41. INDIANA PALAEONTOLOGY. 



FAVOSITES CLAVATULUS, N. Sp. 



Plate 15. Fig. 1-2-3. 



Corallum composite, from thirty millimeters, to eight inches or more in 

 length. Diameter, nearly the same throughout the entire length, not exceeding 

 thirty millimeters in its greatest width. Tubes rounded, polygonal, unequal in 

 size, from one to two and one-half millimeters in diameter. Walls thin, and 

 comparatively smooth, pores round, rather large, not closely arranged, one and 

 two rows on a side ; where there is two rows they are slightly alternating in 

 position; tabulse flat or slightly oblique. Between the tabulae there are a few 

 :Spine like projections, but do not extend to the center of the tubes. 



There is no other species, in the Corniferous group, that could be mistaken 

 for this one; the long, slender mode of growth, the thin walls, and the large 

 pores, makes this easily recognized from all other species. 



Found in the lower Devonian (Corniferous group) at the Falls of the 

 ■Ohio. Now in the collection of the author. 



FAVOSITES ROTUNDUS, N. Sp. 



Plate 15. Figs. 4-5-6. 



Corallum composite, variable in size, from one to six inches in diameter, 

 round or hemispherical, or sub-hemispherical; some examples, have a diameter 

 of five or six inches, and a thickness not exceeding one inch. With a strong, 

 wrinkled epithecal crust on the basal side. Tubes rounded, polj^gonal, unequal 

 in size, from one to three millimeters in diameter, or slightly more in some 

 tubes. Walls rather thick, somewhat smooth. Pores rather large, round, 

 from one to three rows on a side. Tabula) flat, or oblique, in some places very 

 much crowded, in others more distant. 



Some examples have the appearance of Favosites Hemisphericus (Yandell 

 & Shumard) but on comparison, there is a marked difference in the variation, of 

 the size of the tubes, and the number of rows of pores. From Favosites Tu- 

 berosus (Rominger) it differs in the mode of growth, and the number of pores, 

 and the tubes are not so complicated with squamaj, as in F. Tuberosus. 



Found in the lower Devonian (Corniferous group), at the Falls of the 

 Ohio. Now in the collection of the author. 



