46 



Figured specimen. — Negative 4868; Trivoli 

 Cyclothem, maceration 1128-G, slide 15, co- 

 ordinates, 137.5 X 42.8; size, 33.7 by 32.4 /x. 



Spore N 

 Plate 8, figure 12 



The spore is radial, trilete, and triangular 

 in outline. The rays are distinct and extend 

 at least three-fourths the length of the spore 

 radius. Prominent triradiate ridges, about 2 /x 

 wide on either side of the commissure, ex- 

 tend to the margin of the spore coat. As 

 viewed under oil immersion objective, the 

 surface of the spore coat is levigate. The 

 exine is about 2 tt thick. 



Figured specimen. — Negative 5953; Trivoli 

 Cyclothem, maceration 1175-C, slide 25, co- 

 ordinates, 130.9 x 38.7; size, 65.2 by 53.0 /x. 



DESCRIPTION OF LARGE 

 SPORES AND MEGASPORES 



Genus Monoletes (Ibrahim) Schopf, 

 Wilson, & Bentall, 1944 



Type species. — Monoletes ovatus Schopf, 

 1938. 



Affinities. — Pteridospermic, Medullosaceae 

 (Schopf, Wilson, and Bentall, 1944, p. 38). 



Genus Spencerisporites Chaloner, 1951 

 Table 1 



Type species. — Spencerisporites karczewskii 

 (Zerndt) Chaloner, 1951. 



Affinity. — Lycopodian. Chaloner (1951, p. 

 861-873) obtained Spencerisporites from the 

 lycopod cone, Spencerites insignis Scott, 1898. 

 Spores found in a sporangium, assigned to 

 Spencerites, were correlated by Leisman 

 (1962a and b) to Spencerisporites gracilis 

 (Zerndt) Winslow, 1959. 



Genus Triletes (Bennie & Kidston) 



Zerndt, 1930 



Table 1 



Type species. — Triletes glabratus Zerndt, 

 1930. 



Affinities. — Free-sporing lycopsids (Schopf, 

 Wilson, and Bentall, 1944, p. 19). Lundblad 



recorded megaspores of the Triletes type 

 from a strobilus of a Selaginella-like plant 

 from the Triassic of Greenland (1948, p. 

 356-357) and Selaginella from the Rhaetic 

 of East Greenland (1950, p. 480-482). 

 Chaloner obtained megaspores comparable 

 to T. auritus Zerndt, 1930, from Lepido- 

 strobus zea Chaloner (1953b, p. 102-104) 

 and megaspores (Chaloner, 1954, p. 81-87) 

 similar to T. triangulatus Zerndt, 1930, from 

 the herbaceous lycopod Selaginellites suissei 

 Zeiller, 1906. Four other species of Triletes 

 were correlated with megaspores obtained 

 from four species of Lepidostrobus (Chaloner, 

 1953a, p. 263-293). Felix (1954, p. 351-394) 

 also correlated a number of species of Tri- 

 letes with various species of Lepidostrobus. 

 The megaspores of S. crassicinctus Hoskins 

 & Abbott, 1956, were compared with those 

 described as T. triangulatus. Sen (1958, p. 

 160-161) also reported T. triangulatus from 

 L. variabilis Lindley & Hutton, and T. ma- 

 millarius Bartlett from Sigillariostrobus gold- 

 enbergi Feistmantel. T. glabratus Zerndt, 

 1930, from Sigillariostrobus leiosporous, and 

 T. auritus from Lepidostrobopsis missouri- 

 ensis were described by Abbott (1963, p. 96- 

 100) . Many other investigations have dem- 

 onstrated the affinities of Triletes to lycopods. 



DESCRIPTION OF 

 OTHER MICROFOSSILS 



HYSTRICHOSPHAERIDEA 



Only four specimens representing three 

 types of hystrichospheres, all from one sam- 

 ple, were observed in this investigation. 



Hystrichosphere 1 

 Plate 8, figure 13 



The body is triangular and has four ap- 

 pendages about 15 fi long. The ends are 

 probably broken off. 



Figured specimen. — Negative 4770; Trivoli 

 Cyclothem, maceration 1128-J, slide 16, co- 

 ordinates, 128.4 x 38.3; body size 25.6 by 

 24.0 [i. 



Hystrichosphere 2 

 Plate 8, figure 14 



The body is elliptical, folded, and has at 

 least eight appendages, the largest 22.8 ju 



