16 



FAMILY NUMMULINID^E. 

 Genus — N'onionina, cVOrhigny. 



175. *i\\ umhilicatula, Montagu. Lower Bed, rather scarce. 



176. N. depressulay W. k J. Rare in both Lower and Upper 

 Beds. 



177. *iV. stelHgera^ d'Orb. Lower Bed, rather scarce. 



Genus — Polystomella, Lamarck. 



178. P. macella, F. tfe M. A very common form in the Lower 

 Bed material, including some fine examples. It seems to take the 

 place of the more widely diffused P. crispa. Upper Bed, rather 

 scarce. 



179. P. craticulata, F. & M. Occurs as a recent form on the 

 Australian Coral Reef. Rare in both Lower and Upper Beds. 



180. *P. verricidata, Br. Only known in the recent state from 

 two localities off East Moncoeur Island (Bass Straits) and Curtis^ 

 Straits, Queensland. Lower Bed, rare. 



181. -^P. imperatrix, Br. The examples, although fine and 

 striking, are not, as a rule, very characteristic. One example was 

 noticed with well-developed spines. The test is invariably sub- 

 angular, but rarely spinous. It is probably a varietal or inter- 

 mediate form which cannot be more accurately classed. Upper 

 Bed, common. 



Genus — Ampiiistegixa, (.VOrhiyny. 



182. A. Lessonii, d'Orb. Mostly of the compressed variety- 

 Lower Bed, moderately common. Upper Bed, rather scarce. 



Genus — Operculina, cVOrhigny. 



183. *0. compJa7iata, Def. Specimens large and very common 

 in Lower Bed. 



184. *0. compJanata, var. (jranulosa, Leymerie. Examples witli 

 more or less of surface ornamentation are also common. Lower 

 Bed. 



Genus — Nummulites, Lamarck. 



185. ]\\ variolaria, Sowerby. This is the most common and 

 striking of the foraminiferal forms in the Muddy Creek Lower 

 Bed. Its occurrence in company with several other large and 

 striking species gives the Lower Tertiary of Australia a forami- 

 niferal facies very closely resembling beds of a similar age in the 

 Northern Hemisphere. It occurs sparingly, along with examples 

 of Operculina, in the Upper Bed, but it is very probable that 

 both these forms in the Upper Bed have been derived from tlie 

 older formation. 



