THE SESSILE BARNACLES. 273 



h''. CoTivexly conic, depressed, the parietal ribs flat, beautifully beaded ; ribs 



in the base having few, nut synnnetrical branches C rcyinw, p. 275. 



a'. Body-chamber very shortly barrel-shaped or cylindric, the basal opening at 

 least as large as the orifice ; sheath decidedly shorter than the inner wall, 

 its basal edge not overhanging ; ribs along the sutures, in the base, having 

 several symmetrically arranged branches in adult individuals; radii almost 

 as thick as the compartments ; opposed edges of the terminal flanges of the 

 ribs roughened but not crenulate ; form depressed. Subgenus Cctopirus. 



C. com plana ta, p. 270. 

 Pliocene species of Coronula. 



Coronula harl>ara Diirwiii (Monograph, p. 421), of the British Txed 

 Crag, is rehited to C. diadema^ but the spaces beloAV the radii are 

 solidly filled up. 



Coronula hlfda'^ has not been very clearly distinguished from 

 C. hcD'hai'd.- Dladema diluoiana O. G. Costa " a[)pears from the 

 figures to be either C. hlflda or C. harhara. 



Coroiada fcarazzcnsls Do Gregorio, referred to above under the 

 perfectly useless subgenus Flahcl corona^ is a form very close to 

 C. reghiw D:ir"\vin; whether identical or not requires a comparison 

 of specimens to tell. 



CORONULA DIADEMA (Linnseus). 

 Plate 65, figs. 3, 4. 



1767. Lepas dladema Linnaeus, Systema Naturjp, ed. 12, p. 1109 (see 



Hanley, The Shells of Linufeus, p. 20). 

 1776. Lepas balcenaris O. F. Muller, Zoologise Dauica rrodromus, p. 2r)0, 



No. 3024. 

 1778. Bdlanus bakrna Da Costa, Hist. Nat. Test. Brit., p. 251. 

 1780. Lepas hala^naris O. Fabricius, Fauna Grtienlandica, p. 425. 

 1790. Lepas halcEnaris Gmelin, Systema Naturj^e, ed. 1.3, p. 3208. 



1817. Dladema vulgaris Schumacher, Essai d'lm nouveau Syst. Vers 

 Testaces, p. 91. 



1818. Dladema candldum Ranzani, Opuscoli Scientifici, vol. 2, p. 88. 

 1818. Coronula dladema Linnaeus, Lamarck, Hist. Nat. Aniiu. sans Vert., 



vol. 5, p. 887. 

 1825. Polylcpas {Dladema) hieinil Gray, Annals of Philosophy, new ser., 



vol. 10, p. 105. 

 . Coronula dladema Lamarck, Chknu, Illustration Conchyliologiques, 



pi. 1, fig. 3 ; pi. 2, fig. 3 ; pi. 3, fig. 5. 

 1854. Coronula dladema, Linnaeus, Darwin, Monograph, p. 417, pi. 15, figs. 



3, 3ff, b; pi. 16, figs. 1, 2, 7. 

 1870. Coronula biscayensis Van Beneden, Bull, de I'Acad. Roy. des Sci. 



des Lettres, et des Beaux-Arts de Belgique, ser. 2, vol. 29, p. 319. No 



description. 

 1870. ? Dladema japonica Van Beneden, Bull, de I'Acad. Roy. des Sci. 



des Lettres, et des Beaux-Arts de Belgique, ser. 2, vol. 29, p. 354. 



Named, but not described, from a .Japanese drawing. 



iBronn, Italiens Tertlar-Gebildc, 1831, p. 126. 

 2 de Alessandri, Palfpontojiraphica llalica, vol. VI, 1906, p. 315. 



* Di alcuni Balanidi app. al Regno di Napoli, In Atti Accad, Sci. NapoU, vol. 5, pt. 2, 

 1843, p. 120, pi. 1, flg. 7. 



