the Nomenclature of the Foraminifera. 197 



Coccoliths are also given on this plate in fig. I. B. 

 This Chalk was probably formed in about 50 to 100 

 fathoms. 



Sjyecies and noticeable Varieties from the Chalk of the Tipper 

 Missouri^ figured by Ehrenberg. 



1. Nodosaria glabra, D'' Orb. 

 2. acus, Ehr. 



3. Cristellaria ? 



4. Virgulina Schreibersii, Czjzeh. 



5. Textilaria gibbosa, D'' Orb. 



6. missouriensis, Ehr. 



7. striata, Ehr. 



8. {et Spiroplecta) americana, Ehr. 



9, striato-punctata, Egger. 



10. Globigerina hirsuta, D'' Orb. 



11. Planorbulina globulosa {Ehr.). 



XVIII. Foraminifera from the Chalk of the Upper Missis- 

 sippi^ North America. (Monatsb. 1842, p. 187 ; Abhandl. 

 1841,pp. 365, 433 [1843].) 



In the ' Americ. Journ. So.' vol. xli. p. 400, the material 

 examined by Dr. Ehrenberg is described as " a light cream- 

 coloured marl from a Mission-station on the Upper Mississippi, 

 called there ' prairie chalk,'" and some unnamed woodcut out- 

 lines of the Foraminifera are given (p. 401), namely : — figs. 1 

 &, 2, Textilaria gibbosa] fig. 3, Cristellaria cultrata^ with 

 narrow falcate chambers ; fig. 4, a small Planorbulina. 



PI. XXXII. II. fig. 1, Miliola striata^ =Lage7ia costata^ Wil- 

 liamson. Fig. 2 a, M. kevis, =L. emaciata^ Reuss. Fig. 2 5, 

 Ovidina clava, =L.clavata, D'Orb. Fig. 3, Dentalina ameri- 

 cana^ = D. Boueana, D'Orb. Fig. 4, Nodosaria tumescensy 

 = N. ovicula, D'Orb. Figs. 5, N. vulgaris, and 6, N. ampla, 

 = N. glabra, D'Orb. Fig. 7, Vaginulina calcipara, fig. 8, 

 V. cretce, and fig. 9, V. sid)acuta, = V. leguminiformis (Batsch). 

 Fig. 10, Plamdaria elongata, is a simple subcarinate Planula- 

 ria, or an elongate Marginuline Cristellaria cultrata, and is 

 known as PI. crej^idula (F. &M.). 



Fig. 11, Textilaria striata, is a thick-shelled T. striata. 

 Fig. 12, Text, globulosa, is the common small form of T. gib- 

 bosa, and so is fig. 13. Fig. 14, T. striata, is a rather narrow 

 T. striata. Fig. 15, Grammostovium americanum, is Bolivina 

 dilatata, with a faintly reticulated surface. Fig. 16, Gr. 

 phyllodes, = Virgulina squamosa. Fig. 17, Gram, invalidum, 

 is a small Textilaria of the agglutinans type. Fig. 18, Gr. 



