the Nomenclature of the Foraminijera. 199 



fig. 32, R. hptospiray are smooth, polished and apparently 

 poreless, and, with their numerous globose limbate chambers, 

 are readily identified as PulvinuUna canarienst's (D'Orb.), 'Hist. 

 Nat. Canaries, Foram.,' pi. 1. figs. 34-36. Fig. 33, Botah'a 

 calcipara, and fig. 34, OmpJialophacus'? fenelhis, belong to a 

 somewhat prickly variety of Fah'inuh'na Menardii\ D'Orb. 

 Fig. 35, PlanuUna nebulosa, is obscure ; perhaps a Planorhu- 

 lina. 



Fig. 36, Rotalia nonas ('?), may be an umbonate and limbated 

 Cristellaria rotidata (?). Fig. 37, Cristellaria aJta, is a young 

 Cristellaria cidtrata. Fig. 38, Aspidospira saxipara, is PJa- 

 nidina ariminensis with large scattered foramina. Fig. 39, 

 Bohidina? denaria, seems to be an umbonate CristeUaria ro- 

 tidata. Fig. 40, Rotalia heptas, is probably the same as fig. 36. 

 Figs. 41, Planidina mississippica, 42, Phanerostomum asperumy 

 43, Planidina oligostict<i^ 44, Phan. glohulosum (young), 45, 

 Rotalia glohulosa-protolepta (young and smooth), and 46, Phan. 

 quaternarium (young and smooth), are subvarieties and con- 

 ditions of a large, outspread, tuberculated Glohigerina of the 

 cretacea subt}-pe ; and not nearly so acerose, nor with such 

 patulous apertures, as the fossil Glohigerina from the Upper 

 Missouri, figured in the upper part of this plate. Fig. 47, Ro- 

 hidina ocellus, is a young Cristellaria cidtrata. Fig. 48, Pla- 

 nidina suboctonaria, is Planorhidina ammonoides. 



Coccoliths also are indicated in the text. 



The group indicates about 50 to 100 fathoms depth. 



Species and noticeable Varieties from the Chalk of the Upper 

 Mississippi, fgured by Ehrcnberg. 



1. Lagena costata, Williamson. 



2. emaciata, i?.^^'. 



3. clavata, X>' Orb. 



4. Glandulina lievigata, i)' Orb. 



5. Dentalina Boueana, i)' Orb. 



6. Nodosaria ovicula, D^ Orb. 



7. glabra, D' Orb. 



8. Vaginulina leguminiformis {Batsch). 



9. Planularia crepidula {F. cO M.). 



10. Cristellaria rotulata (Lamk.). 



11. cultrata {Montf). 



12. Polymorphina compressa, D^ Orb. 



13. Bolivina dilatata, Rss. 



14. americana, Ehr. 



15. Virgulina squamosa, D^ Orb. 



16. Schreibersii, Cz., var. 



