MARYLAND GEOLOGICAL SURVEY 829 



of the genus remains unsettled. There is considerable resemblance to 

 Lesquereux's genus Aspidiophyttum and also to the European forms 

 referred to Zenker's genus Credneria, both of which are genera of unde- 

 termined botanical affinity. Lesquereux referred a number of Dakota 

 group species to this genus, which may possibly be regarded as a synthetic 

 type. 



Occurrence. RARITAN FORMATLON. Shannon Hill and Bull Moun- 

 tain, Cecil County, Maryland; East Washington Heights, District of 

 Columbia. 



Collections. Maryland Geological Survey, U. S. National Museum, 

 X. Y. Botanical Garden. 



PROTOPHYLLUM MULTINERVE Lesquereux 

 Plate LXIII, Fig. 3; Plate LXIV, Figs. 1, 2 



Pterospermites multinervis Lesquereux, 1872, Ann. Kept. U. S. Geol. Sur- 

 vey, Terr. (Hayden) for 1871, p. 302. 



Protophyllum multinerve Lesquereux, 1874, Cret. Fl., p. 105, pi. xviii, fig. 1. 



Protophyllum multinerve Lesquereux, 1892, Mon. U. S. Geol. Survey, vol. 

 xvii, p. 191, pi. xliii, fig. 2 ; pi. Ixv, fig. 1. 



Protophyllum multinerve Berry, 1911, Bull. Torrey Bot. Club, vol. xxxviii, 

 p. 411. 



Description. Leaf of medium size, averaging considerably smaller 

 than the preceding species and more nearly orbicular in outline, 9 cm. to 

 15 cm. in length by 9 cm. to 13 cm. in maximum width, which is about 

 midway between the apex and the base. Apex rounded or obtusely pointed. 

 Base rounded truncate, subpeltate. Margin entire or regularly undulate, 

 usually constricted at the end of each secondary and branch of a secon- 

 dary, with usually two slight, rounded undulations between adjacent con- 

 strictions. Midrib stout, becoming thin above. Secondaries relatively 

 thin, numerous, craspedodrome, sending off from one to three craspedo- 

 drome branches. Tertiaries very numerous, thin, mostly transverse. 

 Texture coriaceous. 



This species has hitherto been known only from the Dakota sandstone 

 of southern Kansas, from which area it was described by Professor Les- 

 quereux in 1871. It is rather common in the Earitan clays at Cedar Point, 



