EXPLANATION OF THE ILLUSTRATION 
Crossorueca saairtata ( Lesquereur) Sellards 
Upper figure: A small specimen from Mazon Creek, 
Illinois. Natural size. Harvard Botanical Museum 
(Paleobotany) No. 9748 (F.O.Thompson Collec- 
tion). 
P . “é . 
Middle figure: ‘spores,’* somewhat collapsed, 
taken from the specimen shown in the upper fig- 
ure. Photograph of a nitrocellulose peel. Magni- 
fied 75 times. 
Lower figure: Photograph of a nitrocellulose peel 
showing a cluster of sporangia with the typical 
epaulette shape. T'wice natural size. Mazon Creek, 
Illinois. Peeled from specimen No, 12192 Har- 
vard Botanical Museum (Paleobotany). (Lesque- 
reux Collection). 
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