17 



Convolutispora venusta Hoffmeister, 



Staplin, & Malloy, 1955a 



Plate 1, figure 15 



Convolutispora sp. 1 

 Plate 1 3 figure 16 



The spore is radial, trilete, and subcircular 

 in outline. The rays, which are partly ob- 

 scured by ornamentation, are about 36 [i 

 long. The entire surface of the spore coat is 

 covered with flat, truncated spines, 4 to 5 /x 

 in diameter and about 6 fi long. They are 

 joined to form ridges almost in a reticulate 

 pattern. Minute spines occur at the ends of 

 the major spines. The exine is about 4 /x 

 thick. 



Figured specimen. — Negative 5749; Fithian 

 Cyclothem, maceration 1170-C, slide 16, co- 

 ordinates, 143.0 X 43.0; size, 88.5 by 81.1 /x. 



Convolutispora sp. 2 

 Plate 1, figure 17 



The spore is radial, trilete, and subcircular 

 in outline. Its trilete rays are distinct and 

 about two-thirds the length of the spore ra- 

 dius. The lips are 1 /x wide on either side of 

 the suture. The surface of the spore coat is 

 covered with flat ridges 3 to 5 /x wide and 

 about 1 fi high. 



Figured specimen. — Negative 5669; Hen- 

 shaw Formation, maceration 1122-Z, slide 25 

 ZB, coordinates, 124.0 X 48.4; size, 51.6 by 

 45.4 fi. 



Genus Crassispora (Bhardwaj, 



1957a) Bhardwaj, 1957b 



Plate 1, figure 18; plate 2, figures 1-2; 



text figure 4 



Type species. — Crassispora (Planis pontes) 

 ovalis (Bhardwaj, 1957a) Bhardwaj, 1957b. 



Affinity. — Unknown. 



Crassispora plicata sp. nov. 



Plate 1, figure 18; plate 2, figures 1-2; 



text figure 4 



Diagnosis. — The spores are radial, trilete, 

 and roundly triangular to subcircular in out- 

 line. The spore coat is nearly always folded 

 or torn, usually more or less parallel to the 

 margin, to form an irregular, discontinuous 

 thickened zone (text fig. 4) . The equatorial 



margin of an inner membrane, which pos- 

 sesses apical papillae, sometimes can be seen 

 inside and parallel to the margin of the spore 

 exine. The trilete rays, about three-fourths 

 the length of the spore radius, are usually 

 indistinct, and the commissure may be either 

 open or closed. Lips are absent, but folds 

 along the rays may appear to be lips. Apical 

 papillae, about 3 ^ in diameter and height, 

 are very conspicuous. The distal surface and 

 margin of the spore coat are covered with 

 coni of various sizes (generally about 1.5 [i 

 long and 1 li in diameter) distributed rather 

 uniformly at least 1 [i apart. From 50 to 60 

 coni can be counted along the margin. The 

 surface of the spore coat appears minutely 

 and intensely punctate between the coni when 

 viewed under oil immersion objective. The 

 proximal surface, which is so thin that it can 

 be seen only under oil immersion, also is 

 minutely punctate but lacks coni. The exine is 



FIG. 4 — Crassispora plicata sp. nov. ; diagram- 

 matic reconstructions. 



A. View from proximal side with grana show- 

 ing through from distal surface. 



B. Cross section through spore along X — X'. 

 Proximal surface of exoexine not shown. 



