WEICHSELIA. 119 
is proposed for a plant previously described by Geinitz as an 
example of Cladophlebis nebbensis (Brong.). In discussing this species 
Nathorst refers to the characteristic position of the pinnules, and 
speaks of them as inclined to one another like the wings of a 
resting butterfly; it is suggested that possibly this inclination of 
the pinnules towards the secondary rachis may be an adaptation 
for leading off the rain-water. After noting the reticulated nature 
of the venation, he suggests the advisability of retaining the 
genus Werchselia for the Lower Cretaceous form of Lonchopteris, 
the latter name being retained for such species as occur in the 
Coal-Measures.!. One of the ‘‘fertile pinne or pinnules”’ figured 
by Nathorst in another paper as Pecopteris Geyleriana, Nath., 
I venture to include under Werchselia Mantelli as a terminal 
fragment of a pinna. Nathorst also notes this resemblance.” 
There is certainly, as Brongniart recognized, a distinct difference 
between such species as Lonchopteris Brictt, etc.,> and L. Mantelli,* 
the former having the same habit as the genus Alethopteris, but 
differing in the reticulate venation. 
To emphasize the distinctive characters of the Wealden species, 
I have retained Stiehler’s generie name in preference to Brong- 
niart’s genus Lonchopteris. 
The form Lonchopteris virginiensis, Font.,° from the older 
Mesozoic strata of Virginia, should be retained in its present 
genus, as its affinities seem to be rather with the Paleozoic 
Lonchopteris than with the Lower Cretaceous Wetchselia. Stur 
considers Fontaine’s species to be the same as Spesrocarpus 
Haberfelnert, Stur, from the Lunz beds.® 
V. 2630. Pl. X. Fig. 3, and Woodcut, Fig. 12, p. 120. Only a 
portion of the specimen shown in the Figure. 
This specimen is in striking contrast to the ordinary fragmentary 
specimens of the species obtained from English localities. Rachis 
18 cm. long, very broad and stout, pinne alternate, approximate, 
of considerable length, the longest 20 cm. The general habit of 
1 Arch. Ver. Freund. Nat. Mecklenb. Jahr. xliv, 1890, p. 20. 
2 Denkschr. k. Ak. Wiss. math.-nat. Cl. vol. lvii. 1890, p. 49. 
3 Hist. vég. foss. pl. exxxi. figs. 2 and 3. 
4 Thid. pl. exxvi. figs. 4-5. 
5 U.S. Geol. Surv. Mon. vi. 1883, p. 53, pl. xxviii. figs. 1-2; pl]. xxix. figs. 1-4. 
§ Verh. k.-k. geol. Reichs. No. 10, 1888, p. 7. 
