118 DIElERlriN^. 



straight and sliglitly lobed ; those nearer the distal end of the- 

 pinnae are entire, more inclined to the pinna axis, and more 

 acutely pointed. 

 Upper Shale, Scarborough. £eem ColL 



39,239. PL XVI. Figs. 3 and 3a. 



This specimen serves as an example illustrating the close- 

 agreement between portions of a frond of Coniopteris arguta and 

 Klukia exilis. Cf. the drawing of Pecopteris aeutifolia given by 

 Lindley & Hutton {Fossil Flora, pi. cl-vii.). 



V. 3677. Text-fig. 16. 



Portions of t-svo of the best fertile pinnae are sho-wn in the- 

 dra-wing. The fertile segments are about 4 mm. in length, and 

 the indusial cup, -with a small central receptacle, has a diameter 

 of 1 mm. Cf . Aspleniopteris pinnatifiia, Font.^ 



39,255. Labelled by Bean Muropteris arguta. This example- 

 is probably part of a large pinna ; it agrees closely -with the 

 specimen figured by Lindley & Hutton as Sphenopteris serrata, 

 and forms a connecting link between the fronds -with smaller- 

 pinnules and those with larger ultimate segments. 



Scarborough. Bean Coll.. 



Other specimens :— V. 2632, V. 3932, V. 3941, 13,487, 13,493,, 

 39,232, 39,260, 40,467. 



Family DIPTERIDIN^. 



This family name is employed to indicate the probable close- 

 relationship between the recent genus Dipteris and such fossil 

 genera as DiotyopJiyllum and Frotorhipis, and to give expression to. 

 the deviation of these ferns from the typical Polypodiacese. 



' Fontaine (89), pi. xxv. fig. 6. 



