Dr. II. Woodicard — A Neir C impede from the Chalh. 101 



The imbricated scales or plates, which extend below the base of 

 the rostrum and carina, spread outwards at a considerably wider 

 angle than the capitulura. The attached valve of some small mollusc 

 is seen adhering to the imbricated scales below the rostrum. 



From the disparity in the proportions of the rostrum and carina, 

 and the absence of alas, we arrive at the conclusion that the terga 

 and scuta were not mere opercular valves, but formed a part of the 

 capitulum ; that latera were also present is proved by the increase 

 in size of the sub-lateral scales, which are much larger than those of 

 the rostral or carinal series (see PI. VIII, Figs. 4a, h). 



There can, I think, be no reasonable doubt that Brachjlepas forms 

 a distinct family, from which at a later period probably the modern 

 Operculata have arisen. 



The place of Brachjlepas in the phylogeny of the subclass may be 

 indicated as follows : — 



CIURIPEDIA. 



Pedunculata 

 i^Lepadidce) 



Lepas Scalpeihon rulUcipes 



Ol'EltCULATA 



{Balanida; etc., etc.). 

 Catophraymiis Balanus, etc., etc. 



SealpcUitiii (Gault) 



Bkachylepas (Chalk) 



PoUicipes (Rb;i.'tic) 



Tiirr'ibpds (Sihiiiiin) 



EXPLANATION OF PLATE VIII, Eigs. 1-). 

 Fig. l.-BaJanusncmen,K... Recent : British (^d nat.) -}. (See also Darw^^^^^^ 



" Balanidtc " p. 277, pl. vii, fij?- 5. r. rostrum ; c. car ma ; r.l. rostro- lateral 



compart^ut;^. lateral con^artmeat ; I.e. earino - h.teral compartment. 



i. basis ; Oi'. opercular valves. /tj„,*\j /. ,..,rin'i • 



YiG.^2a.-Follic\pesmitcUa,Unn. Recent: East Indies (Ad nat.) .. '' • ™ ; 



/ ter-ura s scutum ; r. rostrum ; /. latus ; s.r. sub-rostrum ; s.c. .ub-cauna . 



belween ;.>•.■ and L'- the valves ot the lower latera are seen ; p.. pednneular 



Fig 2r-F;ur of the lower latera, with some of the peduncular scales onlar.q:ed. 



fU'OT Map Dec I Vol. V, 1868, p. 'iJ^S, PI. XI\ , tigs. 1,2). t r >m tlie 

 Chalk '1 Norwich/' Preserved in' the British Museum (Natural History). 

 Enlarsred twice natural size. 



Fig. 



