120 PEOCEEDIXGS OP THE GEOLOGICAL SOCIETr. [Jan. 24, 



5. RotaUnce from tJie Antwerp Crag. Beuss*, Sltzungsh. Alcad. 

 Wiss. Wien. vol. xlii. pp. 355 et seq. 1860. 



Planoebtjlina farcta (type). 



^ . , fPlanoi'bulina kalembergensis (D'O.). 



^°'^'°''^^ I PI. tenuimargo {Ess. pi. 1. f. 11). 



Plano-convex. Truncatulina varians, Bss. (PI. 2. fig. 12). Thick TV. lohatula, 

 01", rather, PL Ungeriana, subvar. 



PtTLYIKULINA EEPANDA (type). 

 "Auricula" group. Pulvinulina Brongniartii {U 0.). 



RoxALiA Beccarii (type). 



Botalia Parkinsoniana (D' 0.). E. orbicularis, D'O. 



These types and subtypes are comprised also in tlie foregoing list 

 of the Kotalines from the English Crag. 



§ XI. Conclusion. — ^^^ith reference to the Cretaceous Poramini- 

 fera, generally speaking, and as far as our observations lead us, we 

 may say that, excepting Discorhina Binldiorsti (Ess.), of the Maes- 

 tricht Chalk, there is no Discorhina known in this great series of 

 formations ; indeed that species seems to be the oldest of its genus. 

 Of the other Rotalin^, there are numerous deep-sea forms of JRotcdia, 

 PidvinuUna, and Planorhidina. A rare Calcarina in our White 

 Chalk, many in that of Maestricht, numerous Oi-bitolince {Titiojjorus 

 and Patellina) in some of the Cretaceous formations, and crowds of 

 Orbitoides in some Chalk-strata of Prance and elsewhere, complete 

 the Cretaceous Eotaline group. 



With the closely allied Globigerino}, on the one hand, and the Nodo- 

 sarince (including Cristellaria &c.) on the other, the Ehizopodist has 

 to deal largely when examining the Cretaceous rocks. In the former 

 case, individuals, innumerable and variable, predominate, increasing 

 in number upwards with the successive formations from the Neoco- 

 mian to the Gault, Chalk-marl, and Chalk, in England. In the 

 latter case the variations of all degrees and vakie become almost as 

 numerous as the individuals ; and these abound far more plentifully 

 than the PLotalines. Such of the latter as we have more especially 

 had to treat of in this memoir (namelj'', Planorhidinct, Pidvinulina, 

 and Potalia) are more equally distributed all through this series of 

 deposits. 



Taking them in succession, we find that the typical Planorbulina 

 is represented in all the columns of our Table. The subtype PI. 

 Maidingerii, taken as the leading form of the helicoid or conical Cre- 

 taceous forms, is represented in all the columns except 7, 10, 16, 18, 

 and 21. The jSTautiloid varieties, typified by PI. avimonoides, occur 

 in all except JSTo. 14. The plano-convex or Truncatuline varieties, 

 grouping around TrunccUidina lobatida, fail only in Kos. 5, 11, 18, 

 and 21. In all these cases the absence is probably not real ; further 

 search may supply such forms. 



T'he Pulvimdina type of Eotalinje is also well represented in 

 these Cretaceous deposits, as shown by our columns. Only No. 21 

 * ^See also Bullet, Acad. Roy. Se. Belg. vol. xr. p. 154; and further on, p. 127. 



