18 PROCEEDINGS OF THE NATIOISTAL MUSEUM vol.76 



EXPLANATION OF PLATES 



Plate 1 



Figs. 1, 2. Discocyclina iveaveri, new species. Fig. 1, embryonic and equatorial 

 chambers, X 80, paratype; fig. 2, vertical section, X 40, cotype. See 

 p. 5. 



3, 4, 4a. Discocyclina Weaveri var. parvipapillata, new variety. Cotypes. 

 Fig. 3, section obliquely through the equatorial plane, X 40; fig. 4, 

 vertical section, X 40; fig. 4a, part of vertical section, X 80. See p. 7. 



Plate 2 



Figs. 1, 2, Discocyclina cristensis (Vaughan) Vaughan. Plesiotypes. Fig. 1, 

 embryonic and equatorial chambers, X 80; fig. 2, vertical section, X 40. 

 See p. 8. 

 3, 4, 5, 5a. Discocyclina perpusilla, new species. Fig. 3, general views of 

 five specimens, X 10, cotypes; fig. 4, embryonic and equatorial cham- 

 bers, X 40, paratype; fig. 5, vertical section, X 40, paratype; fig. 5a, part 

 of vertical section, X 80, passage for stolon shown just inside the ver- 

 tical wall at the extreme left. See p. 9. 



Plate 3 



Discocyclina cushmani, new species 



Fig. 1, surface, X 15, cotype; fig. 2, part of equatorial plane of a split specimen, 



X 15, paratype; fig. 3 vertical section of umbo of a specimen, X 40, cotype; 



fig. 4, oblique section, some pillars cut longitudinally, others obliquely; cotype. 



See p. 11. 



Plate 4 



Figs. 1, 2, 3. Discocyclina zaragosensis, new species. Cotypes. Fig. 1, surface, 

 X 10; fig. 2, equatorial plane of a split specimen, X 10; fig. 3, vertical 

 section, X 20. See p. 13. 



4. Discocyclina palenquensis, new species, piece of rock in which there 

 are many specimens; cotypes (see also pi. 7). See p. 17. 



Plate 5 



Discocyclina cloptoni, new species. Cotypes 



Fig. 1, surfaces of two specimens, X 5; fig. 2, embryonic and equatorial cham- 

 bers, X 20; fig. 3, single embryonic chambers, X 20; fig. 4, double embryonic 

 chambers, X 20; fig. 5, quadruple embryonic chambers, X 20; fig. 6, vertical 



section, X 20. See p. 14. 



Plate 6 



Discocyclina stephensoni, new species. Cotypes 



Fig. 1, part of equatorial plane, surface reticulum, and pillars, X 20; figs. 2, 3; 

 4, vertical sections, X 20, to show variation in form. See p. 16. 



Plate 7 



Discocyclina palenquensis, new species. Cotypes 



Fig. 1, parts of the equatorial plane and surface of a specimen, X 20; fig. 2, ver- 

 tical section, X 20. (See also pi. 4, fig. 4.) See p. 17. 



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