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Frances L. Parker 



synonymous with, G. elongata (d'Orbigny) and G. helicina (d'Orbigny), reported by 

 d'Orbigny from Rimini, Italy, G. adriatica (Fornasini), and G. rubra vslt. pyramidalis 

 (vanden Broeck). G. sacculifera includes a form listed by various authors as G. triloba 

 (Reuss) and described by Reuss from the Miocene of the Vienna Basin. Specimens of 

 Globigerina eggeri are small but otherwise typical except for Aegean specimens which 

 frequently have a final whorl consisting of 3i chambers. The latter are similar to 

 G. bulloides and further study may modify the ratios of the two species in Aegean Sea 

 samples. Hastigerina pe/agica, not reported from the Atlantic in significant numbers, 

 is found in low frequencies chiefly in the eastern Mediterranean. 



The relative percentages of the planktonic species are listed in Table I. Included in 

 this table, for comparative purposes, are data for three stations from the Atlantic in 

 the general vicinity of Gibraltar. The data for stations 4637 and 4736 are taken from 

 Phleger, Parker and Peirson (1954). The following discussion deals only with 

 occurrences as they appear in this table. Species with frequencies of less than 0-2%, 

 therefore, are not included although they may occur. The sampling is sparse for such 

 a large area but the percentage data show clearly that there are three distinctive 

 populations. The first of these is that of the western Mediterranean which extends east 

 to include station 4721 A. This assemblage differs from that of the adjacent mid- 

 latitude Atlantic in the following ways: 



Atlantic (mid-latitude) 



Western Mediterranean 



The second assemblage is found in the eastern Mediterranean. It differs from that 

 of the western area in the following ways : 



Western Mediterranean Eastern Mediterranean 



Globigerina bulloides 



G. inflata 



Globigerinoides rubra 



G. sacculifera 



Globorotalia truncatulinoides 



Hastigerina pelagica 



20-56% 



14-38% 



1-25% 



1-5% 



less than 1-14 >; 



at 1 sta. 



8-18% 



0-6% 



41-77% 



3-14% (except 4 stas.) 



0-2 % (scattered) 



consistent occurrence 



