FOX HILLS AND LOWER MEDICINE BOW 63 



recently found this spccies in the Colgate formation of eastern Montana. I havc con:iparcd the 

 Medicine Bow specimens with botii tiie original typc specimens and the Colgate specimcns and 

 find them all alike in essential characteristics. 



The reference to the genus Magnolia may be correct, though as yet unsubstantiated by asso- 

 ciated seeds, flowers, or wood. I have seen no modern leaves closely resembUug these specimens. 



Occurrence — Elk Mountain road, Wyoming, Loc. P. 374. 



Collection—U . C. Mus. Pal., Plesiotype No. 1340. 



Magnolia dakotana Berry 

 (Plate 10, Fig. 3) 

 Magnolia dakotana Berry, U. S. Geol. Surv. Prof. Paper 185-F, 130, pl. 25, figs. 6, 7, 1934. 



There are 6 specimens of this type, of which the best is figured. Except for the slight ab- 

 normahty in the basal venation of the figured type, it is difficult to cUfferentiate between the Lance 

 and Medicine Bow specimens. Despite the well-defined characters of this species, there appear 

 to be no other fossil forms with which a comparison can be made. Berry's reference to the genus 

 Magnolia was made with some hesitation. At present it seems desirable to retain it there pending 

 further studies. 



Occurrence — North of Walcott, Wyoming, Loc. P. 373; TCorson Ranch, Wyoming, Loc. 

 P. 371. 



Collection^V. C. Mus. Pal., Plesiotype No. 1341. 



Magnolia nervosa (Knowlton) Brown 



(Plate 10, Fig. 4) 



Mag-nolia ncrvosa (ICnowlton) Brown, U. S. Genl. Surv. Prof. Paper, manuscript, 1937. 

 Pterospermites nervosns Ivnowlton, U. S. Geol. Surv. Prof. Paper 101, 273, pl. 48, fig. 4, 1917. 



This type of leaf is rare in the Medicine Bow coUections, being represented only by a few 

 fragments and the single fairly complete leaf figured. This specimen is identical with those from 

 the Colgate and lower Lance formations of eastern Montana which are in the collections of the 

 U. S. National Museum. Brown has referred these to Magnolia yiervosa, with which he has syn- 

 onymized the specimen of Pterospermites nervosus from the Vermejo formation. 



Occurrence — Elk Mountain road, Wyoming, Loc. P. 374. 



Collection—\] . C. Mus. Pal., Plesiotype No. 1342. 



Magnolia pulchra Ward 



(Plate 11, Fig. 8) 



Magnolia pulchra Ward, U. S. Geol. Surv., 6th Ann. Rept., 556, pl. 60, figs. 2, 3, 1886; idem, Bull. 37, 103, 

 pl. 48, figs. 3, 4, 1887. 



This species is represented only by several fragmentary leaves and the nearly complete 

 specimen figured. It is identical in all respects with the type and figured specimen of Magnolia 

 pulchra, except possibly for the tip, which is turned under in the Medicine Bow specimen but ap- 

 pears to be slightly more obtuse. The obovate shape and thin secondaries clearly distinguish this 

 species from the others referred to the same genus. 



The original specimens of this species are from the' Mesaverde formation. Berry has recently 

 reported it from the upper Ravenscrag (Fort Union) of southern Saskatchewan.^ I have not 

 been able to see his specimens for comparison, so cannot comment on their relationship to the 

 late Cretaceous specimens. 



The generic reference to Magnolia seems reasonable. I have noted also a resemblance of the 

 specimens to the leaves of Asimina triloha Dunal (Anonaceje), which are identical in shape and 

 size and differ onJy slightly in their more regular secondary veins. 



Occurrence — Corson Ranch, Wyoming, Loc. P. 371; Elk Mountain road, Wyoming, Loc. 

 P. 374. 



Collection—V. C. Mus. Pal., Plesiotype No. 1343. 



1 Berry, E. W., Canada Geol. Surv. Mem. 1S2, 35, 1935. 



