FAMILY 45. ORBITOIDIDAE 345 



test is correspondingly quadrangular or many rayed. The ends 

 of the rays determine the shape of the test as seen in plan and 

 project beyond the margin of the interradial part of the test. 

 The initial embryonic chambers are reniform as in Discocyclina. 

 This is true of the species figured by H. Douville and of all the 

 American species of which I have examined the embryonic 

 chambers. 



Middle and upper Eocene. 



Genus LEPIDOCYCLINA Gtimbel, 1868 



Plate 56, figaire 11; plate 57, fibres 1, 3, 5-7; plate 59, figures 1-11 

 Genolectotype, Nummulites mantelli Morton 

 Lepidocyclina GiJMBEL, Abhandl, k. bay. Akad. Wiss., vol. 10, 1868, p. 689. 

 Lepidocyclina P. Lemoine and R. Douville, Mem. See. Geol. France, 



Mem. no. 32, 1904, 41 pp., 3 pis. 

 Lepidocyclma Cushman, U. S. Geol. Survey Prof. Paper no. 125, 1920, 



pp. 55-105, pis. 12-35. 

 Lepidocyclina H. Douville, Mem. Soe. Geol. France, n. .ser., vol. 1, Mem. 



no. 2, 1924, pp. 1-49, pis. 5, 6, 48 text fig-s.; Ibid, vol. 2, Mem. no. 2, 



1925, pp. 51-123, pis. 3, 4, text figs. 49-83. 

 Lepidocyclina Vaughan, Bull. Geol. Soc. Amer., vol. 35, 1924, pp. 794- 



802, 807-812, pi. 30, figs. 1-3, pis. 31-35, pi. 36, figs. 1-3; Proc. Acad. 



Nat. Sci. Phila., vol. 79, 1928, p. 299, pi. 23, figs, la, Ih, 2/ 



Test flat to inflated, lenticular, circular, selliform, or stellate. 

 Surface glabrous or papillate, with or without costae or radial 

 ridges. Embryonic chambers normally of one of five types : (a) 

 Several large chambers, as many as 4 or 5, 2 or more of which 

 are subequal in size, (b) One large chamber with several smaller 

 chambers around its periphery, (c) Two equal or subequal 

 chambers, adjacent to which there are smaller accessory cham- 

 bers, intermediate in size between the embryonic and the nor- 

 mal equatorial chambers, (d) Two unequal embryonic cham- 

 bers, the larger of which partly embraces the smaller, (e) Two 

 unequal chambers, the larger of which extends entirely around 

 the smaller except at the place of attachment of the smaller to 

 the inside of the wall of the larger. Chamber walls pierced by 

 cribriform perforations. Equatorial chambers in concentric 

 rings, which are modified in the species with stellate tests. The 

 chambers in one ring usually alternate in position with those in 

 adjacent rings in such a way as to produce intersecting, out- 

 wardly convex curves. According to their shape as seen in plan, 



