279 



obli(iue, oviil, suiTouiHlod hy iiicsupoi-cs : Ihc Inn.-iriiim is (Icvclopcd into a 

 prominent hood-structure. 



CcrnmoporcUa graniUs u. sp. Plate I, Fifis. 4 (;. The coh)ny ^rows into 

 Aery irreguhnr small masses, epitheeated below and comijosed of superim- 

 posed contorted layers. Zooecial apertures are l)ut slightly oblique, gen- 

 onilly appearing somewhat rhomboidal at the surface. The lunariura is 

 tliick but not very prominent in the specimen described. It occupies onc- 

 lliird of the circumference of the aperture. Maculae are scarcely distin- 

 iiuishaltle. The interior walls are rather thick, including numerous rounded 

 mesopores ; the innnber of these varying, however, in different parts. The 

 zooecia are subovate with irregul.-iily liiniinatcd walls; diaphragms are 

 wanting. 



This species is distinguished from C. rol)i(,sta by its inconspicuous maculae, 

 somewhat smaller and exteriorly less roinided cells and more numerous 

 mesopores. The latter are I'arely seen at the surface, being apparently in- 

 cluded within the subquadrate zooecial wall, for which reason the species is 

 probably related to C. Iriclusa and ('. iru/oiuo, but separated from those 

 species by its laminae gi'owth. thicker layers, heavier walls and less oblique 

 ai">ertures. The orifices of C. ffnnidis are not bidenticulate as in C. inclusa 

 .111(1 C. ingenua. 



Occurrence: Pierce limestcnic. Murfreesboro. Tennessee. 



Holotype : 545S1 U. S. Nat. Mus. 



Ceramoporella inge^ma n. sp. Plate I. Figs. l-H. The zoarium forms thin 

 laminae, contorted, covered below by a concentrically striated epitheca ; as 

 far as observed it does not grow in superposed layers. The cell is of the C. 

 hirJuxa type, the elliptical zooecial aperture itself together with generally 

 three mesoiwres being included within a raised rim somewhat rhomboidal 

 in outline. Maculae are quite inconspicuous. 



C. ingenua is distinguished from C. inclusa by free habit of growth and 

 larger zooecial spaces, these being as 3:4 or 4:5. The walls of C. ingenua 

 are somewhat thicker than C. inclusa. 



In C. grandis the cell mouths do not show the mesopores and the ovate 

 zooecial aperture as in G. ingenua. 



Occurrence: Pierce limestone. .St(mes River group. Murfreesboro, Ten- 

 nessee. 



Holotype : 54579 U. S. Nat. Mus. 



Genus GoeloeJema T'lrich. Genotyiw : Diamesopora vaupeli Ulrich. 



Coelocloma TUrich. Jour. Cincinnati Soc. Nat. Hist., 5, 1SS2, p. 1.37 : 7, 

 1884. p. 49 (not defined). Nickles and Bassler, Bull. U. S. Ceol. Surv., 173, 

 1!K)(h pp. 24, 211. Bas.sler, Bull. IJ. S. Geol. Surv.. 292. 190G, p. 21. r,ral)au 

 Mild Shinier, N. A. Index Fossils, 1, 1907, p. 122. Cunnings, 32d Ann. Kept., 

 I>ept. Geol. Nat. Res. Indiana, 1908, p. 742. Ba.ssler. Bull. IT. S. Nat. Mus., 

 77. 1911, p. 83; Zittel-Ea.stman Textb. Pal.. 1913, p. 328. 



Diamesopora (part) Ulrich, Geol. Surv. Illinois, 8, 1890, pp. 380, 467; Geol. 

 Minnesota, 3, 1893. p. 330; Zittel's Textb. Pal. (Engl, ed.), 189G, p. 2GS. 



Zoarium forms hollow branches lined with a striated epitheca ; zooecia 



