivray, who has since had ample material, 

 says that clavata and yarraensis are synonyms, the species being very variable. 

 This is somewhat surprising, as besides having a different zooecial growth, the 

 zooecial characters seen appeared suflicient to justify separation ; however, as 

 MacGillivray was a very careful observer, we must presume that he was correct 

 (see Tert. Polyzoa Vict. p. 70, pi. ix. figs. 15, 18). About the same time 

 MacGillivray described a recent specimen as Adeonellopsis 'parvipuncta, and here 

 we find the outside or lateral zooecia with an elongate denticulate pore, while 

 the ovicelligerous zooecia have an area with several round denticulate pores. 

 This, to a large extent, explains the difiiculty tliere has been in the determina- 

 tion of the fossils, for the different structure of the two sets of zooecia has. only 

 recently been understood, though first described by -Milne-Edwards. The 

 A. lichenoides, Busk, of the Brit. Mus. Cat., is therefore A. clavata, Stol.= 

 A. yarraensis, Waters=^. paruipuncta, MacGill.=^. tuberculata, Busk = 

 ? A. tetrastoma, Eeuss. 



