52 NORTH AMERICAN INDEX FOSSILS. 



g. Epitheca wanting, columella papillose L. Pleurocora. 



Iff Columella absent h. 



h. An inner wall present , ff. 



ff. Wall often incomplete, septa carinated. 



XXV. Craspedophyllum. 



ff. Wall complete, septa not carinated 4. 



4. Inner tube small, stems uniting by epithecal prolongations. 



XXII. Eridophyllum. 

 4. Inner tube ratber large, stems without epitbecal prolongations 



XXIV. Diplophyllum. 



h. Inner wall wanting , gg. 



gg. With epithecal proliferations, septa extending to near center. 



XXIII. SynaptoPhyllum. 

 gg. Without epithecal proliferations, septa in form of short vertical 



ridges VII. Pycnostyhis. 



gg. Without epithecal proliferations, septa well developed. 



XLIX. Cladophyllia. 



** Septa absent or represented by spines or faint ridges tttt* 



fftt Encrusting or attached by whole under side , i. 



i. Pipe-like, buds regular, single or double from near end of parent 



colony XXX. Aulopora. 



i. Cylindrical, irregular branching, on crinoid stems. 



XXXIII. Monilopora. 



fftt Free or only basally attached k. 



k. Branches in numerous parallel bundles of thin cylindrical tubes hh. 



hh. Branches distinct but united by hollow cross tubes at intervals. 



Interior with funnel-shaped tabulae. XXXIV. Syringopora. 



hh. Tubes united by their sides, forming a chain work. Septa 



sometimes quite strong XLIV. Halysites. 



k. Branches thin, regular or irregular, but not in parallel bundles it. 



ii. Branches in verticils, remote tabulae and occasional mural pores. 



XXXI. Romingeria. 

 ii. Branching by bifurcating, dendroid or irregular ; wall reinforced 



by coarse cysts XXXII. Ceratopora. 



ii. Branching dendroid or irregular, wall dense, under high power 



appears reticulate XXXIII. Monilopora. 



k. Branches coarse, commonly irregular ; interior coarsely cystose. 



28. Cystiphylhtm aggregatum. 

 C. Coral compound forming heads, expansions or branching stems of numerous con- 

 tiguous corallites ***. 



*** Heads of cylindrical tubes 5f. 



5f Tubes without septa or with septal ridges or spines /. 



/. Tubes united by porous cross branches 1 XXXIV. Syringopora. 



I. Tubes united by vesicular ccenenchyma XLV. Lyellia. 



I. Tubes united by their sides and forming chains XLIV. Halysites. 



I. Tubes united by their own expansions at intervals. 



XXXVIII. Chonostegites. 



5f Tubes with well developed septa m. 



m. Tubes united by epithecal proliferations kk. 



kk. Tubes with inner wall XXII. Eridophyllum. 



kk. Tubes without inner wall XXIII. Synaptophyllum. 



