Megal. 



386 



Megalopteris {Neuropteris) dawsoni. Hartt. Acadian Ge- 

 ology, 1868, page 

 550, figure 193, 



" mid-rib not accu- 

 rately given in the 

 figure;" a^ frag- 

 ment of pinna ; J, 

 point of pinnacle ; 

 ,(?, mode of vena- 

 ;t i o n . — Devonian 

 'in New Brunswick. 

 — VI I I- IX. 



This remarkable 

 fern, says Sir Wil- 

 liam Dawson, dis- 

 covered by Mr. 

 Hartt at St. John, 

 N. Brunswick, Can- 

 ada, presents curi- 

 ous points of afiin- 

 ity to Cyclopterids, 

 and may, when 

 more fully known, 

 be placed in a dis- 

 tinct genus. The 

 pinnae, particu- 

 larly when the 

 midribs are thick, 

 show a strong tend- 

 ency to split up in 

 a direction to the 

 rachis. (Sic). I 

 have sometimes 

 noticed them 

 folded in a condu- 

 plicated manner. 

 The nerves fork twice, or thrice. (Hartt.) 



Megalopteris hartii, Andrews. See Appendix. 



Megalopteris lata, Andrews. See Appendix. 



