COXIOPTERIS. 



117 



linear pinnules. The "Wealden ferns described under the names 

 C. Browniana (Dunk.) and C. Dunkeri (Schimp.) l are of this 

 type, also the specimens described by Yokoyama 2 from Japan as 

 Pecopteris exilis and the specimen from Steierdorf named by 

 Andrae Cyatheites decurrens. 3 



FIG. IQ.Coniopteris arguta (L. & H.). (No. V. 3677.) 



The form of the fertile segments, especially the cup -shaped 

 indusium, leads me to include Coniopteris arguta in the Cyatheaceae. 

 In Text-fig. 16 the fertile segments are clearly shown, twice 

 natural size ; they suggest a comparison with Thyrsopteris and 

 other members of the Cyatheaceae, and are somewhat similar to 

 those of Nephrolepis davallioides, Swartz.* The single fertile 

 segment, enlarged four times, shows the single Thyrsopteris-lfcc 

 indusium with the small central umbo or receptacle. 



39,232. PI. XVII. Figs. 4 and 5. 



This specimen, of which a portion is represented in Fig. 4, 

 shows parts of nine pinna? attached to the rachis ; the longest 

 of which measures about 9 cm. The larger pinnules (Fig. 5) are 



1 Seward (94 1 ), pi. vii. 

 1 Yokoyama (89), pi. i. 

 3 Andrae (53), pi. vii. fi 

 * Christ (97), p. 290. 



r. 4. 



