45 



Figured specimen. — Negative 5580; Hen- 

 shaw Formation, maceration 1122-A, slide 16 

 ZB, coordinates, 125.3 X 45.4; size, 35.7 by 

 33.4 p. 



Spore H 

 Plate 8, figure 6 



The spores are radial, trilete, roundly tri- 

 angular in outline, and have well rounded 

 corners and concave interradial sides. The 

 rays are distinct, straight, and extend to the 

 inner margin of the thickened equatorial 

 zone. Lips are poorly developed. The proxi- 

 mal surface of the spore coat is smooth, but 

 the distal surface of the body and the thick- 

 ened zone are ornamented with numerous 

 pointed to rounded spines connected by 

 ridges. 



Figured specimen. — Negative 6428; Fithian 

 Cyclothem, maceration 11 70- A, slide 10, co- 

 ordinates, 127.1 x 42.4; size, 55.1 by 49.0 ju. 

 This species was also found in macerations 

 1170-B and 1170-G, in maceration 1175-D of 

 the Trivoli Cyclothem, and in macerations 

 1122-Z and 1122-F of the Henshaw Forma- 

 tion. 



Spore I 

 Plate 8, figure 7 



The spores are radial, trilete, roundly tri- 

 angular in outline, and usually folded. The 

 rays are distinct and extend about three- 

 fourths the length of the spore radius. Lips 

 are thin and sinuous. Large, conspicuous, 

 apical papillae are present. The spore coat, 

 less than 1 [i thick, is levigate. These spores 

 may be bodies of Endosporites or detached 

 portions of other spore taxa. Dimensions: 

 about 30 to 58 /x in maximum diameter. 



Figured specimen. — Negative 6512; Trivoli 

 Cyclothem, maceration 1175-J, slide 10, co- 

 ordinates, 131.1 X 32.3; size,'52.0 by 38.7 /x. 

 This form was also found in macerations 

 11 70- A through 1170-C of the Fithian Cy- 

 clothem and in macerations 1122-A and 

 1122-E through 1122-T of the Henshaw For- 

 mation. 



Spore J 

 Plate 8, figure 8 



The spore is radial, trilete, triangular in 

 outline, and has well rounded corners. The 



rays are distinct, straight, and about two- 

 thirds the length of the spore radius. Lips 

 are about 1 /x wide on either side of the 

 commissure. Flat, rectangular processes about 

 5 /x wide are widely distributed on the proxi- 

 mal surface. Two or more minor projec- 

 tions occur at the ends of the processes. 

 Under oil immersion objective, the surface 

 of the spore coat is visibly levigate between 

 the processes. The exine is about 1 /x thick. 



Figured specimen. — Negative 5559; Hen- 

 shaw Formation, maceration 1122-A, slide 5 

 ZB, coordinates, 124.0 X 44.6; size, 48.0 by 

 42.5 /x. 



Spore K 

 Plate 8, figure 9 



The spore is radial, trilete, and roundly 

 triangular in outline. The distinct trilete rays 

 extend to the spore margin. Opposite the 

 interradial sides are large auriculae, the larg- 

 est of which is 9 /x long. The exine is smooth 

 and about 1 /x thick. 



Figured specimen. — Negative 5443; Hen- 

 shaw Formation, maceration 1122-Q, slide 4 

 ZB, coordinates, 123.7 X 35.3; size, 35.1 by 

 29.2 [jl (not including auriculae) . 



Spore L 

 Plate 8, figure 10 



The spore is radial, trilete, and subcircu- 

 lar in outline. The rays are distinct, straight, 

 and about 19 /x long. The surface of the 

 spore coat is covered with long, anastomosing, 

 and branching vermiculations, or grooves, 

 about 1 /x wide. One vermiculation meas- 

 ured is at least 33 /x long. 



Figured specimen. — Negative 5556; Hen- 

 shaw Formation, maceration 1122-A, slide 5 

 ZB, coordinates, 144.2 X 33.9; size, 49.0 by 

 44.1 /x. 



Spore M 

 Plate 8, figure 11 



The spore is radial, trilete, and subcircu- 

 lar in outline. The commissure is distinct, 

 sinuous, and about two-thirds the length of 

 the spore radius. Lips, about 1.5 /x wide, 

 are on either side of the commissure. A 

 wide, slightly thicker and darker zone in the 

 area of the rays extends to the margin. The 

 spore coat is about 2 /x thick. 



