ONYCHIOPSIS. 59 



Although not included under the present species, 0. elongata, 

 there is a plant which must be briefly alluded to as an example of 

 the same genus, and probably very closely allied to Geyler's species. 

 In 1888 Yelenovsky contributed an important communication, 

 apparently overlooked by some recent writers, on ' ' Die Fame 

 der bohmischen Kreideformation"; he includes in his list of 

 Cenomanian ferns from the Perucer beds a new species, Thyrso- 

 pteris capsulifera, 1 and compares it to T. Maakiana, Heer, and 

 especially to 0. elongata (Geyler). Several figures are given 

 both of sterile and fertile pinnae, and the figure of the fertile 

 axis, pi. i. fig. 10, represents what is obviously the same type 

 of fertile pinna as Geyler's pi. xxxi. fig. 5 and PI. III. Figs. 2-4 

 of this Catalogue. Possibly the differences which are shown in 

 the figures by Yelenovsky, Geyler, and Yokoyama, between 

 T. capsulifera and T. elongata, are hardly of sufficient importance 

 to render a second specific name necessary ; the chief divergence 

 being the greater breadth of the ultimate segments in most of 

 the Bohemian specimens. 



Nathorst, 2 in calling attention to this paper by Yelenovsky, 

 notes the fact that the species T. eapsulifera possesses fructification 

 exactly like that of 0. elongata, and must, therefore, be included 

 in the same genus. 



In looking through the English Wealden material it has often 

 been difficult to decide the limits to assign to the two species 

 0. Mantdli and 0. elongata ; the coarser forms of the former come 

 very near to the latter species. 



So far, however, I have included only one specimen in this 

 species. It is not impossible that we may eventually have to 

 include even those forms with larger and broader pinnules in the 

 species 0. Mantelli ; for the present, at least, there seem to be 

 good reasons for referring such specimens as the one figured, 

 PL II. Fig 2, to Geyler's species. 



V. 2371. PI. II. Fig. 2. 



In this Figure are represented the best of several fragments 

 which occur on the same piece of rock. On the same specimen 

 are some badly preserved fragments of Cladophlebis Dunkeri 

 (Schimp.). 



1 Abk. k. bohm. Ges. Wiss. vol. ii. 1888, p. 10. 



2 Denkschr. k. Ak. Wiss. math.-nat. Cl. vol. Ivii. p. 55. 



