15 



three-fourths as long as the spore radius, that 

 are interpreted as rays. Area contagionis is 

 absent. The exine has a glistening rugose and 

 waxy appearance under both high dry and 

 oil immersion objectives. The spore coat is 

 2 to 2.5 ll thick. Dimensions (20 specimens) : 

 size range, 54.4 to 84.2 ll in maximum diam- 

 eter; median, 67.8 ll. 



Holotype. — Plate 1, figure 5; negative 5809; 

 Fithian Cyclothem, maceration 1170-A, slide 

 1, coordinates, 131.7 X 51.4; size, 65.8 by 

 61.6 ll. 



Paratype. — Plate 1, figure 6; negative 6467; 

 Fithian Cyclothem, maceration 1170-A, slide 

 24, coordinates, 132.4 X 54.0; maximum di- 

 ameter, 68.3 ll. 



Discussion. — Specimens of Calamospora 

 obscura absorbed the stain only slightly, if at 

 all, whereas other spores in the same macera- 

 tion were deeply stained. 



Derivation of name. — The specific name 

 refers to the indistinct {obscura) rays. 



Calamospora pusilla sp. nov. 

 Plate 1, figures 7-9 



Diagnosis. — The spores are radial, origi- 

 nally spherical, and characterized by an 

 abundance of small and usually evenly dis- 

 tributed folds. Several specimens displayed 

 faint trilete rays that would be very difficult 

 to find on most specimens because of the in- 

 tense folding. The surface of the spore coat 

 is essentially smooth but appears slightly 

 rugose when viewed under oil immersion ob- 

 jective. The exine is 1 ju, or less thick. Dimen- 

 sions (60 specimens) : size range, 23.0 to 

 38.9 ll in maximum diameter; median, 30.0 ll. 



Holotype. — Plate 1, figure 7; negative 6514; 

 Trivoli Cyclothem, maceration 1175-G, slide 

 23, coordinates, 129.0 X 38.0; size, 31.2 ju in 

 maximum diameter. 



Paratypes. — Plate 1, figure 8; negative 

 6513; Trivoli Cyclothem, maceration 1175-G, 

 slide 15, coordinates, 136.3 X 51.5; size, 30.2 ll 

 in maximum diameter. Plate 1, figure 9, neg- 

 ative 5858; Trivoli Cyclothem, maceration 

 1175-G, slide 2, coordinates, 143.8 X 38.1; 

 size, 35.8 by 33.2 ll. 



Comparison. — Calamospora pusilla is dis- 

 tinguished from other species of Calamospora 

 by its small size, numerous small folds, and 

 indistinct trilete rays. 



Derivation of name. — The name of the 

 species refers to its very small {pusilla) size, 

 which is distinctive. 



Calamospora sp. 1 

 Plate 1, figure 10 



The spores are radial, trilete, circular in 

 outline, and usually folded. The rays are 

 distinct and about three-fourths the length 

 of the radius. The surface of the spore coat 

 appears levigate when viewed under oil im- 

 mersion objective. The exine is about 1 ll 

 thick. Dimensions: size range about 28 to 

 35 ll in diameter. 



Figured specimen. — Negative 4748; Trivoli 

 Cyclothem, maceration 1128-1, slide 17, co- 

 ordinates, 123.4 X 40.7; size, largest speci- 

 men 32.7 ll in maximum diameter. This spe- 

 cies also was found in macerations 1128-H 

 and 1128-J. 



Genus Cirratriradites Wilson & 



Coe, 1940 



Table 1 



Type species. — Cirratriradites maculatus 

 Wilson & Coe, 1940. 



Affinity. — Probably herbaceous lycopods. 

 Microspores of the Cirratriradites type have 

 been described from a Selaginella from the 

 Rhaetic by Lundblad (1950, p. 477-486). 

 Spores from Selaginellites suissai Zeiller, 1906 

 (Chaloner, 1954, p. 81-87) and S. crassicinc- 

 tus Hoskins & Abbott ( 1956, p. 36) , also were 

 found to agree closely with Cirratriradites. 



Genus Colu minis porites gen. nov. 

 Plate 1, figures 11-14; text figure 3 



Type species. — Columinis porites ovalis sp. 

 nov. 



Diagnosis. — The generic name Columini- 

 sporites is proposed for small spores having 

 the following characteristics. The spores are 

 bilateral and bean shaped to elliptical in out- 

 line. They are probably monolete, but no 

 specimens have been found that show a defi- 

 nite monolete suture. The spore is covered 

 on all surfaces with three to many elevated, 

 anastomosing, and branching ridges, 2 to 3 ll 

 wide, that run more or less parallel to the 



