194 Messrs. Parker and Jones on 



Fig. 32, Strophoconus ovum, and figs. 33 & 34, St. spicula, 

 arc small coarse-shelled Virrjultnce Schreihersii. Figs. 35 & 36, 

 PyruUna ovulurn^ = Polymorphina UwMa, Fig. 37, Pleurites 

 tanjans, probably Virgulina Hemprichiij but dfjubtful ; it may 

 jjossibly be a Polymorphina. Figs. 38-53 represent different 

 ages, stages, and conditions of Gloh{<jer{na cretacea (fig. 38, 

 liotalia iKirforata ; fig. 39, li. quaterna ; figs. 40, 41, 43, li. glo- 

 bulosa; fig. 42, It. laxa\ fig. 44, It. aspera-^ fig. 45, 49, It. 

 lejdospira ; figs. 46, 47, R. senaria ; fig, 48, It. glonierata | 

 figs. 50, 51, It. wohjensis ; fig. 52, Flanulina incurvata, showing 

 the diagnostic aperture; and fig. 53, PL oceUata). 



i'ig. 54, LeaticuUna i pachydarma^ = Palvinulina caracolla 

 (Koeni.). Fig. 55, Planulina umhilicata (?), represents the 

 central chambers of a Planulina ] compare fig. 60 for instance. 

 Fig. 50, PL j'onphoina, and fig. 57, PL pardalis^ are relatively 

 large specimens of probably Planulina ariminensis. Fig. 58, 

 LenticuUna discuny = Planorhulina Ilaidinfjerii, almost of the 

 typical form. Fig. 59, Planulina microntjjhaluj fig. GO, PL 

 aiapliata^ and fig. 61, PL ampda^ are all probably Planulince 

 belonging to the PL ariminensis type. 



Fig. 62, PL turyida, seems to be a small Operculina. This 

 subgenus of Nummulina is rare in the Cretaceous strata, and 

 therefore the Russian specimen is of great interest. Two 

 Operculimii (one described and figured by Keuss as Amphi- 

 stcyina Fleuriasi^ D'Orb.,and the other as Op. cretacea) occur 

 in the Maestricht Chalk, ' Sitzungsber. Akad. Wien,' vol. xliv. 

 pp. 308, 309, pi. i. figs. 10-12, and pi. ii. fig. 1, a, h. Another, 

 described ana figured by Keuss as Amphistegina clypeolus 

 (Zeitschr. Deutsch. geol. Gesellch. vol. vii. pi. ix. fig. 9), was 

 found, in Ujjper Chalk of the same age as that of Maestricht, 

 at Meckleidjurg. From the Lower Cretaceous foraiation in the 

 llaute-Marne, France, M. Cornuel has a somewhat doubtful 

 02)erculina [Op. angularis)^ Mem. 8oc. G^ol. France, ser. 2, 

 vol. iii. part 1, M6m. no. 3, pi. 2. figs. 20-22. 



Coniostylis and Coccoliths arc also figured on this plate. 



The group of Foraminifcra here represented belonged to a 

 fauna inhabiting a shallower part of tlie sea than that witli the 

 western Chalk, probably from 50 to 100 fathoms in depth. 



Species and notahle Varieties from the Chalk of Volsk, Russia^ 

 figured hy Ehrenberg. 



1. Orbulina uni versa, D^Orb. 



2. Lagena emaciata, Rss. 



3. stiligera [Ehr.). 



4. Nodosaria ovicula, D^ Orb. 



