784 CLASS XIII. 
Sp. Triopa claviger, Doris clavigera MUELL., Zool. Dan. Tab. 17, figs. 1—3 ; 
comp. JoHnsTon Ann. of Nat. Hist. 1. pp. 124, 125, ALDER ibid. xv. 
pp. 262—264. 
Plocamopherus Lnuck. (Plocamoceros Cuv. from typogr. error). 
Ancula Lovin. 
Idalia LewcK., Euplocamus PHIL. 
Comp. Lruckart Breves Animal. quorund. Descript. p. 15, Tab. 1. fig. 2, 
PHILIPPI, WIEGMANN’S Archiv, 1839, 8s. 113—115, Taf. u1., Annals of Nat. 
Hist. Iv. 1840, pp. 88—go, Pl. 111. figs. 1, 2. 
Doris li, 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 branchiz 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 lamellee. 
Doris ; see the critique of CUVIER on this name and on the confusion of 
this genus by GMELIN and others in Ann. du Mus. Iv. p. 447 and foll., 
Mollusqg., Mém. No. 5. 
Compare Rapp Ueber das Molluskengeschlecht Doris, Nov. Act. Acad. 
Ces. Leop. Carol. XII. pp. 513—522, Tab. 26, 27, and G. JOHNSTON 
Scottish Mollusca nudibranchiata in Annals of Nat. Hist. 1. 1838, pp. 50— 
55, HANcock and EMBLETON on the Anatomy of Doris, Phil. Trans. 1852, 
pp. 207—252. 
Sp. Doris Argo L., Bonapscw de quibusd. Animal. mar. Tab. Vv. figs. 4, 5, 
DELLE CuHIAJE Mem. Tav. 38, figs. 1—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., Jounst., ALD. and Hanp. Monogr. 
Fam. 1. Pl. 3; Doris stellata Gunt., BomME Verh. van het Zeewwsch Ge- 
nootsch. Il. 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 Buatnv., Goniodoris ForBEs. 
Section IJ. Organs of respiration branchiz, included in mantle, 
or covered by free margin of mantle. 
Family V. Hypobranchiata. Naked gasteropods, hermaphro- 
dite, marine. Branchial lamelle situated on each side in a furrow 
between the mantle and foot, transverse, in a single row. 
