494 Mr. A, W. Waters on a Structure in 



generally adopted, even if some limitations have to be made. 

 The group without a zocecia) pore presents more difficulties 

 and my suggestion was that it alone should be called 

 Adeoneila, and it has efen been doubted whether it should 

 remain in the same family. 



Mr. Hincks criticised my ])lacing A. polf/stomella, Rss., 

 with the group, but his criticism seems to be based upon a 

 misapprehension : one reason he gives is that it has no 

 avicularia, whereas, although avicularia do not occur to all 

 zocecia, they are fairly abundant, with either one or two 

 narrow avicularia, without a cross-bar, to each zooecium. 



Gregory * reviews very fairly the opinions expressed by 

 various workers and naturally lays great stress on the ovi- 

 Cflls being gonoecia, and my restricted Adeoneila falls into 

 his Adeonellidse; but he unfortunately makes a new genus 

 Schismoporella for Reuss's Lepralia schizogaster, though 

 Reuss's lastt figure shows that what Gregory calls a 

 '* trypa " is really a narrow avicularium, so that the species 

 is an ordinary Schizoporella. 



Levinsen :j: in his large work accepts my restricted Adeo- 

 neila; his Adeona has one or two simple ''ascopores " §, and 

 includes the reticulate Adeona, namely what has been 

 understood as Adeona, together with " Adeona violacea,^^ 

 Johnst., as a synonym of Adeoneila insidiosa, Jull. ; but this 

 point 1 am not prepared to accept at present, for llincks's 

 A. violacea and his var, a. = insidiosa, Jullien, seem distinct 

 species, even if they fall into the same genus. Levinsen puts 

 Bracebridgia, MacG., under Adeonidte. Adeonellopsis, ac- 

 cording to Levinsen, has one or several ascopores, whereas I 

 should say it has the proximal edge of the operculum straight 

 or nearly so, and has usually a perforate area (or sometimes 

 only a pore) in one or both forms of zocecia, with the pores 

 usually stellate. 



We have on the outskirts of both the Adeoneila and 

 Adeonellopsis ditficulties, for in Adeoneila there is A. hiniunita i|, 

 Hincks, which is deeply pigmented, has the long pore-tubes, 

 long triangular avicularia without a bar, also vicarious 

 avicularia of the Adeonidaj ty{)e, and goncecia rather larger 



• " Brit. Palseogeue Bryozoa,"' Traus. Zool. Soc. Lend. vol. xiii. pt. vi. 

 p. 241 (1893J. 



t " Fossileu Biyozoen des ffist.-Ung. MiocJinsi," Denk. math.-naturwiss. 

 d. k. Akad. der AVisseusch. vol. xxxiii. p. 101, pi. iii. lig. 10 (1874). 



X 'Morpbological and Systematic Studies ou the Cheilostomatous 

 Bryozoa,' p. 282 (1909). 



§ Gregory has called a pore perforating the front wall a trypa, and 

 Jullien and Calvet have called the pore of Adeona kc. the spiramen. so 

 that ascopore scarcely seems required. 



II This is the Adeoneila crassa, Busk, MSS. 



