10 FORAMINIFERA OF THE CRAG. 



re-named so frequently as the little shell now luider notice. We may look upon this as the 

 true specific type to which the whole of the varieties of the Miliolce belong, although 

 for convenience we confine the use of the name to the particular form of shell indicated by 

 the general characters above given. As might be supposed, its distribution is world-wide 

 — scarcely a sample of sea-sand, either dredged or littoral, from any quarter of the dobe, 

 can be examined without finding specimens of it. In the Crag deposits we have it, in Mr. 

 Searles Wood's collection, fiom Sutton, very large and common ; from Gedgrave and 

 Sudbonrne ; and from the Red Crag of Essex. From the Bridlington Crag we have many 

 specimens, for which we are indebted to Mr. H. C. Sorby. Quinqueloculina seminulum 

 is common in the Grignon Beds of the Paris Basin, and in many subsequent Tertiary 

 strata. Varieties of Q. seminulum occur also in the Cretaceous deposits. 



2. Quinqueloculina triangularis, B'Orh'igny. Plate IV, fig. 1. 



Quinqueloculina triangularis, D'Oib., 182f). Ann. Sc. Nat., vol. vii, p. 302, No. 34. 



— — M, 1846. For. Foss. AHen., p. 288, pi. 18, figs. 



7—9. 

 MiLiOLA (Quinqueloculina) seminulum, Par/cer and Jones, 18G.5. Phil. Trans., vol. cIt, 



p. 410, pi. 15, figs. 35a, 3.")6. 



Characters. — Shell oval, convex ; end-view more or less triangular. Colour, white to 

 yellowish-brown. Length, T^^th inch. 



A few large angular Quiuqucloculine Miliolce occurring in tlie Lower Crag of Sutton, 

 together with some smaller specimens from the " Crag with Polyzoa," and others from 

 the Bridlington Crag, seem to claim separation from the typical furni, and may be taken 

 together conveniently, with D'Orbigny's name trianrjularis, as a sub-varietal designation. 



They present the nearest approach we have in the Quinqueloculine series to 

 the angular condition represented by Blloculina depressa and Trilocidina iricarinafa, in 

 their respective subgenera, although the margins of the chambers present somewhat 

 softened angles, rather than any prolongation into carinae. Miliolce with these characters 

 are to be found in the Mediterranean, the Red Sea, the South Atlantic, the Pacific, and 

 the Lidian Oceans, and, as fossils, in the Tertiary clays of the North of Italy, and the 

 Vienna Basin. In some of these localities they appear to take the place of the typical 

 Miliola {Quinqueloculvm) seminulum. 



Quinquelocidina semiplana, Reuss, ' Zeitsch. Deutsch. Geol. Ges.,' vol. vii, p. 275, pl.lO, 

 fig. 1 (from the Chalk of Mecklenburg), can scarcely be distinguished from Q. irianfjularis. 



The difficulty of drawing definite lines among the varieties and sub-varieties of Miliola 

 will be readily realised, if we endeavour to work out the synonymy of such Quinque- 

 loculince as are typified by Q,. triangularis; D'Orbigny's Q. Lamar ckiana ('For. Cuba,' 

 pi. 11, figs. 14, 15) ; Q,. Auheriana (Ibid., pi. 12, figs. 1—3) ; Q. Buchiana ('For. Fos. 



