EXPLANATION OF PLATE XI. 



Fig. 49. Coscinodiscus centralis, Ehr. 



— 50. Eupodiscus subtilis, n. sp., Ralfs. 



— 51. Campylodiscus centralis, n. sp. 



— 52. ... Ralfsii (?) Sm. 



Fig. 53. Campylodiscus angularis, n. sp. 



— 54 & 54 b, ... eximius, n. sp. 



— 55. ... limbatus, Br£b. 



All the above are magnified 400 diameters. 



