General Tlistory of the Mirine Polyzoa. 175 



The portion of this panigraph fioin p. 42, line 8 from the 

 bottom, " I m(!iition this" &c., to p. 43, line 4 from the top 

 (inclusive), may be cancelled. 



Ibid. (p. 44 Sep.). 



DiACHORiS, Busk. 



The species of Diachon's must be ranged under the genus 

 Beania, Johnston. There are no generic differences between 

 the two forms. In both the zooecial characters are Bicel- 

 larian ; Diac/ioris, which is usually furnished with articu- 

 lated avicularia, making a nearer approaclv than Beania to 

 Ihu/ula, from which indeed it is chieHy distinguished by the 

 more complex character of its zoariuin *. ]\IaeGillivray lias 

 already united the two genera under the earlier name Beania'f. 



'Annals,' July 1881 (p. 49 sep.). 

 Membranipora radicifera, sp. n. 



This was the first species of Membranipora in which 

 attachment by means of tubular fibres had been observed. 

 Since its discovery the same structural peculiarity has 

 occurred in several forms, and may prove to be far from 

 uncommon. A more systematic study of the radical appen- 

 dages is a desideratum, and would form a very interesting 

 chapter in the history of the Polyzoa. 



MacGillivray has placed this species in the genus Beania^ 

 a decision which I am quite unable to accept (see " Critical 

 Notes," ' Annals,' ser. 5, vol. xix. p. 158). 



Ibid. (p. 55 Sep.). 

 Steganoporella magnilahris, Busk. 



In the last line of this paragraph for "Lepralia " read 

 Membranipora. 



Ibid. (p. 65 Sep.). 



Cribrilina ferox, MacGillivray. 



This species lias certainly no right to a place in the genus 

 Cribrilina, from which it is separated by the remarkable 



* Brit. Mar. Polyzoa, vol. i. pp. 65, 66. 

 t Prodr. Zool. Victoria, dec, xii. p. 67. 



