GENUS TRIOUITRITES 



39 



Triquitrites discoideus sp. nov. 



Plate 8, figure 3 



Description. — Spores are radial, trilete, 

 roundly triangular in transverse plane, 

 interradial margins convex, and have de- 

 finite arcuate thickenings. The holotype 

 measures 71.4 X 67.2 microns and the 

 known size range is from 63 to 74.5 mi- 

 crons. The arcuate thickenings measure 

 4.2 microns wide and 16.8 microns long. 

 They appear to originate at the equator of 

 the spore. The spore coat is ornamented 

 with short broad spine-like projections 

 which may be irregularly placed on both 

 proximal and distal surfaces. The trilete 

 rays are sharply defined and extend nearly 

 to the margin of the spore wall. The lips 

 are thin but elevated and the commissure 

 is thin but distinct. The spore coat, ex- 

 clusive of projections and arcuate thicken- 

 ings, varies in thickness from 3.6 to 4.2 

 microns. 



Holotype.— Maceration 542-B Slide 3, 

 Trivoli No. 8 coal bed, Peoria County, 

 Illinois. 



Discussion. — T. discoideus sp. nov. is 

 abundantly present in a number of Mc- 

 Leansboro coal beds. 



Triquitrites inusitatus sp. nov. 

 Plate 8, figure 7 



Description. — Spores are radial, trilete, 

 triangular in transverse plane, and the mar- 

 gin between rays is essentially straight. The 

 thickening (?) opposite the rays is unusual 

 since it is a series of several processes which 

 are projections of the spore coat. The holo- 

 type measures 65.1 X 67.2 microns exclusive 

 of the corner processes, and the known size 

 range is from 60.5 to 73 microns. The 

 processes (arcuate thickenings?) vary in 

 width since commonly two processes appear 

 to be fused whereas in length they average 

 slightly more than eight microns. The 

 spore coat is levigate to minutely granular. 

 The trilete mark, lips, and commissure are 

 distinct. The rays of the holotype vary in 

 length from 15 to 17 microns. The spore 

 coat varies in thickness from two to three 

 microns. 



Holotype.— Maceration 603-C Slide 4, 

 No. 2 coal bed, Fulton County, Ilinois. 



Discussion. — T. inusitatus sp. nov. is 

 characterized by unusual processes (arcu- 

 ate thickenings?). The processes appear to 

 be projections of the spore coat. 



Triquitrites pulvinatus sp. nov. 



Plate 8, figure 1 



Description. — Spores are radial, trilete, 

 and subtriangular in transverse plane. The 

 interradial margin is slightly convex, and 

 the arcuate thickenings are large and cush- 

 ion-like in appearance. The holotype meas- 

 sures 46.2 X 46.2 microns, and the known 

 size range is from 41.5 to 52.6 microns. 

 The arcuate thickenings of the holotype 

 vary in length from 16.8 to 21.5 microns 

 and in width from three to four microns 

 beyond the body cavity. The spore coat is 

 essentially levigate with a few scattered 

 small punctations present on some speci- 

 mens. The trilete rays are distinct and ex- 

 tend almost to the margin of the spore wall. 

 The lips are elevated and the commissure 

 is pronounced. The spore coat ranges in 

 thickness from 2 to 2.75 microns. 



Holotype.— Maceration 628-A Slide 4, 

 Murphysboro coal bed, Saline County, Illi- 

 nois. 



Discussion. — T. pulvinatus is charac- 

 terized by cushion-like arcuate thickenings. 

 This species is somewhat similar to T. 

 tribullatus (Ibrahim) S. W. and B., 1944, 

 but it is slightly different in shape and the 

 arcuate thickenings are shorter in length. 



Triquitrites priscus sp. nov. 

 Plate 8, figure 4 



Description. — Spores are radial, trilete, 

 and subtriangular in transverse plane. The 

 interradial margins are concave, and the 

 arcuate thickenings are distinct. The holo- 

 type measures 40.5 to 40.5 microns, and 

 the known size range is from 36 to 45 mi- 

 crons. The length of the arcuate thicken- 

 ings of the holotype varies from 20.4 to 

 21.4 microns and the width is less than 

 half the length. The spore coat has coarse- 



