TIIH SKSS1LE BARNAC1 !>. 271 



d*. Form cylindric (hexagonal), the orifice and basis of 

 eqnal size; basal edges of compartments having small 



toclli, (ho median one largest Ci/lin<lrol<'i><iK, p. 287. 



c 2 . Orifice much larger than the basis; basal edges of compartments 

 simple. 



<?'. f 1 up-shaped, subspherical or shortly eylindric, the 

 parietes with annular ridges interrupted in the middle 

 of each compartment by a smooth longitudinal area; 

 inner edges of the compartments not forming a lobed 

 rim around the orifice Stephanolepas? 



d 2 . Bowl-shaped, with a cellular outer layer ; inner layer 

 of each compartment forming a thin, rounded lobe at 

 the orifice Rtomatolepaa, p. 288. 



CORONULID SERIES. Borders of the mantle produced around the 

 oral opening to form a hood over the cirri ; plates of the wall with- 

 out a median longitudinal sulcus or impression. Living on Cetacea. 



Genus CORONULA Lamarck. 



1802. Coronula LAMARCK, Annales du Museum Nationale, vol. 1, p. 464, 



for Baluiuts diadema, lialfiitns bahruaris, and Bahniux tcsfmlinarius. 

 1817. Diarli "inn SCHUMACHER, Essai d'un nouveau Systeme Vers Testatvs, 



p. 90; monotype, J). riiltinrift = - LI'JHIS diadema Linnaeus. 

 1817. Diadema, RANZANI, Opuscoli Scientific!, vol. 1, fasc. 4, p. 276. No 



species mentioned. 2 

 1817. Cctopirns RANZANI, Opuscoli Scientific!, vol. 1, fasc. 4, p. 276. No 



species mentioned. 2 

 1825. Poli/Icpas Klein, GRAY, Annals of Philosophy, new ser., vol. 10, p. 105 



(P. diadema here selected as type). 

 1833. CoronuJitcs PARKINSON, Organic Remains of a Former World, vol. 3, 



p. 240; monotype, C. diadema Parkinson (=C. Barbara Darwin?). 

 1852. Polylopas Klein, MORCH, Catalogus Conchyliorum qua 1 reliquit D. A. 



d'Aguirra et Gadea, Comes de Yoldi, p. 66; monotype, /'. diadema. 

 1852. Cctcoittnis Ranzani, MORCH, Catalogus Conchyliorum quse reliquit 



D. A. d'Aguirra et Gadea, Comes de Yoldi, p. 67 ; monotype, C. com- 



pJtnuitus Chemnitz. 



1854. Coroiuila DARWIN, Monograph, p. 397. 

 1895. Flabelcorona DE GREGORIO, Annales de Geologie et de Paleontologie, 



17 livraison, p. 5; monotype, Coronula (Flabelcoronn) /ic<tr<r;:.'cnsis 



De Gregorio. 



Barnacles with six equal compartments around the small body- 

 chamber, the parietes bearing- four radiating lamellar folds, simple 

 or branching, and terminating in T-shaped flanges, which, being in 

 close contact, form an outer wall and inclose cavities open below, occu- 

 pied by the skin of the host. Radii wide. Basis membranous. Oper- 



1 Stepfianolepas will not be considered further in this work, since the single species is 

 not contained in the collection of the National Museum. For description see H. Fischer. 

 Actes de la Societe Linueenue de Bordeaux, vol. 40, 1880, p. 193. Further notes and figures 

 _ are given by A. Gruvel, Nonvelles Archives du Museum, ser. 4, vol. 5, 1903, p. 149. Type 

 and sole species 8. muricata Fischer, Pulo Condor, Cochin China, in the interstices of the 

 dermal plates of ThalasKocJielys im'brlcatn. 



- In his paper of 1S18 Ranzani supplied types to the genera proposed in the previous 

 year. He described Cetopirus balrcnarls (=Coroni<1a coinplanata) , and Diadema can>H<Jiti:i 

 (=Coronula diadema). No other species of these genera were mentioned. 



