IREDALE & o'dONOGHUE : BRITISH NUDIBRANCHIATE MOLLUSCA. 203 



Cratena northumbrica, A. & H., Conch. Soc. List, p. 18. 

 Cuthona ? northumbrica, A. & H. ; Eliot, p. 131, pi. vi, figs. 4, 5, 

 p. 173. 



Genus Cuthona, Alder & Hancock, 1855. 

 Cuthona, A. & H., Mon. Nudib. Moll. (Ray Soc), pt. 7, App. p. xxii, 

 1855. 

 Type by monotypy, Eolis nana, A. & H. 



CUTHONA NANA (Alder & Hancock, 1842). 

 E{olis) nana, A. & H., Ann. & Mag. Nat. Hist., vol. ix, p. 36, March, 

 1842: Cullercoats. 



Mon., Fam. 3, pi. xxv, pt. 4, 1848. 



Cuthona nana, A. & H., Conch. Soc. List, p. 18 ; Eliot, p. 173. 



CUTHONA PEACHii (Alder & Hancock, 1848). 

 Eolis peachii, A. & H., Ann. & Mag. Nat. Hist., ser. ii, vol. i, p. 191, 



March 1, 1848 (ex Athenaeum, No. 1028, p. 748, July 10, 



1847, n.n.) : Fowey Harbour. 



Mon., Fam. 3, pi. x, pt. 6, 1854. 



Cratena peachii, A. & H., Conch. Soc. List, p. 18. 

 Cuthona peachii, A. & H. ; Eliot, p. 173. 



CUTHONA CONCINNA (Alder & Hancock, 1843). 

 Eolis concinna, A. & H., Ann. & Mag. Nat. Hist., vol. xii, p. 234, 

 Oct. 1843 : Whitley, Northumberland. 



Mon., Fam. 3, pi. xxiv, pt. 1, 1845. 



Cratena concinna, A. & H., Conch. Soc. List, p. 18. 

 Cuthona concinna, A. & H. ; Eliot, p. 173. 



CUTHONA AMCENA (Alder & Hancock, 1845). 

 Eolis amcena, A. & H., Ann. & Mag. Nat. Hist., vol. xvi, p. 316, 

 Nov. 1845: Torbay. 



Mon., Fam. 3, pi. xxx, pt. 2, 1846. 



Cratena amcena, A. & H., Conch. Soc. List, p. 18. 

 Cuthona amoena, A. & H. ; Eliot, p. 173. 



CUTHONA PUSTULATA (Alder & Hancock, 1854). 

 Eolis pustulata, A. & H., Ann. & Mag. Nat. Hist., ser. ii, vol. xiv, 

 p. 104, Aug. 1, 1854 : Cullercoats. 



Mon., Fam. 3, pi. xlv, Suppl., pt. 7, 1855. 



Cratena pustulata, A. & H., Conch. Soc. List, p. 18. 

 Cuthona pustulata, A. & H. ; Eliot, p. 173. 



CUTHONA coucHii (Cocks, 1852). 

 Eolis couchii, Cocks. Naturalist (Morris), vol. ii, pt. 1, pi. i, fig. 2, 

 1852 : Falmouth. 



A. & H. ; Mon., pt. 7, App. p. x, 1855. 



Cratena couchii, Cocks, Conch. Soc. List, p. 18. 



