INDIANA PALEONTOLOGY. m. 



ALVEOLITES DISPANSA. N. Sp. 



Plate 40. Figs. 1, 2, 3. 



Corallum below medium size. Thin undose, discoid expansions. With a 

 strong wrinkled epithecal crust on the under basal side. When decorticated 

 the prostrate tubes may be seen radiating from a central axis. Orifices ob- 

 lique, from one to two millimeters wide, and slightly more in some tubes, and 

 one millimeter in height, varying somewhat in dilferent corallums, and 

 sometimes in the same example. Pores large, round, in one and two rows, 

 situated near the angles of the tubes. Spinulose crest strongly pronounced, 

 from two to four rows in a tube. Tabula flat or oblique, well defined, not very 

 ^uch crowded. 



The thin undose expansion, and the strong wrinkled epithecal crust, and 

 the broad oblique orifices, will readily distinguish this from all other species in 

 the Hamilton group. 



Found in the Upper Devonian (Hamilton group) near Charlestown, and in 

 the stripping^ above the cement rock, throughout Clark county, Indiana. Now 

 iu the collection of the author. 



ALVEOLITES S U B AN G UL AR I S . N. Sp. 



^ Plate 40. Figs. 4, 5, 6. 



Corallum variable in size, from thin undose, discoid expansions, to large 

 «onvex or sub-hemispherical masses. With a thin imperfectly developed epith- 

 €ca on the under side. Orifices opening oblique, from one to one and a half 

 millimeters in width, and one millimeter in height, and frequently the width 

 «.nd height are the same, giving to the tubes a somewhat angular appearance. 

 The spinulose crests are strongly developed in some corallums, appearing as 

 small spikes, while in some others they are only faintly indicated, or are en- 

 tirely absent. Pores small, round, one and rarely two rows, situated near the 

 angles of the tubes. Diaphragms numerous, and closely arranged. 



The sub-angular tubes, and the numerous and closely arranged diaphragms 

 will distinguish this from all other species in the Hamilton group. 



Found in the Upper Devonian (Hamilton group) near Charlestown, and 

 in the strippings above the cement rock, throughout Clark county, Indiana. 

 Now in the collection of the author. 



