108 CONIOPTEEIS. 



Tympanophora racemosa. The lower pinnules, at the upper end 

 •of the drawing, are subdivided into fiye narrow lobes terminating 

 in compressed cup-shaped indusia, in which some of the individual 

 sporangia can be indistinctlY recognized. The lamina of the 

 fertile segments is rather further reduced than in 52,595 (Fig. 6). 

 Portions of sterile pinnules of the S. hymenophylloides type are 

 associated with this fertile pinna. Cf. Thyrsopteris Murray ana as 

 figured by Eaeiborski. The fertile segments present a striking 

 ;agieement with those of the recent fern Dichionia Bertervana, Hk., 

 shown in Text-fig. 13. 



Scarborough. Bean Coll. 



40,467. PI. XVII. Fig. 3. 



The pinna shown in Pig. 3 is drawn from a bipinnate frond with 

 long acumuiate pinnae, bearing obliquely placed, narrow-pointed 

 segments of the same form as those of Brongniart's Sphenopteris 

 hymenophylloides and 52,595 (PL XVI. Figs. 6 and 7), but 

 ■of smaller dimensions. This specimen appears to be specifically 

 identical with Seer's Siberian examples of Thyrsopteru Maakiana, 

 Heer, and with the "Whitby specimen shown in PI. XX. Fig. 1 ; 

 it affords a good example of the smaller type of frond of the same 

 habit as the larger and more abundant specimens of S. hymeno- 

 phylloides. A specimen, identical with this, in the Leckenby 

 Collection is labelled by Nathorst Thyrsopteris Maakiana, Heer. 



Scarborough. 



PI. XX. Figs. 1 and 2. Xo. 2373, 'WhitbT Museum ; labelled 

 Sphenopteris dissocialis, Phill. 



This is an important specimen as affording evidence of the specific 

 identity of the fronds with shorter pinnules and more rounded or 

 truncate divisions, and those of the form represented in Brongniart's 

 figure of S. hymenophylloides. It affords additional evidence, in 

 fact, in favour of regarding such pinnae as those shown in PI. XVI. 

 Fig. 6 and PI. XXI. Fig. 2 as identical with the type shown in 

 PI. XVI. Figs. 4 and 5 and PI. XXI. Figs. 1 and 4. The two 

 fronds, portions of which are drawn in Figs. 1 and 2, PL XX., 

 occur close to one another on the same piece of rock, and fragments 

 of pinnae with shorter and more rounded segments, and others 

 with the more pointed segments, occur indiscriminately associated 

 together. There is also one fertile pinna like that of Figs. 6 and 8, 



