lO HALKYARD, Fossil Foraminifera of the Blue Marl 



(Halkyard apparently altered his opinion as regards the 

 identification of these specimens, for the slide labelled 6\ limbata 

 is empty and another, labelled " ?S. dorsata, Reuss" appears in 

 the collection, though not referred to in the MS. The few 

 specimens on the slide are more or less fragmentary casts, but 

 we have little hesitation in assigning them to 5. dorsata The 

 synonymies of the two forms have been referred to by us at some 

 length in our Kerimba monograph. (H-A & E. 1914, etc., 

 F.K.A. p. 554-)) 



Genus Miliolina, Williamson. 

 it. Miliolina seminulum (Linne.) 



Serpula seminulum, Linne, 1767, ed. 12, p. 1264, No. 791. 

 Quinqueloculina triangularis, d'Orb., 1826, Ann. Sci. Nat., 



vol. VII, p. 302, No. 34. 

 Miliolina seminulum, Brady, 1884, Chall. Rep., p. 157, pi. V, 



figs. 6 a, b, c. 



Not uncommon at Biarritz, the general type being short 

 and broad. The most robust specimens viewed from the side 

 have the contour of M. aub eriana, d'Orb., but are less angular 

 in transverse section than that species, which is intermediate 

 between M. seminulum and M. cuvieriana, d'Orb. This 

 broad form however is not constant, but in some instances 

 becomes more like the type, viz. : — longer in proportion to the 

 breadth ; such specimens are usually small. In another direction 

 it approaches M. circularis, Bornemann; and in yet another 

 it merges almost imperceptibly into M. venusta, Karrer. 



(There is considerable variety among the specimens assign- 

 ed to M. seminulum, many of which are calcite casts difficult 

 to identify with certainty, but the general type is of the variety 

 Quinqueloculina triangularis, d'Orb. (d'O. 1846. F.F.V. p. 288 

 pi. XVIII, figs. 7-9.)) 



12. Miliolina circularis (Bornemann). 



Triloculina circularis, Bornemann, 1855, Zeitschr. deutsch. 



geol. Ges. vol. VII, p. 349, pi. XIX, fig. 4. 

 Miliolina circularis, Brady, 1884, Chall. Rep., p. 169, pi. IV, 



fig. 3 a, b, c, and pi. V. fig. 13, 14? 



This species seems to replace M . seminulum in the low- 

 est beds of the pure marl, at any rate it only appears in gather- 

 ings 7, 8, and 9 taken in 1893, whilst the above-mentioned form 

 is at its highest development in Nos. 1, 2, and 3 Gatherings 



