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INTRODUCTORY. 



diate in size between the Cycadellas and such Black Hills species as Cycadeoidea 

 dacotensis. (See illustrations on plate VI.) The largest specimens from Maryland 

 do not exceed 50 cm. in height, but are mostly of robust habit, as in figure 7. One 



Fig. 7. — Cycadeoidea Goucheriana Ward (type). 

 An unbranched silicified trunk from the iron-ore beds of the Potomac Formation of Maryland. Many very young 

 fructifications are present, as disclosed by the broken tips of grouped bracts, but fruit growth is in an earlier stage than 

 in Cycadeoidea marylandica type, as shown in figure I, and the leaf-base spirals but little disturbed by the emergence 

 of the young and small strobili. Weight of specimen about 100 pounds. Collection of Woman's College of Bald- 

 more. (From U. S. Geological Survey Monograph XLV1II.) 



species, C. Uhleri, suggests a more columnar form, and, as already noted, bears a 

 striking resemblance to the Italian C. Masseuina. But the other Italian cycads are 

 also much like the usual Maryland type, the resemblance between the two groups 

 being marked. 



