308 FORAMINIFERA OF THE CRAG. 



Truncatulina loeatula, B., P., and J., 188S. Trans. Zool. Soc, vol. xii, 



part 7, p. 227, pi. xlii, fig. 20; 

 pi. xlv, figs. 2(3 a — c. 



— — Steinmann, 1888. Elemente Palaont., vol. i, p. 29, 



figs. 11 A, B, c. 

 RosALiNA, sp., Beissel, 1891. Abhandl. k. Preuss. Geol. Landes., part 3, p. 74, 



pi. xiv, figs. .30—35. 

 Truncatulina lobatula, E(/ger, 1893. Abhaudl. k. Bayer. Ak. Wiss., vol. xviii, 



part 2, p. 396, pi. xvi, figs. 1—3, 10—12. 



— — Fornasini, 1893. Istit. Bologna, ser. 5, vol. iii, p. 435, 



pi. o, figs. 15, 15 a, 16, 16 fl. 



— — De Amicis, 1893. Boll. Soc. Geol. Ital., vol. xii, 



p. 414. 

 Planorbulina lobatula, Goes, 1894. K. Svensk. Vet.-Akad. Handl., vol. xxv, 



No. 9, p. 88, pi. XV, fig. 774. 

 Truncatulina lobatula, De Amicis, 1895. Nat. Sicil. Ann., xiv, pp. 52 and 63. 



— — Egger, 1895. Jahresb., xvi, Nat. Ver. Passaii, p. 31, 



pi. V, figs. 5 a — 0. 

 Planoebulina lobatula. Goes, 1896. Bull. Mus. C. Z, Harvard Coll., vol. xxix, 



p. 70. 



Characters. — Shell suborbicular, plano-convex, consisting of from two to three 

 convolutions, of which the oiitermost alone is visible on the convex surface. Each 

 convolution composed of seven or eight segments. Convex surface depressed at 

 the umbilicus. Segments ventricose on the upper, flat and truncate on the lower 

 surface of the shell. Orifice single, large, at inner margin of the terminal chamber. 

 Foramina conspicuous chiefly in young specimens. 



Occurrence. — Truncatulina lobatula is found in all seas and at all depths down to 

 3000 fathoms. It is the most common of the Rotaline Foraminifera. Its 

 geological range is also very great. Specimens have been obtained from rocks of 

 Carboniferous age ; and it is commonly met with in Mesozoic and later deposits. 

 As a Tertiary fossil its range is similarly wide, and the amount of attention that 

 has been bestowed upon it by naturalists may be seen from the table of synonyms 

 given above. 



In the Coralline Crag it is common in every zone we have examined; and it 

 has also been found in the Upper Crag, as recorded in the First Part of the 

 Monograph. 



