220 



Messrs. Parker and Jones on 



= Orh. adunccij and var. orhiculus (F. 



From the Red Sea and 

 of Orhitolites orbiculus 



From the Red Sea? 



From the Antilles 

 & M.). 



hg. 2, «, b, c. d. Sorites orbiculus 

 Mediterranean. Young stage 

 (Forskal). 

 fig. 3. Amphisorus Hemprichii. 

 Old condition of the same. 

 PI. 4. fig. 1. " Writing Chalk," from Puszkary, Poland ; op- 

 posite Grodno, on the Memel. 



fig. 2. The same, from Jutland, Denmark. 



fig. 3. The same, from Rligen Island, Pomerania. 



fig:. 4. The same, from Gravesend, on the Thames. 



5. The same, from Meudon, near Paris. 



6. " Harder writing Chalk," from Cattolica, Sicily. 



7. " Compact Chalk," from Cahira, Mokattam Hills, 

 near Cairo. 



fig. 8. The same, from the catacombs of Thebes, Upper 



Egypt, 

 fig. 9. " Compact grey limestone," from Hamam Faraun 



(Mountain), Sinai, Arabia, 

 fig. 10. " Chalk-marl," from Oran, Africa, 

 fig. 11. The same, from Caltanisetta, Sicily, 

 fig. 12. The same, from Greece. 

 These are samples of the limestones or marly earths*, finely 

 levigated, showing the Microzoa &c. of which they are seve- 

 rally composed, highly magnified, and few exceeding -^V of ^ 

 (Paris) line in diameter. 



The following list comprises the Foraminifera figured in 

 plate 4, as named in the memoir : — 



fii 



u 



Globigerina buUoides (?), D'Orh. 



helicina (?), D'Orb. 



Planulina sicula. 



turgidaf. 



Robulina cretacea. 

 Rosalina foveolatat. 



globularis (?), D'Orb. 



• Ifevigataf. 



pertusa. 



Rotalia globulosaf. 



ocellata. 



ornata. 



Rotalia perforata. 



scaora. 



stigma. 



Textularia aciculata (?), Z)' Orb. 



asperaf. 



brevis. 



dilatataf. 



globulosaf. 



perforata. 



spinosa. 



striataf. 



TurbiniUina italica (?), D^Orb. 



Excepting those from Poland, all the above and many 



* The first six and the eighth are " chalk" or " chalk-marl," or, rather, 

 cretaceous limestones ; 10 & 11 are white siliceo-calcareous earths, com- 

 posed of Diatoms and Polycystines, with relatively few Foraminifera ; and 

 12 is argillaceous. 



t These are the most abundant. 



