40 



to 73 /x. The single specimen encountered 

 in this study is 39.5 /x in diameter. 



Triquitrites spinosus Kosanke, 1943 



The maximum size of Triquitrites spinosus 

 observed in this study is 71 xi, which is some- 

 what greater than the maximum size of 55 /x 

 reported by Kosanke (1943, p. 128). 



Triquitrites simplex Bhardwaj, 1957a 

 Plate 6, figure 15 



Triquitrites sp. 1 

 Plate 7, figure 1 



The spores are radial, trilete, triangular in 

 outline and have concave interradial margins. 

 The rays are distinct, straight, and about 

 two-thirds the length of the spore radius. 

 Auriculae at the corners are broad, rounded, 

 and notched at one end. With oil immersion 

 objective, the surface of the spore coat is 

 revealed as slightly rugose. The spore coat 

 is about 1.5 xi thick. 



Figured specimen. — Negative 4723 ; Trivoli 

 Cyclothem, maceration 1128-H, slide 21, co- 

 ordinates, 136.8 X 53.5; size, 34.3 by 34.3 p. 

 This species was also found in maceration 

 1175-1. 



Triquitrites sp. 2 

 Plate 7, figure 2 



The spore is radial, trilete, triangular in 

 outline, and has strongly concave interradial 

 sides and angular corners that are only slight- 

 ly thickened. The commissure is distinct and 

 the rays are about half the length of the spore 

 radius. Lips are absent. The spore coat, 

 about 1 /x thick, is covered with widely spaced 

 grana. 



Figured specimen. — Negative 4740; Trivoli 

 Cyclothem, maceration 1128-H, slide 18, co- 

 ordinates, 122.8 X 36.5; size, 28.2 by 26.6 /x. 



Triquitrites sp. 3 

 Plate 7, figure 3 



The spore is radial, trilete, triangular in 

 outline, and has angular corners and con- 

 cave interradial sides. The rays are distinct, 

 straight, and two-thirds to three-fourths the 

 length of the spore radius. The pyramidal 

 area is greatly thickened. Auriculae are thick, 

 have angular margins, and are about 3 /x long 



and 14 /x wide. Widely scattered, minute, 

 cone-shaped spines are present on the proxi- 

 mal and distal surfaces and along the margin. 



Figured specimen. — Negative 5854; Trivoli 

 Cyclothem, maceration 1175-P, slide 16, co- 

 ordinates, 127.8 X 44.3; size, 32.4 by 32.4 xi. 



Triquitrites sp. 4 

 Plate 7, figure 4 



The spores are radial, trilete, triangular 

 in outline, and have well rounded corners 

 and straight to convex interradial margins. 

 The rays are distinct, straight, and about 

 two-thirds the length of the spore radius. 

 Lips are absent. The spore coat is only slight- 

 ly thickened at the corners, and its proximal 

 and distal surfaces are irregularly reticulate 

 with low muri. The spore coat is about 1.5 /x, 

 thick. 



Figured specimen. — Negative 5761 ; Fithian 

 Cyclothem, maceration 1170-C, slide 10, co- 

 ordinates, 132.8 X 29.5; size, 48.0 by 48.0 xi. 

 This species was also found in maceration 

 1170-B. 



Triquitrites sp. 5 

 Plate 7, figure 5 



The spores are radial, trilete, triangular in 

 outline, and have well rounded corners and 

 concave interradial sides. The trilete rays 

 are distinct, straight, and about two-thirds 

 the length of the spore radius. Arcuate 

 thickenings are only slightly developed and 

 do not protrude. The interray areas are dis- 

 tinctly pitted, whereas other areas of the 

 spore coat are levigate. The exine is about 

 1 n thick. 



Figured specimen. — Negative 5892; Trivoli 

 Cyclothem, maceration 1175-G, slide 13, co- 

 ordinates, 137.7 X 35.0; size, 39.2 by 37.3 xt. 

 This species was also found in maceration 

 1175-C. 



Triquitrites sp. 6 

 Plate 7, figure 6 



The spores are radial, trilete, triangular in 

 outline, and have well rounded corners. The 

 rays are distinct, straight, and about three- 

 fourths the length of the spore radius. The 

 corners are only slightly thicker than the rest 

 of the spore coat. Blunt spines are sparsely 

 distributed over the distal surface. The exine, 



