PsciKlorcrtiKjiis aliicfj, fourteenth volution. 



Ccrith'udii hiiiicIloKiiiii, aperture. 

 • Ccrrthiinu rcturdatuiii, fourteenth vohition. 



Cerlthium rctardatinii. aperture. 

 A'll. — Untogeny of Cerithiuhe. 



Verithiinu ffl?//.vo»(«, third volution. 



Ccrithiiiin mcnkei, second volution. 



('critJiiiiiii iiicnl-ri, fourth volution. 



VicUioccrtthhtm ixiralleluiii.- second volution. 



MciiiocrriHiiiiiii })in'(illcliuii, third volution. 



Vicinocerlthiuin houei, fourth volution. 



Potauiidopsis tricariiiata, second volution. 



Poiaiinilopsls tricariiiata, third volution. 



J^otuiniihji)Kis trochleare, fractured protoionch. 



Potnniidopsis troclileare, fourth volution. 

 A' I II. — Ontogeny of Cerithiidte (continued). 



Ccritkiiiiii callitioiiia, sixth volution. 



Crritltiinn caJIisoma, eighth volution. 



Ceritliium mciihei, fifth volution. 



ViciiioccritJriiriii paraJlclurii. fifth volution. 



MciiiorcritJiiiiiii jnirailclum. seventli volution. 



MciiioccriUiiKiii hoiici, eighth volution. 



Potaiiiidopsis tricarinata, sixth volution. 



Potamidopsis tricarinata, tenth volution. 



J'otamidopsis trochleare. sixtli volution. 



I'otaiiiidopsi'^ ti-ocJilcarr. twelfth volution. 

 i.K. — Ontogeny of Cerithiidte (continued). 



Verithiinu eallixoma, tenth volution. 



Ccrithimn mcnl-ci, tentli volution. 



Mcinoceritliiiuii parallel iiiii . twelfth volution. 



Vicinoceriih in in parallcliini, aperture. 



TicinoceritJiiiiiii boiiei. twelfth volution. 



]'iciii()cerithiiiiii houei, aperture. 



Potaiiiidopsi-'< tricarinata. twenty-third volution. 



Potamidopsis tricarinata, twenty-fourth volution. 



Potamidopsis trochleare, aperture. 

 X. — Quarry in Basalt at West Paterson. X. .T. 

 XI. — ^lagnified sections of Basalt and Secoudni'v Minerals. 



Xormal crystallization of dense Basalt. 



Dense Basalt bordered by Secondary Al])ite. 



Deui-e Basalt bordered by Secondary Alliitc lAb) with l.-uililve gnmix 

 of Prehnite (Pr) and some Calcite (Ca). 



Groups of radiating quartz crystals snrvivii!g from an early pi-riod of 

 alteration in a slid(> in whirh Zeolit(>s and Chlorite form the principal 

 features. 



Garnet (Gr). tibi-ous green Anii»hibnle (Ami and Prelniite il'r) encrust- 

 ing dense Basalt. 



(Jarnet grains ((Hr). acicular Amiihiitole (Ami and long net liles of 

 Pectolite (Pc) in Prehnite (Pr). 



