IREDALE & o'dONOGHUE : BRITISH NUDIBRANCHIATE MOLLUSCA. 197 



Idalina is altered to OJcenia. 



Lamellidoris „ Onchidorus. 



Platydoris ,, Argus. 



Pleurophyllidia „ Armina. 



Proctonotus ,, Zephyrina. 



Staurodoris - ,, Doridigitata. 



Triopa ,, Euphurus. 



Tritonia ,, Sphcerostoma. 



The new names introduced in this essay are : — 

 Diaphoreolis, gen. nov. Type, Eolis northumhrica, Alder & Hancock. 

 Favorinus alhidus, nom. nov., for Eolis alba, Alder & Hancock. 

 Embletonia pygmcea, nom. nov., for Eolida minima, Forbes & 



Goodsir. 

 Atalodoris, gen. nov. Type, Doris pusilla. Alder & Hancock. 

 Diaphorodoris, gen. nov. Type, Doris luteocincta, M. Sars. 

 Issena, gen. nov., for Issa, Bergh. 



Rostanga rufescens, nom. nov., for Doris coccinea, Alder & Hancock. 

 Doridigitata sticta, nom. nov., for Doris maculata, Garstang. 

 Candellista, gen. nov. Type, Tritonia alba, Alder & Hancock. 



NUDIBRANCHIA. 



ASCOGLOSSA. 

 Family LIMAPONTIIDiE. 

 Genus Acteonia, Quatrefages, 1844. 

 Acteonia, Quatrefages, Ann. Sci. Nat. (Paris), ser. iii, vol. i, p. 142, 

 March (published ante April 15), 1844. 

 Type by monotypy, A. senestra, nov. 

 Ictis, Alder & Hancock, Athenaeum, No. 1028, p. 748, July 10, 

 1847. 



Type by monotypy, I. cocksii, nov. 

 Cenia, A. & H., Ann. & Mag. Nat. Hist., ser. ii, vol. i, p. 404, 

 June 1, 1848. 



New name for Ictis, A. & H., not Ictis, Kaup, Skizz. Entwick.- 

 Gesch. Nat. Syst., p. 40, 1829. 

 Lafontia, Locard, Prodr. Malac. Franc. Moll. Marins, p. 532, 1886. 

 New name for Acteonia, Quatrefages, 1844, for the sake of 

 purism. 



AQTEONIA COCKSII (Alder & Hancock, 1847). 

 Ictis cocksii, A. & H., Athenaeum, No. 1028, p. 748, July 10, 1847 : 



near Falmouth. 

 Acteonia corrugata, A. & H., Ann. & Mag. Nat. Hist., ser ii, vol. i, 



p. 403, pi. xix, figs. 2 and 3, June 1, 1848 (ex Athenaeum, 



No. 1028, p. 748, July 10, 1847, n.n.) : Falmouth. 

 Acteonia corrugata, A. & H., Conch. Soc. List, p. 17 ; Eliot, 



pp. 142, 179. 



