104 THE CANADIAN NATURALIST. [Yol. X. 



It is farther to be observed that this fern occurs with a group 

 of species which I have shown to be distinct not only from those 

 of the Coal Formation but from those of the Millstone Grit and 

 those of the Lower Carboniferous Coal-measures or Horton series 

 (sub-Carboniferous of some American geologists), which sub- 

 floras are well developed in the Acadian provinces, and overlie 

 stratigraphically the beds holding the fern which is the subject 

 of this note and its associated fossils, 



I may add here Hartt's description of the plant and my note 

 on it, from my Report of 1870 : — 



'^Pecopteris (Aspidites ?; serrulata, Hartt. — (PI. XVIII, 

 Figs. 207 to 209.)— Acad. Geol. p. 553, Fig. 92.— M.D., 

 St. John, New Brunswiek." 



'• Tripinnate ; pinna short, alternate, close or open, lanceolate, 

 very oblique, situated on a rather slender, rounded, sub- 

 flexuose rachis ; pinnules small, linear lanceolate, crenulate, 

 revolute, moderately acute, oblique, sessile, decurrent, widest 

 at the base, open, separated from one another by a space 

 equal to the width of a pinnule, slightly arched towards the 

 point of pinna ; longest at base of pinn:i, decreasing thence 

 gradually to the apex ; terminal pinnule elongated. Median 

 nerve entering the pinnule very obliquely, flexuous, running 

 to the apex, Nervule's very few, oblique, simple, and some- 

 what rarely forking at the margin." 



"Numerous additional specimens of this species confirm Prof. 

 Hartt's determination of its distinctness from P.j^Iumosa, Brongt. 

 It perhaps more strongly resembles Goeppert's P. Silesiaca ; but 

 this last has broader nnd more closely arranged pinnules decur- 

 rent on the petiole. It may be taken as a Devonian representa- 

 tive of the delicate Pecopterids of which the species above named 

 are Carboniferous types. Mr, Hartt's specimens enable me to 

 represent its habit of growth. Schimper quotes under this name 

 a Carboniferous species of Lesquereux. But Lesquereux's species 

 is AIetho2:)feris serrula.^' (This was subsequently corrected by 

 Schimper in the Supplement to his Palaeontologie Vegetale.) 



