33 



slide 9, coordinates, 137.4 x 32.3; size, 48.6 

 by 46.0 /a. 



Comparison. — Punctatisporites breviorna- 

 tus is slightly larger and has a considerably 

 thicker exine than P. orbicularis Kosanke, 

 1950, which it resembles. 



Derivation of name. — The epithet for the 

 species refers to its being ornamented {or- 

 natus) with small (brevi) puncta and grana. 



Punctatisporites corona sp. nov. 

 Plate 4, figures 16-17; text figure 9 



Diagnosis. — The spores are radial, trilete, 

 circular in outline, and usually folded. The 

 trilete rays generally are visible but not al- 

 ways distinct because of ornamentation and 

 folding. They are about three-fourths the 

 length of the spore radius and without lips. 

 The surface of the spore coat is covered with 

 fine papillate to obvermiculate projections 

 closely and uniformly spaced. The projec- 

 tions are narrow at their bases and widen 

 toward the ends so that their extension be- 

 yond the spore margin produces a halo-like 

 effect (text fig. 9). They are about 2.5 p. 

 long, and in end view are 1 to 4 /a in diam- 

 eter. Approximately 100 projections can be 

 counted at the margin. The spore coat is 

 thin — 1.5 to 2 /a thick. Dimensions (18 speci- 

 mens) : size range, 68.1 to 85.6 /a in maxi- 

 mum diameter; median, 77.3 /a (not includ- 

 ing ornamentation) . 



•--. 'Wmw&% 



FIG. 9 — Diagrammatic detail of portion of exine 

 of Punctatisporites corona sp. nov. 



Holotype. — Plate 4, figure 16; negative 

 6111; Henshaw Formation, maceration 1122- 

 Q, slide 44 ZB, coordinates, 141.1 X 40.6; 

 size, 73.9 by 71.3 /a (not including ornamen- 

 tation) . 



Paratype. — Plate 4, figure 17; negative 

 6433; Henshaw Formation, maceration 1122- 

 Q, slide 45 ZB, coordinates, 139.5 x 34.8; 

 size, 83.9 by 78.7 aa. 



Derivation of name. — The species name re- 

 fers to the halo {corona) effect produced by 

 the projections at the spore margin. 



Punctatisporites transenna sp. nov. 

 Plate 4, figures 18-19 



Diagnosis. — The spores are radial, trilete, 

 subcircular to roundly triangular in outline, 

 and usually in good proximal-distal orienta- 

 tion. The trilete rays are distinct, straight, 

 and at least three-fourths the length of the 

 radius (15 to 30 /a long) . The lips on either 

 side of the commissure are about 1 /a wide. 

 Proximal and distal surfaces of the spore coat 

 are ornamented with flat, obvermiculate 

 ridges that are usually slightly narrower at 

 their bases than at their ends. Most of the 

 ridges, 2 to 3 /a high and about 2 /a wide, are 

 joined to form an irregular reticulate pattern. 

 The largest lacuna between the ridges is 

 about 5 fi in diameter. The ornamentation 

 extends beyond the spore margin and is often 

 almost continuous around the periphery, al- 

 ternating between light translucent areas in 

 which the ridges are parallel to the margin 

 and dark areas in which the ridges are trans- 

 verse to the margin. The spore coat is so 

 thin (1 to 1.5 /a) that it is difficult to focus 

 on either the proximal or distal surface with- 

 out picking up the ornamentation from the 

 other surface. Dimensions (12 specimens) : 

 size range, 42.1 to 55.4 /a in maximum di- 

 ameter; median, 48.7 ai (not including orna- 

 mentation) . 



Holotype. — Plate 4, figure 18; negative 

 6474; Fithian Cyclothem, maceration 1170-G, 

 slide 7, coordinates, 133.2 X 40.4; size, 44.5 

 by 32.9 /a (not including ornamentation). 



Paratype. — Plate 4, figure 19; negative 

 5754; Fithian Cyclothem, maceration 1170-G, 

 slide 6, coordinates, 137.0 X 43.0; size, 48.6 



by 44.1 p. 



Derivation of name. — The species name re- 

 fers to its reticulate ornamentation, which is 

 like a net {transenna). 



Punctatisporites grandivermiculatus sp. nov. 

 Plate 4, figures 20-21 



Diagnosis. — The spores are radial, trilete, 

 subcircular to circular in outline, and usually 

 in good proximal-distal orientation. The rays 

 are one-half to two-thirds the length of the 

 spore radius (28 to 39 /a), straight, and indis- 

 tinct when viewed from the distal surface 

 because of their great thickness and orna- 

 mentation. The lips are low and narrow. 



