1, 1ST OF ILUSTltA'l'lOXS. 



I'Ullrs. 



1. — SuJ'fnce t'eaturt'S of Ceritliiuiii ;ni(l N'lil'u'nccril liinin. 

 II. — Mciitocciitliitnii hoiici { Desliayes ) . 



yiciitoccritliiinii jxiralleliiiii sp. iiov. 



Ceritliiuiii iKlanxnui I>rnguiere. a yoium iiuliviiUial. 



CerithUiiii tiihci-osiiin ColnniiiiV. 



Ceritliiiiiii injiiiviiiidh' sp. iiov. 



C'eritliiiini jrtanldfiiiii sp. iiov. 



Ccritliiinii hicdriiiKtiiiii Jiuit. I ii.-<t)ir(ilis mut. nov. 



Vcrithhini hicarinat inn I_)esha.ves. 

 III. — Ontogeny of 8i.\ species of Cerithiuni. 



('(litliiiiin tiihciosiiDi. fourth volution. 



Ccrithiinii adaiisoni. protoconcli. 



Ccr'tiliiiiin lulan^^onl, second volntiim. 



Ccrithiinii (idansoiii. third volution. 



Coithimii? 110(1 iilo.siiiii. fourth volution. 



Pscinl'irrrtfu/iis (iJiico. fourth volution. 



Ccrithinin hniicUdxiiiii. protoconch and fii'st volution. 



Ccritliiiiiii laiiicllosinii. thii'd volution. 



Cerithiinii rciardiit inn. second volution. 



Ccrilhiiiiii rctanliitinii. third volution. 

 IV. — Ontogeny of six species of Cerithiuni (continued). 



Cerithiuni tiitjcroxiiin. eighth volution. 



Ccritlii 1(111 (1(1 a II sou i. hfth volution. 



Ccrithiinii (tdaiisoiii. eighth volution. 



Ccritlii mil ? 11(1(1 iitoxinii. sixth \'olution. 



Ccritliiinii? nod iitosniK. eight!) \'olution. 



PsciKlovciidfiiis (itiico. seventii volutimi. 



Psciidorcrtdf/iix dtiiro. eighth volution. 



Ccrithiinii tdincttusinn. fifth volution. 



Ccritliiinii rctardatinn, fifth volution. 



Cerithiuni retardatum, seventh volution. 

 \. — Ontogeny of six s])ecies of ("erithium ( ContinuiMl ). 



Ccritliiinii ddansoni. ninth volution. 



Ceritliiinii addiisoni. aperturi-. 



CeritJiiinn irfjiiispii-dlc. ninth volution. 



Ccrithiinii (r(iuisi)irdlc. twelftli volution. 



Pseiidorcrtdi/iis dliico. tenth volution. 



Pseiidon lid/Ills dtiico. eleventh voluti.)n. 



Ceritliiinii Iiiiik llosmn. ninth volution. 



Cerilhiinn Iiiiik llnsmn. eleventh volution. 



Ccrithiinii rchirddfinn. ninth volution. 

 VI. — Ontogeny of si.\ species of ("erithiuin (continued). 



Ccrithiinii I iilicrosinn . thirtee))tl) volution. 



Cerilhiinn I iihcrosiini. I'oui'teeidli \"olutio)i. 



Ccrithiinii d (iiiisjiiiiilf. foui'tccid h vulnticn. 



Psciidoniidffiis dliico. thii'tet'nlh xolutioii. 



iv 



