I'l.ATE 47. 



Flos. 1, 2. Mctid/ifiii llii ? iilhiiiii. ut'W siit'c'ies (p. 301 K 



1. The uuiliiuielhir zojiriuiii. X 20. The .small lueaiau :ivicul;iriiuii. the white peristome 



aiul the four large tremopores about the apertura are the specific features. 



2. Sketch (if the apertura. 



Middle Jacksouiau (Castle llayne limestone) : Wilmington, North Carolin.-i. 

 Cat. No. 6408-1, U.S.N.M. 

 Fics. 3-0. Mctrojtrrirll<i firiitKlipora, new species (p. .302). 



3. Ordinary and ovicelled zooecia of the incrusting zoarinni. X 20. The frontal area 



of the latter is usually lo.st in fossilization. 



4. Small portion of an example with broad zooecia. X 20. 



5. Basal side of zoarium, X 20, with hydrostatic tuberosities. 



6. Surface of zoarium, X 20, exhibiting long zooecia. The avicularian zooecia with 



vestibular arch are visible near the top of the figure. 

 Middle Jacksonian (Castle Haj-ne limestone) : 'Wilmington, North Carolina. 

 Cat. No. 640G5, U.S.N.M. 

 Figs. 7-11. Jlrnvperit'lhi pnrosa. new species ( p.302i. 



7. Fragment of the free, bilamellar zoarium. natural size. 



S. Normal zooecia, X 20, bounded by a .salient thread. Two avicularian zooecia and a 



calcified one between them are to be noted in the upiier part of the tigui'e. 

 9. Another surface, X 20. with broken ovicells and long avicularia. 



10. An example. X 20, showing normal and ovicelled zooecia. 



11. Zooecia, X 20, preserving avicularia with a very long beak. 

 Middle Jacksonian: Near Lenuds Ferry, South Carolina. 



C-at. No. 640G6, U.S.N.M. 

 Figs. 12-19. Metropcriclhi 'biplanuta Cauu and Bassler. 1917 (p. .30 0. 



12. Wide zooecia, X 20, with salient margins. The avicularia .-ire broken. 



13. Fragments of the bilamellar zoarium, natural size. 



14. Normal fusiform zooecia, X 20. The pores of the frontal are very small. 



15. A well preserved zoarium, X 20, exhibiiing normal, ovicelled and closed zooecia. 



The ovicell completely surrounds the aiicrtur.i. 

 10. Elongate zooecia with marginal elevations, X 20. A crescent-shaped <-icatrix of 

 uidvnown use is above many of the zooecia. 

 17-19. Three sketches of the apertura, X 72, showing variation in outline. 



Middle Jacksouiau (Castle Hayne limestone) : Wilmington, North Carolina. 

 Cat. No. 62.J90, U.S.N.M. 

 Fig. 20. MctinpericIJa hitiporn, new species (p. 3e."ii, 



The bilamellar zoarium, X 20, with normal and ovicelled zooecia. 

 Middle Jacksonian : Iticli Hill, Crawford Comity, Georgia. 

 Cat. No. G4007, U.S.N.M. 

 48 



