420 PEOCEEDINGS OF THE INDIANA ACADEMY OF SCIENCE. 



Genus Trifjonocarpum Brongniart 

 Trigonocarpum ovalum n. sj}. 

 PL VI, figs. 6a, 6b. 



Nutlet oval, slightly truncate at base, pointed at apex, broadly oval to 

 nearly round in cross section, 6-7 mm. in diameter, 12-13 mm. long, marked 

 from base to apex by three prominent ribs at an equal distance apart, base 

 marked by a round depression 3 mm. in diameter. 



Locality: Cincinnati. 



Trigonocarpum sp. 



Four other Trigonocarpum forms are shown in PL VI, figs. 9a-9b, 10, 

 11 and 12. Those forms were so imperfectly preserved that their determin- 

 ation was too doubtful to be of value. The forms shown in figs. 9a-9b and 

 10 have three ribs; and the forms shown in figs. 11 and 12 are hexagonal in 

 cross section. 



Locality: Cincinnati. 



Trigonocarpum cf. Schullzianuni Goep. and Berg. 

 Plate VI, fig. 7. 



Tliis species, although somewhat smaller, appears to agree closely with 

 Kansas forms descriljed by Sellards.'^ 

 Locality: Yoho Sch<^ol. 



Trigonocarpum luxagonalc n. sp. 

 Plate VI, figs. .5a, ob. 



Nut ovoid in outline, pointed at ai)ex, inuch truncated at base, about 1.5 

 centimeters long, <S mm. in diameter, hexagonal in cross section, with six 

 prominent ridges from base to summit; base marked l)y round depression 

 3 mm. in diameter and by 6 faint lines extending from the depression to the 

 six angles formed by the six sides. 



Locality: Cincinnati. 



Trigonocarpum hcxacodalum n. sp. 

 Plate VI, figs. 4a-4b. 



Xutlet broadly oval in outline, wedge shaped at apex, truncated at base, 

 hexagonal in cross section, 5 mm. in diameter, 7 mm. long, marked by six 

 rather i)rominent ridges from base to summit; base 3 mm. in diameter, marked 

 by a small depression and six rather faint lines from the depression to angles 

 of the hexagonal base. 



Locality : Cincinnati. 



15 Sellarris, E. H., Univ. Geol. Surve. Ks., Vol. IX, p. 428, PI. LFI, fig. 1; PI. LVIII, 

 fig. 3, 1908. 



