36 ILLINOIS STATE GEOLOGICAL SURVEY CIRCULAR 500 



Samaropsis sp. B 

 Text fig. 12C; pi. lk 9 figs. 1, 2 



Only a single -well-preserved specimen of this form has been found 

 in the Spencer Farm Flora; two poorly preserved specimens are similar 

 enough to be included. The nucellus is heart shaped and large (20 mm 

 vide and 25 mm high). The sclerotesta and sarcotesta have elongated 

 apices, the sarcotesta being pear shaped. In size and some other as- 

 pects, notably the lack of residue or relief, these resemble Cardiocar- 

 pon phillipsii Read (19^6, p. 22, pi. 2, figs. 1-3). However, Read des- 

 cribed the wing of C. phillipsii as having a distinct V-shaped slit ex- 

 tending to the apex of the nucellus. Read also stated that the wing 

 measures only 0.5 cm at the micropylar end; on our specimen, however, the 

 sarcotesta is more than 1 cm wide at the apex. Lesquereux (l88U) also 

 described and figured a very large, elongate form, Carpolithes perpusillus 

 (pi. 110, fig. 22-2U). The variation within his figures and incomplete 

 preservation of our specimens do not permit further comparison. 



Samaropsis sp. C 

 Text fig. 12D; pi. lk 9 fig. 3 



This group is represented by two relatively small oval seeds 

 and the outline of a third. The nucellus is almost completely circular, 

 the apex being only slightly pointed. The overall form is circular, 

 the sarcotesta being 2 to 3 mm wide all around the seed except for pos- 

 sibly a broad V-shaped incision at the apex. 



These seeds bear strong resemblance to Cardiocarpon annulatum 

 Newberry, Cardiocarpus diverges Lesquereux, and C. patens Lesquereux. 

 The differences between these are minor variations in the form of the 

 wing at the base and/or apex, differences that may be the result of pre- 

 servation. 



Cordaicarpus sp. A 

 Text fig. 12E; pi. 15, figs. 3, h 



Two specimens are preserved which show an ovate nucellus with a 

 small point at the apex and a slightly cordate base, a sclerotesta (?) 

 closely fitting at the base of the nucellus but extending considerably 

 above the nucellus, and a narrow sarcotesta (?) around the entire body. 

 The "wing" is not considered wide enough to warrant placing the seed in 

 the genus Samaropsis . The overall form is elongated oval except for the 

 slight indentation at the base. The best specimen shows much relief, 

 but where the specimen is broken, it consists of a very thin film and 

 thus the relationship of the present form to the original shape is un- 

 known. 



Cordaicarpus sp. B 

 Text fig. 12F; pi. 15, figs. 8, 9 



This group includes seeds with a small (5 x 5 mm) heart-shaped 

 nucellus and a slightly larger cordate to tear-drop-shaped sclerotesta, 



