544 CYCADOPHYTAN PEONDS [CH. 



Otozamites Klipsteinii (Dunker). 



This Wealden species, first described by Dunker as Cyclopteris 

 Klipsteinii^, is remarkable for the large pinnae. The rachis is 

 fairly stout ; the broadly oval or oblong pinnae vary considerably 

 in size and in the relation of breadth to length, in rare cases 

 reaching a length of over 8 cm. and a breadth of 2-4 cm. ; apex 

 obtuse, base slightly auriculate and asymmetrical ; veins numerous, 

 radiating from the point of attachment to the margin of the 

 lamina. The occurrence of finer lines between the more prominent 

 veins may indicate the presence of hypodermal stereome strands. 

 Fig. 608 illustrates the striking variation in the size of the pinnae 

 on a single frond and their attachment to the upper face of the 

 rachis. In the breadth of the segments 0. Klipsteinii resembles 

 0. Beani (Lind. and Hutt.), 0. decorus Sap.^, 0. lagotis Brongn.' 

 and two species from South Russia described by Thomas* as 

 0. Izuimensis and 0. giganteus. The pinnae of 0. giganteus 

 exceed 10 cm. in length and 3 cm. in breadth, thus surpassing 

 the largest segments of 0. Klipsteinii. Some pinnae from the 

 Jurassic flora of Oregon made by Fontaine the type of a new 

 species, 0. oregonensis^, may be fragments of 0. Klipsteinii. 

 Nathorst® records the occurrence in Lower Cretaceous or Wealden 

 beds in Spitzbergen of Cycadean leaflets very like those of 0. 

 Klipsteinii. 



Otozamites Goeppertianus (Dunker). 



This Wealden species, named by Dunker'' Pterophyllum 

 Goeppertianum, agrees in habit with some of those to which 

 reference is made under 0. Bechei, e.g. 0. linearis Halle, and 

 represents a type of the genus with unusually narrow pinnae 

 (fig. 603, A). The auriculate form of the lamina is feebly developed ; 

 the linear-lanceolate pinnae are occasionally falcate and have 

 acute apices; as in many other species they were apparently 

 deciduous. It is by no means easy to distinguish some of these 

 fronds from specimens included in Ptilophyllum pecten. 



' Dunker (46) A. p. 11, PI. ix. figs. 6, 7; Seward (95) A. p. 60. 

 '' Saporta (75) A. Pis. ex., cxi. ' Ibid. PI. ex. 



4 Thomas (11) p. 83, Pis. v., vi. 



5 Eontaine in Ward (05) B. PL xxxviii. « Nathorst (13) p. 279. 

 ' Dunker (46) A. p. 14, PI. ii. fig. 5; Seward (95) A. p. 70, PI. i. 



