Plate 90. 



Figs. !-!•. EhhijIdsIuiiicIUi si/nthctica, new species (p. 434). 



1 Three frngments, untural size, of the bifoliate zoarium. 



2 Surface of a zoarium. X 20. showiug normal characters of the zooeeia. \ broken 



ovicell is seeu in the left-hand portion, and a complete one in the lower part of 

 the same side. The rimnle spiramen and the .avicularium in the peristomie are 



visible. 



3. Zoarial surface. X 20, illustrating the irregularity due to the transformation of the 



tubules. Three different forms of avicularia may be noted. 



4. An interior of the zooecial frontal, X 20. with avicularian cavities exhibited. 



5 Anotlier interior, X 20. showing oriente<l zooecia and tubules perforating the olocyst. 



6 A zoarial surface, X 20, with zooecia unoriented and exhibiting small, simple avicu- 



laria (1), small avicularium with denticles (2), with pivot (3), large avicularia 

 with area (4) and without area (5). and large avicnlaiia with pivot (6). 



7 A surface, X 20, showing an extreme development of the tubules closing the apertures. 



8. Interior of frontal. X 20, of specimen figured in number 7, illustrating the simplicity 



of structure. 



9. Longitudinal fracture through zoarium, X 20. 

 Vicksburgian (Byram marl) : Byram, Mississippi. 



Cat. No. 64290, U.S.N.M. 

 Figs. 10-16. Enoplostomella rhomioi(lnU.s. new species (p. 436 K 



10. A group of the cylindrical bifoliate zoaria. natural size. 



11 Surface of a zoarium. X 20, with two zooecia exhibiting ovicells 



12. Zoarium, X 20. with well defined triangular avicul!#ia and with the line separating 



the zooecia much thickened. 

 13 Zooecia, X 20, with the separating ridges thickened only near the apertura. 



14. Another zoarium, X 20. with broad zooecia and salient separating ridges. 



15. Zoarium with narrow zooecia, X 20. 



16 Transverse feature, X 20, illustrating bifoliate character of zoarium. 

 Vicksburgian ("Chimney rock" of Marianna limestone) : One mile north of Monroe- 



ville, Alabama. 



Cat. iS"o. 64291, U.S.N.M. 

 Figs. 17-22 EnoplostomeUa Hf/nlifera, ne\v species (p. 437). 



17 Three fragments, natural size, of the free, cylindrical zoarium. 



18. Another specimen, X 20, with the rimule spiramen well develoi.ed and the avicularia 

 wanting. 



10. Surface of a zoarium, X 20, showing the long avicularia and the lateral tongue 



like processes of the peristomice. 



20. Interior of zooecial frontal, X 20, exhibiting the small scattered pores of the olocyst. 



21. Two zooecia with ovicells, X 20. 



22 Transverse fractures. X 20, illustrating structure of zoarium. 



' Vicksburgian (Red Bluff member) : Seven and one-half miles southwest of Bladon 

 Springs, Alabama. 

 I Cat. No. 64292, U.S.N.M. 



91 



