PRE-CARBONIFEROUS PLANTS. 



55 



88. Alethopteris inqens, Dn.— (PI. XVIII, Fig. 206.)— lb.— M.D., 



St. John, New Brunswick. 



" Pinnules more than an inch wide, and three inches or more in length, 

 with nervures at right angles to the midrib and forking twice. 



89. Alethopteris Perlbyi, Hartt.— Acad. Geol. p. 552. — M. D., St. 

 John, New Brunswick. 



" Allied to A. aerrula, Lesq., but pinnae wider and closer and not so 

 long or so much united ; usually tridentate ; teeth acuminate, middle 

 one sometimes emarginate; vein three-forked, sending a veinlet 

 into each lacinia. The middle veinlet branches in the middle 

 lacinia." 



Genus Pecopteris — Brong. 



90. Pecopteris (Aspidites ?) 'serrdlata, Hartt. — (PI. XVIII, Figs. 

 207 to 209.)— Acad. Geol. p. 553, Fig. 92.— M. D.,St. John, New 

 Brunswick. 



" Tripinnate ; pinnae short, alternate, close or open,lanceolate, very oblique, 

 situated on a rather slender rounded subflexuose 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 pinna, 

 decreasing thence gradually to the apex; terminal pinnule elon- 

 gated. Median nerve entering the pinnule very obliquely, flexuous, 

 running to the apex. Nervules very few, oblique, simple, and 

 somewhat rarely forking at the margin." 



Numerous additional specimens of this species confirm Prof. Hartt's 

 determination of its distinctness from P. pluinosa, Brongt. It perhaps more 

 strongly resembles Goeppert's P. Silesiaoa ; but this last has broader and 

 more closely arranged pinnules decurrent on the petiole. It may be taken as 

 a Devonian representative of the deUcate 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 

 Aletliopteris serrula. 



