784 CLASS xin. 



Sp. Triopa claviger, Doris clavigera MUELL., Zool. Dan. Tab. 1 7, figs, i 3 ; 

 comp. JOHNSTON Ann. of Nat. Hist. i. pp. 124, 125, ALDER ibid. xv. 

 pp. 262 264. 



Plocainopherus LEUCK. (Plocamoceros Cuv. from typogr. error). 



Ancula LOVE*N. 



Idalia LEUCK., Euplocamus PHIL. 



Comp. LEUCKAKT Breves Animal, quorund. Descript. p. 15, Tab. i. fig. 2, 

 PHILIPPI, WiEGMANN's^lrcAtv, 1839, s - IJ 3 11 5> Taf. in., Annals of Nat. 

 Hist. iv. 1840, pp. 88 90, PI. in. figs, i, 2. 



Doris L., Cuv. Body flat or gibbous above, with abdomen flat, 

 covered by a loose membrane, and plicato-marginate. Vent pos- 

 terior dorsal, in the mid line of body, surrounded by branched or 

 plumed branchiae disposed in a circle. Apertures of generation at 

 the right side. Tentacles four, two inferior (vestiges of veil) at 

 the proboscidious mouth, two superior retractile within tubes, annu- 

 late with transverse lamellae. 



Doris ; see the critique of CUVIER on this name and on the confusion of 

 this genus by GMELIN and others in Ann. du M us. iv. p. 447 and foil., 

 Mottusq., Mem. No. 5. 



Compare RAPP Ueber das MollusTcengeschlecht Doris, Nov. Act. Acad. 

 Cces. Leop. Carol, xni. pp. 513522, Tab. 26, 27, and G. JOHNSTON 

 Scottish Mollusca nudibranchiata in Annals of Nat. Hist. i. 1838, pp. 50 

 55, HANCOCK and EMBLETON on the Anatomy of Doris, Phil. Trans. 1852, 

 pp. 207 252. 



Sp. Doris Argo L., BOHADSCH de quibusd. Animal, mar. Tab. v. figs. 4, 5, 

 DELLE CHIAJE Mem. Tav. 38, figs, i 7, flat, deep-red above, 3" long. 

 2" broad ; in the Mediter. ; a flat species of similar size occurs in the 

 North Sea : Doris tuberculata Cuv., JOHNST., ALD. and HAND. Monogr. 

 Fam. i. PI. 3 ; Doris stellata GMEL., BOMME Verh. van het Zeeuwsch Ge- 

 nootsch. ill. p. 318, fig. 4 (does it differ from Doris tomentosa Cuv., D. 

 pilosa JOHNST. ?) 



Note. Add some genera of modern writers, Villiersia D'ORBIGNY, 

 Onchidora BLAINV., Goniodoris FORBES. 



Section II. Organs of respiration branchiae, included in mantle, 

 or covered by free margin of mantle. 



Family V. Hypobranchiata. Naked gasteropods, hermaphro- 

 dite, marine. Branchial lamellae situated on each side in a furrow 

 between the mantle and foot, transverse, in a single row. 



